BACKFLOW CURRENT CONTROL UNIT (BCCU): The backflow current control unit was mention from the previous steps in detail ; Q1 is a reverse blocking, high-side N-channel MOSFET that provides a controllable blocking effect from Q2's body diode current leakage. Series RLC Circuit Impedance Calculator. The output voltage may be set at any level greater than 2.5 V (V REF) up to 36 V merely by selecting two external resistors that act as a voltage divided network.Due to the sharp turnon characteristics this device is an excellent replacement for A 4.7V Zener Diode (1N4732A) is used for this purpose. Battery Energy and Runtime Calculator . This is because the current flowing through the first resistor has one path through each of the following resistors in the chain. The manufacturers make sure the resistors are of the right value and in the right position so that the LEDs on the strips will be less prone to the variation of the voltage source as we talked of with the XP-G2. Third Resistance R = 15 . A CRT on a television set is commonly called a picture tube. For the protection or limiting the current we simply use a resistor in series with it. The LED calculator was great for single LEDs--but when you have several, the wizard will help you arrange them in a series or combined series/parallel configuration. Coaxial Cable Calculator. Coaxial Cable Calculator. ERW = (Sv Vd)*(Dc/1000). Note that this method is not recommended for high current LEDs, which need a more reliable switching current regulator. Battery Energy and Runtime Calculator . Overload protection remains functional even if the ADJUST terminal is disconnected. For instance, in the example I just gave there's a 5V supply and 2 LEDs with a 2.4V Forward Voltage Drop each. California voters have now received their mail ballots, and the November 8 general election has entered its final stage. A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. Economy Step Down. Battery Energy and Runtime Calculator . This LED resistor calculator will help you to pick up a right value of resistor for the LED in your LED circuit , you just have to input the values of Source voltage (V s ), LED forward current (I f ) and Led forward voltage (V f ). The calculation also determines how much power the LED consumes. After designing the "Clock Set Date Time" and hearing the suggestion of ArduPic, I thought it would be a good idea and also useful, add a "wake-up alarm. Series RLC Circuit Impedance Calculator. NFC/RFID Planar Spiral Coil Inductance Calculator. First resitor resistance R = 4 . how much is csrs death benefit. The code you write is called a sketch. R37 is a pulldown resistor to bleed out the gate charge of Q1 when the BCCU is turned off. Drone LiPo Battery Calculator. R37 is a pulldown resistor to bleed out the gate charge of Q1 when the BCCU is turned off. The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. Mathematically, the flow of current through the LED can be written as. A current limiting resistor, sometimes called a load resistor, or series resistor, connects in series with a light emitting diode (LED) so that there is a correct forward voltage drop across it. Before the Zener Diode, we have connected a series resistor of 22K (5W) for limiting the current. This calculator will help you determine the value of the resistor to add in series with the LEDs to limit the current. Second resistance R = 10 . In the case of driver 1 (for Q1) there is a low pass RC filter in series, with a time constant of about 1 ms. Driver 2 is driven directly (as in the current circuit, but probably with a slightly higher series resistor to allow more current for the Q1 driver and its RC filter). Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. GO TO CALCULATOR. Coaxial Cable Calculator. Battery Energy and Runtime Calculator . This LED calculator will help you design your LED array and choose the best current limiting resistors values. To get started, input the required fields below and hit the "Design Circuit". The LED calculator was great for single LEDs--but when you have several, the wizard will help you arrange them in a series or combined series/parallel configuration. LED Resistor Calculator. Before the Zener Diode, we have connected a series resistor of 22K (5W) for limiting the current. Thank you Fremin, actually if you use the first circuit with a proper limiting resistor, then the series resistor with the LED can be avoided. Economy Step Down. In driver chip 3, IN is driven by D9 and SD is driven by D10. The RAMPS 1.4 offers no pull-up circuits, current limiting resistors or other protections. For regulating the DC output of the Bridge Rectifier, we are using a Zener Diode. Arduino Project 1: Blinking an LED - Basics. The circuit consists of a power supply (the Raspberry Pi), an LED that lights when the power is applied, and a resistor to limit the current that can flow through the circuit. The images may represent electrical waveforms (oscilloscope), pictures (television set, computer monitor), radar targets, or other phenomena. Overload protection remains functional even if the ADJUST terminal is disconnected. Calculation of Current-Limiting Resistors for a Single LED and LED Arrays. You need a step down transformer. A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The wizard determines the current limiting resistor value for each portion of the array and calculates power consumed. A current limiting resistor, sometimes called a load resistor, or series resistor, connects in series with a light emitting diode (LED) so that there is a correct forward voltage drop across it. MOS Technology, Inc. ("MOS" being short for Metal Oxide Semiconductor), later known as CSG (Commodore Semiconductor Group) and GMT Microelectronics, was a semiconductor design and fabrication company based in Audubon, Pennsylvania.It is most famous for its 6502 microprocessor and various designs for Commodore International's range of home computers The images may represent electrical waveforms (oscilloscope), pictures (television set, computer monitor), radar targets, or other phenomena. If you are wondering, "What resistor should I use with my LED? Series RLC Circuit Impedance Calculator. 5 = 4.8 + Resistor. Mathematically, the flow of current through the LED can be written as. For the protection or limiting the current we simply use a resistor in series with it. The regulated DC is given to the LED after filtering it out using 47F / 25V Capacitor. A current limiting resistor, sometimes called a load resistor, or series resistor, connects in series with a light emitting diode (LED) so that there is a correct forward voltage drop across it. Resistor = 5 - 4.8 Fourth Resistance R = 22 . A current limiting resistor regulates and reduces the current in a circuit. The most common LED strips are designed with a group of LEDs in series with a current-limiting resistor in line with them. Drone LiPo Battery Calculator. how much is csrs death benefit. LED Lighting; News; Contact; 0 Menu Close. About Our Coalition. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. After designing the "Clock Set Date Time" and hearing the suggestion of ArduPic, I thought it would be a good idea and also useful, add a "wake-up alarm. The wizard determines the current limiting resistor value for each portion of the array and calculates power consumed. It's easy: 5 (System Voltage) = 2.4 (LED 1) + 2.4 (LED 2) + Resistor. NFC/RFID Planar Spiral Coil Inductance Calculator. ERW = (Sv Vd)*(Dc/1000). Read More September 6, 2022 Trying to run your device / appliance in Australia? So this resistor plays a key role in protecting the LED. In this case, enter any two of the following values: the voltage across the resistor, the current through the resistor, or its resistance in ohms to find the power dissipation in watts. Before jumping to the code, I would like a show the basic structure of the Arduino code. BACKFLOW CURRENT CONTROL UNIT (BCCU): The backflow current control unit was mention from the previous steps in detail ; Q1 is a reverse blocking, high-side N-channel MOSFET that provides a controllable blocking effect from Q2's body diode current leakage. Before jumping to the code, I would like a show the basic structure of the Arduino code. In this project, you instruct an Arduino to Turn ON and TURN OFF an LED with a suitable delay. First resitor resistance R = 4 . The LED calculator was great for single LEDs--but when you have several, the wizard will help you arrange them in a series or combined series/parallel configuration. Coaxial Cable Calculator. Power supply voltage (V): LED Lighting; News; Contact; 0 Menu Close. In this case, enter any two of the following values: the voltage across the resistor, the current through the resistor, or its resistance in ohms to find the power dissipation in watts. Coaxial Cable Calculator. Single-Layer Coil Inductance Calculator. "A small change to the code and adding a few components: Here's "the Alarm Clock ".Compared to the previous project, I added a buzzer Piezzo, a diode LED, a resistor of 220 ohms, a button and as said before, I listened to Prop 30 is supported by a coalition including CalFire Firefighters, the American Lung Association, environmental organizations, electrical workers and businesses that want to improve Californias air quality by fighting and preventing wildfires and reducing air pollution from vehicles. Drone LiPo Battery Calculator. You will be using one of the ground (GND) pins to act like the negative or 0 volt ends of a battery. 0 $ 0.00. 150kv Partial Discharge Free Transformer with current limiting resistor. Coaxial Cable Calculator. NFC/RFID Planar Spiral Coil Inductance Calculator. ELR = (Sv Vd)/(Dc/1000). Drone LiPo Battery Calculator. In this project, you instruct an Arduino to Turn ON and TURN OFF an LED with a suitable delay. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.High-power resistors that can dissipate many watts of electrical power as heat may be After designing the "Clock Set Date Time" and hearing the suggestion of ArduPic, I thought it would be a good idea and also useful, add a "wake-up alarm. The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. For regulating the DC output of the Bridge Rectifier, we are using a Zener Diode. A current limiting resistor regulates and reduces the current in a circuit. If you are wondering, "What resistor should I use with my LED? In the case of our I2C pins, the rating listed in the datasheet is the V OL and the I OL. Coaxial Cable Calculator. "A small change to the code and adding a few components: Here's "the Alarm Clock ".Compared to the previous project, I added a buzzer Piezzo, a diode LED, a resistor of 220 ohms, a button and as said before, I listened to R37 is a pulldown resistor to bleed out the gate charge of Q1 when the BCCU is turned off. MOS Technology, Inc. ("MOS" being short for Metal Oxide Semiconductor), later known as CSG (Commodore Semiconductor Group) and GMT Microelectronics, was a semiconductor design and fabrication company based in Audubon, Pennsylvania.It is most famous for its 6502 microprocessor and various designs for Commodore International's range of home computers Single-Layer Coil Inductance Calculator. Single-Layer Coil Inductance Calculator. IF = Vs VD/Rs. Single-Layer Coil Inductance Calculator. Thus, limiting the current through the LED with the use of a series resistor is a common and simple practice. This calculator will help you determine the value of the resistor to add in series with the LEDs to limit the current. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. The output voltage may be set at any level greater than 2.5 V (V REF) up to 36 V merely by selecting two external resistors that act as a voltage divided network.Due to the sharp turnon characteristics this device is an excellent replacement for Single-Layer Coil Inductance Calculator. NFC/RFID Planar Spiral Coil Inductance Calculator. Thus, limiting the current through the LED with the use of a series resistor is a common and simple practice. The LED calculator will display the resistance value, draw a small schematic and show you the color code of the Where, IF is forward current Vs is a voltage source VD is the voltage drop across the light-emitting diode Rs is a current limiting resistor. Series RLC Circuit Impedance Calculator. Key Findings. ELR = (Sv Vd)/(Dc/1000). This calculator will help you determine the value of the resistor to add in series with the LEDs to limit the current. Single-Layer Coil Inductance Calculator. Single-Layer Coil Inductance Calculator. To get started, input the required fields below and hit the "Design Circuit". In the above figure, the circuit denoted as b explains the condition when the value of forward biased voltage is such that the voltage across the diode is almost 0.7 volts or potential barrier while the increment in value of forward current is very fast; As we continuously increase the forward-biased voltage-current also increases very fast with the forward-biased voltage, Battery Energy and Runtime Calculator . Prop 30 is supported by a coalition including CalFire Firefighters, the American Lung Association, environmental organizations, electrical workers and businesses that want to improve Californias air quality by fighting and preventing wildfires and reducing air pollution from vehicles. To get started, input the required fields below and hit the "Design Circuit". Calculate resistor value needed to drop excess voltage: excess voltage / led current = 6.2v / .025 amps = 248 ohm resistor (240 ohm is closest standard value) Calculate resistor watt value: (LED current)^2 * 240 ohms = .025 * .025 * 240 = .15 watts so a 1/2 watt resistor will have some breathing space. SP = (ERW*100/60) Example in the case of a single led, with a supply voltage of 20volts, at a drop across led of 5volts and a desired current of 12miliamps. Note that this method is not recommended for high current LEDs, which need a more reliable switching current regulator. LED series current limiting resistor calculator - useful when designing circuits with a single LED or series/parallel LED arrays - for both the common small-current (20mA) LEDs and the more expensive, high power LEDs with currents up to a few Amperes. In the above figure, the circuit denoted as b explains the condition when the value of forward biased voltage is such that the voltage across the diode is almost 0.7 volts or potential barrier while the increment in value of forward current is very fast; As we continuously increase the forward-biased voltage-current also increases very fast with the forward-biased voltage, Calculation of Current-Limiting Resistors for a Single LED and LED Arrays. A current limiting resistor regulates and reduces the current in a circuit. IF = Vs VD/Rs. SP = (ERW*100/60) Example in the case of a single led, with a supply voltage of 20volts, at a drop across led of 5volts and a desired current of 12miliamps. The manufacturers make sure the resistors are of the right value and in the right position so that the LEDs on the strips will be less prone to the variation of the voltage source as we talked of with the XP-G2. How would you find out the voltage across that resistor? LED Calculator. In driver chip 3, IN is driven by D9 and SD is driven by D10. Blinking an LED is the "Hello World" equivalent program. Where, IF is forward current Vs is a voltage source VD is the voltage drop across the light-emitting diode Rs is a current limiting resistor. 150kv Partial Discharge Free Transformer with current limiting resistor. Single led calculation. Note that this method is not recommended for high current LEDs, which need a more reliable switching current regulator. In this case, enter any two of the following values: the voltage across the resistor, the current through the resistor, or its resistance in ohms to find the power dissipation in watts. You will be using one of the ground (GND) pins to act like the negative or 0 volt ends of a battery. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.High-power resistors that can dissipate many watts of electrical power as heat may be California voters have now received their mail ballots, and the November 8 general election has entered its final stage. Read More September 6, 2022 In this project, you instruct an Arduino to Turn ON and TURN OFF an LED with a suitable delay. NFC/RFID Planar Spiral Coil Inductance Calculator. Battery Energy and Runtime Calculator . Series RLC Circuit Impedance Calculator. This equation and calculator helps determine the value of the resistor to add to a light-emitting diode (LED) so that it can limit the current moving through the LED. LED Calculator. Resistor = 5 - 4.8 Series RLC Circuit Impedance Calculator. It has current limiting, thermal overload protection, and safe operating area protection. The regulated DC is given to the LED after filtering it out using 47F / 25V Capacitor. Single led calculation. Calculation of Current-Limiting Resistors for a Single LED and LED Arrays. For instance, in the example I just gave there's a 5V supply and 2 LEDs with a 2.4V Forward Voltage Drop each. Trying to run your device / appliance in Australia? Overload protection remains functional even if the ADJUST terminal is disconnected. The LED calculator will display the resistance value, draw a small schematic and show you the color code of the This LED resistor calculator will help you to pick up a right value of resistor for the LED in your LED circuit , you just have to input the values of Source voltage (V s ), LED forward current (I f ) and Led forward voltage (V f ). The RAMPS 1.4 offers no pull-up circuits, current limiting resistors or other protections. Second resistance R = 10 . ELR = (Sv Vd)/(Dc/1000). A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. It's easy: 5 (System Voltage) = 2.4 (LED 1) + 2.4 (LED 2) + Resistor. Arduino Project 1: Blinking an LED - Basics. Battery Energy and Runtime Calculator . NFC/RFID Planar Spiral Coil Inductance Calculator. GO TO CALCULATOR. This equation and calculator helps determine the value of the resistor to add to a light-emitting diode (LED) so that it can limit the current moving through the LED. No products in the cart. Calculate resistor value needed to drop excess voltage: excess voltage / led current = 6.2v / .025 amps = 248 ohm resistor (240 ohm is closest standard value) Calculate resistor watt value: (LED current)^2 * 240 ohms = .025 * .025 * 240 = .15 watts so a 1/2 watt resistor will have some breathing space. Mathematically, the flow of current through the LED can be written as. Calculation of Current-Limiting Resistors for a Single LED and LED Arrays. GO TO CALCULATOR. Power supply voltage (V): It has current limiting, thermal overload protection, and safe operating area protection. Third Resistance R = 15 . This equation and calculator helps determine the value of the resistor to add to a light-emitting diode (LED) so that it can limit the current moving through the LED. In this case, enter any two of the following values: the voltage across the resistor, the current through the resistor, or its resistance in ohms to find the power dissipation in watts. The circuit consists of a power supply (the Raspberry Pi), an LED that lights when the power is applied, and a resistor to limit the current that can flow through the circuit. Drone LiPo Battery Calculator. California voters have now received their mail ballots, and the November 8 general election has entered its final stage. LED series current limiting resistor calculator - useful when designing circuits with a single LED or series/parallel LED arrays - for both the common small-current (20mA) LEDs an. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Calculation of Current-Limiting Resistors for a Single LED and LED Arrays. Calculation of Current-Limiting Resistors for a Single LED and LED Arrays. The code you write is called a sketch. The images may represent electrical waveforms (oscilloscope), pictures (television set, computer monitor), radar targets, or other phenomena. LED series current limiting resistor calculator - useful when designing circuits with a single LED or series/parallel LED arrays - for both the common small-current (20mA) LEDs and the more expensive, high power LEDs with currents up to a few Amperes. LED Calculator. LED Calculator. Drone LiPo Battery Calculator. A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Amid rising prices and economic uncertaintyas well as deep partisan divisions over social and political issuesCalifornians are processing a great deal of information to help them choose state constitutional officers and A 4.7V Zener Diode (1N4732A) is used for this purpose. LED Lighting; News; Contact; 0 Menu Close. LED Resistor Calculator. LED series current limiting resistor calculator - useful when designing circuits with a single LED or series/parallel LED arrays - for both the common small-current (20mA) LEDs and the more expensive, high power LEDs with currents up to a few Amperes. MOS Technology, Inc. ("MOS" being short for Metal Oxide Semiconductor), later known as CSG (Commodore Semiconductor Group) and GMT Microelectronics, was a semiconductor design and fabrication company based in Audubon, Pennsylvania.It is most famous for its 6502 microprocessor and various designs for Commodore International's range of home computers LED series current limiting resistor calculator - useful when designing circuits with a single LED or series/parallel LED arrays - for both the common small-current (20mA) LEDs an. Trying to run your device / appliance in Australia? The RAMPS 1.4 offers no pull-up circuits, current limiting resistors or other protections. Drone LiPo Battery Calculator. This is because the current flowing through the first resistor has one path through each of the following resistors in the chain. For instance, in the example I just gave there's a 5V supply and 2 LEDs with a 2.4V Forward Voltage Drop each. Wiring improperly an endstop that uses 5V may damage an IO port on the ATmega 2560 or the Arduino itself, this is a particular issue with clones of the Arduino ATmega2560. The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. Amid rising prices and economic uncertaintyas well as deep partisan divisions over social and political issuesCalifornians are processing a great deal of information to help them choose state constitutional officers and So if you have an LED with a 1.7V drop and a current rating of 30mA, you find your current limiting resistor by the following method: (5.0V 1.7V) / .030A = 110 resistor. BACKFLOW CURRENT CONTROL UNIT (BCCU): The backflow current control unit was mention from the previous steps in detail ; Q1 is a reverse blocking, high-side N-channel MOSFET that provides a controllable blocking effect from Q2's body diode current leakage. The most common LED strips are designed with a group of LEDs in series with a current-limiting resistor in line with them. A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. LED Calculator. In the above figure, the circuit denoted as b explains the condition when the value of forward biased voltage is such that the voltage across the diode is almost 0.7 volts or potential barrier while the increment in value of forward current is very fast; As we continuously increase the forward-biased voltage-current also increases very fast with the forward-biased voltage, Fourth Resistance R = 22 . In the case of driver 1 (for Q1) there is a low pass RC filter in series, with a time constant of about 1 ms. Driver 2 is driven directly (as in the current circuit, but probably with a slightly higher series resistor to allow more current for the Q1 driver and its RC filter). The calculation also determines how much power the LED consumes. For the protection or limiting the current we simply use a resistor in series with it. So this resistor plays a key role in protecting the LED. Single-Layer Coil Inductance Calculator. How would you find out the voltage across that resistor? Where, IF is forward current Vs is a voltage source VD is the voltage drop across the light-emitting diode Rs is a current limiting resistor. Blinking an LED is the "Hello World" equivalent program. LED Resistor Calculator. LED series current limiting resistor calculator - useful when designing circuits with a single LED or series/parallel LED arrays - for both the common small-current (20mA) LEDs an. This LED calculator will help you design your LED array and choose the best current limiting resistors values. ERW = (Sv Vd)*(Dc/1000). No products in the cart. So if you have an LED with a 1.7V drop and a current rating of 30mA, you find your current limiting resistor by the following method: (5.0V 1.7V) / .030A = 110 resistor. Economy Step Down. Calculation of Current-Limiting Resistors for a Single LED and LED Arrays. A CRT on a television set is commonly called a picture tube. LED Calculator. In this case, enter any two of the following values: the voltage across the resistor, the current through the resistor, or its resistance in ohms to find the power dissipation in watts. NFC/RFID Planar Spiral Coil Inductance Calculator. Key Findings. So this resistor plays a key role in protecting the LED. The calculation also determines how much power the LED consumes. Amid rising prices and economic uncertaintyas well as deep partisan divisions over social and political issuesCalifornians are processing a great deal of information to help them choose state constitutional officers and So if you have an LED with a 1.7V drop and a current rating of 30mA, you find your current limiting resistor by the following method: (5.0V 1.7V) / .030A = 110 resistor. Of course we would want to include a current limiting resistor, right? The LED calculator will display the resistance value, draw a small schematic and show you the color code of the How would you find out the voltage across that resistor? For regulating the DC output of the Bridge Rectifier, we are using a Zener Diode. The wizard determines the current limiting resistor value for each portion of the array and calculates power consumed. 150kv Partial Discharge Free Transformer with current limiting resistor. About Our Coalition. This LED calculator will help you design your LED array and choose the best current limiting resistors values. 0 $ 0.00. In driver chip 3, IN is driven by D9 and SD is driven by D10. Thank you Fremin, actually if you use the first circuit with a proper limiting resistor, then the series resistor with the LED can be avoided. 0 $ 0.00. Calculate resistor value needed to drop excess voltage: excess voltage / led current = 6.2v / .025 amps = 248 ohm resistor (240 ohm is closest standard value) Calculate resistor watt value: (LED current)^2 * 240 ohms = .025 * .025 * 240 = .15 watts so a 1/2 watt resistor will have some breathing space. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. The most common LED strips are designed with a group of LEDs in series with a current-limiting resistor in line with them. It has current limiting, thermal overload protection, and safe operating area protection. 5 = 4.8 + Resistor. The circuit consists of a power supply (the Raspberry Pi), an LED that lights when the power is applied, and a resistor to limit the current that can flow through the circuit. Wiring improperly an endstop that uses 5V may damage an IO port on the ATmega 2560 or the Arduino itself, this is a particular issue with clones of the Arduino ATmega2560. A CRT on a television set is commonly called a picture tube. This LED resistor calculator will help you to pick up a right value of resistor for the LED in your LED circuit , you just have to input the values of Source voltage (V s ), LED forward current (I f ) and Led forward voltage (V f ). Drone LiPo Battery Calculator. Wiring improperly an endstop that uses 5V may damage an IO port on the ATmega 2560 or the Arduino itself, this is a particular issue with clones of the Arduino ATmega2560. /A > Single LED calculation Turn off an LED is the V OL and the November 8 general has Regulated DC is given to the LED can be written as note that method! 5 ( System voltage ) = 2.4 ( LED 2 ) + 2.4 ( LED 1 ) 2.4 Project, you instruct an Arduino to Turn ON and Turn off an LED a. 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