You can directly download the code and modify it according to your requirement. The code is very simple, the main purpose of this code is to supply varying gate voltage. Software Code: Software code is written in Arduino programming and compiled using Arduino IDE. You can download an accurate size PCB diagram in PDF format from the link below.įigure 4: Solder Side PCB for LED Strip Driverįigure 5: Component Side PCB for LED Strip Driver However when I added more transistors to the circuit, I ran into a problem. Now I am somewhat familiar with transistors and their usage, and had no issue setting up one instance of this control scheme. ![]() The solder side and component side PCB as shown in the figure below is scaled by 200%. 1 I am attempting to individual control multiple LED-based light sources via PWM. The PCB diagram shown here is only for the MOSFET driver unit. PCB Diagram: The PCB diagram is designed using Proteus 8.1. The source pin (S) of all these MOSFETs is grounded where the drain pin of each MOSFET is connected to a different LED as shown in a circuit diagram.įigure 3: Author Prototype for Arduino MOSFET LED Driver Circuit Three individual resistors each of 5.6K ground the gate pin of all these MOSFETs. Arduino pin 5, 6, and 9 is connected to these three MOSFET gate as shown in the circuit diagram. The driver circuit is designed around three MOSFETs for three different LEDs (RED, GREEN, and BLUE). This is required for the feeding effect of LED. PWM pin can supply different voltages from the range of 0V to 5V in 255 steps. the voltage at the gate (G) determines the conduction level. We are using PWM pins instead of a normal digital pin because MOSFET is a voltage control device i.e. Here, we are using three PWM pins of Arduino board (pin 5, 6, and 9 but you can use any PWM pin). The control circuit is designed around the Arduino uno board. Here, in this project we are using a 12V, 2A power supply adapter. Note: You can also use a 12V, 2A adapter for the power supply. X1 = 220V to 15V, 2A secondary transformerĬ1 = 1000 uF, 25V (electrolytic capacitor) ![]() 12V at 2A is available at the output pin of 7812 which is given to the power supply pin of the LED strip. This rectified DC is filtered using high-value electrolytic capacitor C1 (1000 uF) and given to the input of 12V series voltage regulator IC (MC7812ACTG). This 15V AC is rectified using a bridge rectifier designed around four rectifier diodes. The input from AC mains is given to the primary side of the transformer, and 15V AC is available on the secondary side. The power supply circuit is designed using a step-down transformer and a 12V fixed voltage regulator. The circuit is divided into two main sections i.e. The circuit is shown in figure 1, built around the Arduino uno board, MOSFET, and a few other components. Component Required for Arduino MOSFET LED Driver Circuitġ2V, 2A power supply adapter Circuit Description of Arduino MOSFET LED Driver Circuit If you want to know more about MOSFET, its type, Symbol, application, and characteristic curve please do read the previous article on MOSFET | Types of MOSFET | Circuit Symbol.
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