Transistor DC Relay lets your microcontroller control a higher-power 24V/30A circuit with a low-power 5V logic signal. This module like all RobotDyn relays is equipped with an opto-isolator that protects the MCU and its user from high currents and voltage. If you need, you can install an additional jeat sink to the transistor.

• ID @ TC = 25°C Continuous Drain Current, VGS @ 10V: 33 A
• ID @ TC = 100°C Continuous Drain Current, VGS @ 10V: 23 A
• IDM Pulsed Drain Current: 110 A
• PD @TC = 25°C Power Dissipation: 130 W
• Linear Derating Factor: 0.87 W/°C
• VGS Gate-to-Source Voltage: ± 20 V
• IAR Avalanche Current: 16 A
• EAR Repetitive Avalanche Energy: 13 mJ
• dv/dt Peak Diode Recovery dv/dt: 7.0 V/ns

|---|---| |S|Control signal| |GND|Controller ground| |Vcc|Power/reference voltage (5V)|

Sets the output to the 24V DC power circuit proportional to the value read from the potentiometer.

int controlPin = 9;      // Transistor DC Relay connected to digital pin 9
int analogPin = 3;   // potentiometer connected to analog pin 3
int val = 0;         // variable to store the read value

void setup() {
  pinMode(controlPin, OUTPUT);  // sets the pin as output
}

void loop() {
  val = analogRead(analogPin);  // read the input pin
  analogWrite(controlPin, val / 4); // analogRead values go from 0 to 1023, analogWrite values from 0 to 255
}