Hello
I am currently struggling, due to my limited knowledge on electronics, in a way on how to increase the amplitude of the PWM signal that comes out of the digital pins;
I am looking to produce a square PWM signal, from arduino, between 100 and 400 Hz with 10V of Max amplitude and 0 V of minimum amplitude in order to supply the coil of two relays. The relays I am using are RTH14012. In the Relay, I am supplying current from a current source to the pole (pin 11 - according to the datasheet). I have supplied currents between 10 mA and 50 mA in previous tests that eventually led to the damage of the microcontroller. I also have a resistor of 4.3kohm in pin 14 (channel2) and another resistor of 4.64kohm in pin 12 (channel1). I also programmed code in order to light a green LED to light up when the relay has current passing through channel 1 and a Blue LED to light up when the relay has current passing through channel 2.
Currently I am supplying the coil with a wave generator using a 10 V amplitude and 100 Hz frequency and I need to replace this wave generator with a pwm signal from the arduino but I am having a hard time understading what component or circuit I should use in order to amplify the amplitude from the arduino's pwm signal.
I also can't figure out why my microcontrollers keep getting damaged. I have try to reduce the current to 10 mA applied to both relays but it keeps happening.
I appreciate some guidance.
Thank you.
The code I use to test the circuit with a wave generator is this one:
const int A1Pin = 4; // Input 1 pin
const int B1Pin = 5; // Input 2 pin
const int A2Pin = 6; // Input 3 pin
const int B2Pin = 7; // Input 4 pin
// Pins for controlling LEDs
const int blueLEDPin = 2; // Blue LED pin
const int greenLEDPin = 3; // Green LED pin
void setup() {
// Initialize input pins
pinMode(A1Pin, INPUT);
pinMode(B1Pin, INPUT);
pinMode(A2Pin, INPUT);
pinMode(B2Pin, INPUT);
// Initialize LED pins as outputs
pinMode(blueLEDPin, OUTPUT);
pinMode(greenLEDPin, OUTPUT);
}
void loop() {
// Read the state of inputs
int input1State = digitalRead(A1Pin);
int input2State = digitalRead(B1Pin);
int input3State = digitalRead(A2Pin);
int input4State = digitalRead(B2Pin);
// If Input 1 and Input 3 are high
if (input1State == HIGH && input3State == HIGH) {
// Turn on the blue LED
digitalWrite(blueLEDPin, HIGH);
// Turn off the green LED
digitalWrite(greenLEDPin, LOW);
}
// If Input 2 and Input 4 are high
else if (input2State == HIGH && input4State == HIGH) {
// Turn off the blue LED
digitalWrite(blueLEDPin, LOW);
// Turn on the green LED
digitalWrite(greenLEDPin, HIGH);
}
// If none of the specified conditions are met
else {
// Turn off both LEDs
digitalWrite(blueLEDPin, LOW);
digitalWrite(greenLEDPin, LOW);
}
}