SSR Based High Voltage H-Bridge

by Lewis Loflin

See related Arduino Solid State Relay Motor Control.

To use the above H-bridge circuit power on 1B and 1b at the same time. Make sure 2A and 2B are turned off. Connect 1A-1B to Arduino DP9. Connect 2A-2B to DP10.

To reverse direction turn off DP9 then turn on DP10.

Only when the above is wired and programmed correctly - polarity reverses and the lamp stays off, move to next step.

Using the program below motor should forward and reverse by pressing SW1 and SW2.

This is the same except two of the solid state relays with bipolar transistors or MOSFETs.

#define SW1 2
#define SW2 3
#define LED1 9
#define LED2 10
#define LED3 11
#define pot 0

// HIGH = 1 and LOW = 0

#define ON 1
#define OFF 0

byte temp;

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(SW1, INPUT);
  digitalWrite(SW1, HIGH); // pull up on
  pinMode(SW2, INPUT);
  digitalWrite(SW2, HIGH); // pull up on

}

void loop() {
  delay(100);
  if ( S1() && !S2() ) {
    delay(200);
    if (S2()) { } // do nothing
    else digitalWrite(LED1, 1);
  }
  else digitalWrite(LED1, 0);

  if ( S2() && !S1() ) {
    delay(200);
    if ( S1() ) { } // do nothing
    else digitalWrite(LED2, 1);
  }
  else digitalWrite(LED2, 0);

  // power enable
  if ( S1() && S2() ) {
    byte temp = !digitalRead(LED3);
    digitalWrite(LED3, temp);
    while ( S1() || S2() ) {}
  } // end if
} // end loop

// returns 1 if switched pressed
byte  S1(void)   {
  if (digitalRead(SW1) != 1)   return 1;
  // or use (digitalRead(SW1) == 0)
  // 1 is a HIGH
  else return 0;
}

// returns 1 if switched pressed
byte  S2(void)   {
  if (digitalRead(SW2) != 1)   return 1;
  else return 0;
}

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