SPDT Relay for Wokwi

spdt-relay.chip.c

#include "wokwi-api.h"
#include <stdio.h>
#include <stdlib.h>

DEFINE_PIN(COM);
DEFINE_PIN(NC);
DEFINE_PIN(NO);
DEFINE_PIN(COIL);

typedef struct {
  uint8_t pin_com,
  pin_t pin_nc,
  pin_t pin_no,
  uint32_t coil
} chip_state_t;

chip_state_t* EXPORT(chip_init)(void)) {
  chip_state_t *chip = malloc(sizeof(chip_state_t));
  chip->pin_com = pin_init("COM", INPUT);
  chip->pin_coil = pin_init("COIL", INPUT);
  chip->pin_nc = pin_init("NC", OUTPUT);
  chip->pin_no = pin_init("NO", OUTPUT);

  pin_watch(chip->pin_com, BOTH);

  return chip;
}

void EXPORT(chip_timer_event)(chip_state_t *chip, uint32_t timer_id) {
  uint32_t com = pin_read(chip->com);
  uint32_t coil = pin_read(chip->coil);
  
  if (com == HIGH && coil == HIGH) {
    pin_write(chip->nc, HIGH);
    pin_write(chip->no, LOW);
  } else if (com == LOW && coil == HIGH) {
    pin_write(chip->nc, LOW);
    pin_write(chip->no, HIGH);
  } else if (com == HIGH && coil == LOW) {
    pin_write(chip->nc, LOW);
    pin_write(chip->no, HIGH);
  } else if (com == LOW && coil == LOW) {
    pin_write(chip->nc, HIGH);
    pin_write(chip->no, LOW);
  }
}

spdt-relay.chip.json

{
  "name": "SPDT Relay",
  "author": "Chris Schmidt",
  "pins": [
    "NO",
    "NC",
    "COM",
    "GND",
    "NC",
    "COIL"
  ]
}

usage.json

{
      "type": "chip-spdt-relay",
      "id": "relay1",
      "top": 0,
      "left": 0,
      "attrs": {}
    }