Chain Switch Tutorial

#include "M5Chain.h"

#define RXD_PIN GPIO_NUM_5  // 47 for the other side of Chain DualKey
#define TXD_PIN GPIO_NUM_6  // 48 for the other side of Chain DualKey

Chain M5Chain;

device_list_t *device_list = NULL;
uint16_t device_count = 0;
uint8_t opr_status = 0;

uint8_t switch_id = 0;
bool switch_found = false;

const uint16_t OPEN_THRESHOLD = 3967;
const uint16_t CLOSE_THRESHOLD = 128;

void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.println("===========================");
  Serial.println("M5Stack Chain Switch Test");

  M5Chain.begin(&Serial2, 115200, RXD_PIN, TXD_PIN);
  while (!M5Chain.isDeviceConnected()) {
    Serial.println("No device connected");
    delay(1000);
  }

  M5Chain.getDeviceNum(&device_count);
  device_list = (device_list_t *)malloc(sizeof(device_list_t));
  device_list->count = device_count;
  device_list->devices = (device_info_t *)malloc(sizeof(device_info_t) * device_count);
  M5Chain.getDeviceList(device_list);

  for (uint16_t i = 0; i < device_count; i++) {
    if (device_list->devices[i].device_type == CHAIN_SWITCH_TYPE_CODE) {
      switch_id = device_list->devices[i].id;
      switch_found = true;
      Serial.printf("ID[%d] is Chain Switch\n", switch_id);
      break;
    }
  }

  if (!switch_found) {
    Serial.println("Chain Switch not found");
    return;
  }

  // Set the onboard RGB LED brightness (0-100).
  M5Chain.setRGBLight(switch_id, 50, &opr_status);

  // Set open/close thresholds without saving them to flash.
  M5Chain.setSwitchThresholdValue(switch_id, OPEN_THRESHOLD, CLOSE_THRESHOLD,
                                  &opr_status, CHAIN_SAVE_FLASH_DISABLE);
  M5Chain.setSwitchDirection(switch_id, CHAIN_SWITCH_DOWNUP_INC, &opr_status,
                             CHAIN_SAVE_FLASH_DISABLE);
}

void loop() {
  if (!switch_found) {
    delay(1000);
    return;
  }

  uint16_t switch12Bit = 0;
  switch_status_type_t switch_status = CHAIN_SWITCH_OPEN;

  if (M5Chain.getSwitch12BitAdc(switch_id, &switch12Bit) == CHAIN_OK &&
      M5Chain.getSwitchStatus(switch_id, &switch_status) == CHAIN_OK) {
    uint8_t rgb[3];
    if (switch_status == CHAIN_SWITCH_CLOSE) {
      rgb[0] = 0;
      rgb[1] = 255;
      rgb[2] = 0;
    } else {
      rgb[0] = 255;
      rgb[1] = 0;
      rgb[2] = 0;
    }
    M5Chain.setRGBValue(switch_id, 0, 1, rgb, sizeof(rgb), &opr_status);

    Serial.printf("ADC: %u, status: %s\n", switch12Bit,
                  switch_status == CHAIN_SWITCH_CLOSE ? "ON" : "OFF");
  } else {
    Serial.println("Failed to read Chain Switch");
  }

  delay(200);
}