ＬｏＲａモジュール評価ボード　Ｅ２２０－９００Ｔ２２Ｓ（ＪＰ）－ＥＶ１を使ったLoRa通信受信側 M5AtomLite使用

main.cpp

#include <Arduino.h>
#include <M5Unified.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <FastLED.h>

#define LED_PIN       27
#define NUM_LEDS      1

#define LORA_M0_PIN   21
#define LORA_M1_PIN   25
#define LORA_RX_PIN   23
#define LORA_TX_PIN   19

// change here for your environment
#define SSID        "... your wifi ssid .."
#define PASSWORD    "...your wifi password ..."
#define URL         "... google spread sheet app script deply url ..."


#define REC_BUF_SIZE    128

char gps_rec_buf[REC_BUF_SIZE];
static char gps_rec_buf_idx = 0;

static double rec_time;
static double latitude;
static double longitude;

static CRGB leds[NUM_LEDS];

void setLed(CRGB color) {
  // change RGB to GRB
  uint8_t t = color.r;
  color.r = color.g;
  color.g = t;
  leds[0] = color;
  FastLED.show();
}

void setLoraMode(int mode) {
  pinMode(LORA_M0_PIN, OUTPUT);
  pinMode(LORA_M1_PIN, OUTPUT);
  digitalWrite(LORA_M0_PIN, mode & 0x1 != 0);
  digitalWrite(LORA_M1_PIN, mode & 0x2 != 0);
}

static void send_to_spreadsheet(char *str) {
  char buf[REC_BUF_SIZE];
  strncpy(buf, str, REC_BUF_SIZE);

  int i = 0;
  char *pt;

  pt = strtok(buf, ",");
  while (pt != NULL) {
    //Serial.println(pt);
    switch (i) {
      case 0:
        rec_time = atof(pt);
      case 1:
        latitude = atof(pt);
        break;
      case 2:
        longitude = atof(pt);
        break;
      default:
        break;
    }
    pt = strtok(NULL, ",");
    i++;
  }
  sprintf(buf, "{\"time\":%f,\"latitude\":%f,\"longitude\":%f}", rec_time, latitude, longitude);

  Serial.println(buf);

  HTTPClient http;
  http.begin(URL);
  http.addHeader("Content-Type", "application/json");
  int status_code = http.POST((uint8_t*)buf, strlen(buf));
  if( status_code == 200 ){
    Serial.println("success");
  }
  http.end();
}

void setup() {
  M5.begin();
  Serial.begin(115200);
  Serial2.begin(9600, SERIAL_8N1, LORA_RX_PIN, LORA_TX_PIN);
  setLoraMode(0);

  FastLED.addLeds<WS2811, LED_PIN, RGB>(leds, NUM_LEDS);
  FastLED.setBrightness(255 * 15 / 100);
  setLed(CRGB::Green);

  WiFi.begin(SSID, PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
  }
  Serial.println(WiFi.localIP());
}

void loop() {
  if (Serial2.available()) {
    int ch = Serial2.read();
    if (gps_rec_buf_idx < REC_BUF_SIZE) {
      gps_rec_buf[gps_rec_buf_idx++] = ch;

    }

    Serial.write(ch);

    // 1行受信
    if (ch == '\n') {
      gps_rec_buf[gps_rec_buf_idx++] = '\0';
      gps_rec_buf_idx = 0;
      setLed(CRGB::Red);
      send_to_spreadsheet(gps_rec_buf);
      setLed(CRGB::Green);
    }
  }
  delay(10);
}

platformio.ini

[env:m5stack-atom]
platform = espressif32
board = m5stack-atom
framework = arduino
monitor_speed = 115200
lib_deps =
  m5stack/M5Unified@^0.1.4
  fastled/FastLED@^3.5.0