balcony_weather_station/node1.c

#include "bme280.h"
#include "pico/stdlib.h"
#include "pms5003.h"
#include "mqtt_client.h"
#include <hardware/gpio.h>
#include <hardware/i2c.h>
#include <hardware/uart.h>
#include <pico/time.h>
#include <pico/types.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

// 5 sec loop is for testing
// #define LOOP_INTERVAL_MS 5000
#define LOOP_INTERVAL_MS 30000

/**
 * Balcony Weather Station Node 1
 * record sensor data and send it to home assistant every 5 minutes
 * Sensors: BME280, PMS5003
 */

void comms_led_init() {
  gpio_init(16);
  gpio_set_dir(16, GPIO_OUT);
}

absolute_time_t comms_led_off_time;
int16_t comms_led_blink_count = 0;
bool comms_led_state = false;

void comms_led_blink() {
  printf("COMMS LED BLINK COUNT: %d\n", comms_led_blink_count);
  comms_led_blink_count++;
  if(!comms_led_state) {
    gpio_put(16, true);
    comms_led_state = true;
  }
  comms_led_off_time = make_timeout_time_ms(1000);
}

void comms_led_update() {
    if (comms_led_state && time_reached(comms_led_off_time)) {
      gpio_put(16, false);
      comms_led_state = false;
    }
}

static mqtt_client_config mqtt_config;

static pms5003_config pms_config;
static pms5003_reading current_pms5003_reading;

static bme280_config bem_config;
static bme280_reading current_bem280_reading;
static bme280_reading bem280_readings[10];
static int8_t readings_index = 0;

static bme280_reading calculate_average_bme280_reading() {
  float tempSum = 0;
  float pressureSum = 0;
  float humiditySum = 0;
  for (int i = 0; i < 10; i++) {
    tempSum += bem280_readings[i].temperature;
    pressureSum += bem280_readings[i].pressure;
    humiditySum += bem280_readings[i].humidity;
  }
  bme280_reading average_reading = {.temperature = tempSum / 10,
                                    .pressure = pressureSum / 10,
                                    .humidity = humiditySum / 10};
  return average_reading;
}

/**
 * Callback function called every 30 seconds
 */
static bool cb_30(__unused struct repeating_timer *t) {
  comms_led_blink();
  printf("cb_30: %d\n", readings_index);
  if (readings_index >= 10) {
    printf("Preparing data to send\n");
    readings_index = 0;

    // Calculate average BME280 reading
    current_bem280_reading = calculate_average_bme280_reading();
    printf("Tempature: %.2f\n", current_bem280_reading.temperature);
    printf("Pressure: %.2f\n", current_bem280_reading.pressure);
    printf("Humidity: %.2f\n", current_bem280_reading.humidity);

    printf("PM1: %.2f\n", current_pms5003_reading.pm1);
    printf("PM2.5: %.2f\n", current_pms5003_reading.pm2_5);
    printf("PM10: %.2f\n", current_pms5003_reading.pm10);
    // char msg[100];
    char msg[200];
    snprintf(msg, sizeof(msg),  "{\"temp\": %.2f, \"pressure\": %.2f, \"humidity\": %.2f, \"pm1\": %.2f, \"pm2_5\": %.2f, \"pm10\": %.2f}\n",
      current_bem280_reading.temperature, current_bem280_reading.pressure, current_bem280_reading.humidity,
      current_pms5003_reading.pm1, current_pms5003_reading.pm2_5, current_pms5003_reading.pm10);
    printf("Sending data to home assistant...\n");
    mqtt_client_pub_message(&mqtt_config, msg);
    return true;
  }

  // Read BME280
  printf("Making BME280 Reading\n");
  current_bem280_reading = bme280_read(&bem_config);
  bem280_readings[readings_index] = current_bem280_reading;

  if (readings_index == 2) {
    printf("Warming up PMSS5003\n");
    pms5003_warmup(&pms_config);
  }

  if (readings_index == 4) {
    printf("Starting reads on PMSS5003\n");
    pms5003_start_reading(&pms_config);
  }

  if (readings_index == 6) {
    printf("Finished reading PMSS5003\n");
    current_pms5003_reading = pms5003_finish_reading(&pms_config);
  }

  readings_index++;
  return true;
};

int main() {
  stdio_init_all();

  // Initialize communication LED
  comms_led_init();

  mqtt_client_init(&mqtt_config, "homeassistant/sensor/bws/node1/state", "bws-node1");

  // Setup BME280
  bme280_init(&bem_config, i2c1, 14, 15);

  // Setup PMS5003
  pms5003_init(&pms_config, uart1, 20, 21, 18, 19);

  struct repeating_timer timer_30;
  add_repeating_timer_ms(LOOP_INTERVAL_MS, cb_30, NULL, &timer_30);
  while (true) {
    comms_led_update();
    sleep_us(100);
    tight_loop_contents();
    mqtt_client_do_network_stuff(&mqtt_config);
  }
}