HomeEnergyMeter/main/main.c

#include <stdio.h>
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_spi_flash.h"
#include "freertos/queue.h"
#include "driver/ledc.h"
#include "driver/pcnt.h"
#include "esp_attr.h"
#include "esp_log.h"
#include "config.h"
#include "wifi.h"

// Externs
extern void ledc_init(void);
extern void init_pcnt_unit();
extern uint32_t getkWh();

extern void mqtt_init();
extern void sendMQTTMessage(const char * topic, const char * data);

// Chip info:
// This is esp32 chip with 2 CPU cores, WiFi/BT/BLE, silicon revision 1, 4MB external flash

/** Electric meter:
 * 10000 impulses per kWh
 * Some normal max number could be 120 kWh/24h = 5 kWh/hour = 50000 pulses/hour = 833 pulses/min = 14 pulses/sec
 * 
 * Counter is 16 bit signed = Max 32768 pulses = Will NOT work for one hour !!!!!
 * So we need some other way of counting higher numbers that will last for one h
 * Probably we need to use interrupts !
 */

void app_main(void)
{
    ESP_LOGI("MAIN", "HomeEnergyMeter ESP32");

    init_pcnt_unit();
    ledc_init();
#ifdef WIFI_ENABLED
    initWifi();             // Init WIFI
#endif
    mqtt_init();

    uint32_t kWh = 0;
    char txt[100];

    TickType_t vLastWakeTime = xTaskGetTickCount();
    const TickType_t xFreq = 60000 / portTICK_PERIOD_MS;

    while( true ) {

        kWh = getkWh();

        sprintf(txt,"%u",kWh);
        sendMQTTMessage("basement/meter/electricalTotal", txt);

        ESP_LOGI("MAIN", "%u",kWh);

        vTaskDelayUntil( &vLastWakeTime, xFreq );
    }
    esp_restart();
}