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"

// Externs
extern void ledc_init(void);
extern void init_pcnt_unit(int unit);

const int pcnt_unit = PCNT_UNIT_0;

// 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)
{
    printf("HomeEnergyMeter ESP32\n");

    init_pcnt_unit(pcnt_unit);
    ledc_init();

    for (int i = 600; i >= 0; i--) {
        int16_t count = 0;
        pcnt_get_counter_value(pcnt_unit, &count);
        printf("%d\n",count);
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
    printf("Restarting now.\n");
    fflush(stdout);
    esp_restart();
}