battery_test.ino

SYSTEM_THREAD(ENABLED);
#include "HttpClient/HttpClient.h"
#include "PowerShield/PowerShield.h"

/**
* Declaring the variables.
*/
HttpClient http;

const long sleep_interval = 60*5;
const long one_day_millis = 60*60*24*1000;
const float battery_threshold = 20.0;

// Headers currently need to be set at init, useful for API keys etc.
http_header_t headers[] = {
    { "Content-Type", "application/json" },
    { "Accept" , "application/json" },
    { NULL, NULL } // NOTE: Always terminate headers will NULL
};

http_request_t request;
http_response_t response;

PowerShield batteryMonitor;


void setup() {

    Wire.begin(); 
    batteryMonitor.reset();
    batteryMonitor.quickStart();
    Time.zone(1.0);
    waitUntil(WiFi.ready);
}

void send_update(float temp, float soc) {
    time_t time = Time.now();
    String timeString = Time.format(time, TIME_FORMAT_ISO8601_FULL);
    request.hostname = "raindrop.frickel.club";
    request.port = 80;
    request.path = "/station/test";
    request.body = "{\"Time\" :\""+timeString+"\", \"Temperature\" : "+String(temp)+", \"Battery\" : "+String(soc)+"}";
    http.post(request, response, headers);  
}

void ensure_time_sync() {
    static unsigned long last_time_sync = millis();
    unsigned long now = millis();
    if(now-last_time_sync > one_day_millis){
        Particle.syncTime();
        last_time_sync = millis();
    }
}

void loop() {
    ensure_time_sync();
    float stateOfCharge = batteryMonitor.getSoC();
    send_update(0.8, stateOfCharge);
    if(stateOfCharge < battery_threshold){
        float sleep_factor = battery_threshold/stateOfCharge;
        long sleep_time = (float) sleep_interval*(sleep_factor*sleep_factor);
        System.sleep(SLEEP_MODE_DEEP, sleep_time);
    }
    delay(20000);
}