WLED/usermods/photoresistor_sensor_mqtt_v1/usermod.cpp

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2020-07-16 17:29:06 +02:00
#include "wled.h"
/*
* This v1 usermod file allows you to add own functionality to WLED more easily
* See: https://github.com/Aircoookie/WLED/wiki/Add-own-functionality
* EEPROM bytes 2750+ are reserved for your custom use case. (if you extend #define EEPSIZE in const.h)
* If you just need 8 bytes, use 2551-2559 (you do not need to increase EEPSIZE)
*
* Consider the v2 usermod API if you need a more advanced feature set!
*/
//Use userVar0 and userVar1 (API calls &U0=,&U1=, uint16_t)
const int LIGHT_PIN = A0; // define analog pin
const long UPDATE_MS = 30000; // Upper threshold between mqtt messages
const char MQTT_TOPIC[] = "/light"; // MQTT topic for sensor values
const int CHANGE_THRESHOLD = 5; // Change threshold in percentage to send before UPDATE_MS
// variables
long lastTime = 0;
long timeDiff = 0;
long readTime = 0;
int lightValue = 0;
float lightPercentage = 0;
float lastPercentage = 0;
//gets called once at boot. Do all initialization that doesn't depend on network here
void userSetup()
{
pinMode(LIGHT_PIN, INPUT);
}
//gets called every time WiFi is (re-)connected. Initialize own network interfaces here
void userConnected()
{
}
void publishMqtt(float state)
{
//Check if MQTT Connected, otherwise it will crash the 8266
if (mqtt != nullptr){
char subuf[38];
strcpy(subuf, mqttDeviceTopic);
strcat(subuf, MQTT_TOPIC);
mqtt->publish(subuf, 0, true, String(state).c_str());
}
}
//loop. You can use "if (WLED_CONNECTED)" to check for successful connection
void userLoop()
{
// Read only every 500ms, otherwise it causes the board to hang
if (millis() - readTime > 500)
{
readTime = millis();
timeDiff = millis() - lastTime;
// Convert value to percentage
lightValue = analogRead(LIGHT_PIN);
lightPercentage = ((float)lightValue * -1 + 1024)/(float)1024 *100;
// Send MQTT message on significant change or after UPDATE_MS
if (abs(lightPercentage - lastPercentage) > CHANGE_THRESHOLD || timeDiff > UPDATE_MS)
{
publishMqtt(lightPercentage);
lastTime = millis();
lastPercentage = lightPercentage;
}
}
}