253 lines
8.0 KiB
C++
253 lines
8.0 KiB
C++
// force the compiler to show a warning to confirm that this file is included
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#warning **** Included USERMOD_BH1750 ****
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#ifndef WLED_ENABLE_MQTT
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#error "This user mod requires MQTT to be enabled."
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#endif
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#pragma once
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#include "wled.h"
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#include <BH1750.h>
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// the max frequency to check photoresistor, 10 seconds
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#ifndef USERMOD_BH1750_MAX_MEASUREMENT_INTERVAL
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#define USERMOD_BH1750_MAX_MEASUREMENT_INTERVAL 10000
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#endif
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// the min frequency to check photoresistor, 500 ms
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#ifndef USERMOD_BH1750_MIN_MEASUREMENT_INTERVAL
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#define USERMOD_BH1750_MIN_MEASUREMENT_INTERVAL 500
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#endif
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// how many seconds after boot to take first measurement, 10 seconds
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#ifndef USERMOD_BH1750_FIRST_MEASUREMENT_AT
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#define USERMOD_BH1750_FIRST_MEASUREMENT_AT 10000
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#endif
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// only report if differance grater than offset value
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#ifndef USERMOD_BH1750_OFFSET_VALUE
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#define USERMOD_BH1750_OFFSET_VALUE 1
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#endif
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class Usermod_BH1750 : public Usermod
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{
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private:
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int8_t offset = USERMOD_BH1750_OFFSET_VALUE;
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unsigned long maxReadingInterval = USERMOD_BH1750_MAX_MEASUREMENT_INTERVAL;
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unsigned long minReadingInterval = USERMOD_BH1750_MIN_MEASUREMENT_INTERVAL;
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unsigned long lastMeasurement = UINT32_MAX - (USERMOD_BH1750_MAX_MEASUREMENT_INTERVAL - USERMOD_BH1750_FIRST_MEASUREMENT_AT);
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unsigned long lastSend = UINT32_MAX - (USERMOD_BH1750_MAX_MEASUREMENT_INTERVAL - USERMOD_BH1750_FIRST_MEASUREMENT_AT);
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// flag to indicate we have finished the first readLightLevel call
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// allows this library to report to the user how long until the first
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// measurement
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bool getLuminanceComplete = false;
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// flag set at startup
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bool enabled = true;
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// strings to reduce flash memory usage (used more than twice)
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static const char _name[];
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static const char _enabled[];
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static const char _maxReadInterval[];
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static const char _minReadInterval[];
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static const char _offset[];
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static const char _HomeAssistantDiscovery[];
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bool initDone = false;
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bool sensorFound = false;
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// Home Assistant and MQTT
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String mqttLuminanceTopic = F("");
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bool mqttInitialized = false;
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bool HomeAssistantDiscovery = true; // Publish Home Assistant Discovery messages
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BH1750 lightMeter;
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float lastLux = -1000;
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bool checkBoundSensor(float newValue, float prevValue, float maxDiff)
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{
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return isnan(prevValue) || newValue <= prevValue - maxDiff || newValue >= prevValue + maxDiff || (newValue == 0.0 && prevValue > 0.0);
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}
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// set up Home Assistant discovery entries
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void _mqttInitialize()
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{
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mqttLuminanceTopic = String(mqttDeviceTopic) + F("/brightness");
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if (HomeAssistantDiscovery) _createMqttSensor(F("Brightness"), mqttLuminanceTopic, F("Illuminance"), F(" lx"));
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}
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// Create an MQTT Sensor for Home Assistant Discovery purposes, this includes a pointer to the topic that is published to in the Loop.
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void _createMqttSensor(const String &name, const String &topic, const String &deviceClass, const String &unitOfMeasurement)
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{
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String t = String(F("homeassistant/sensor/")) + mqttClientID + F("/") + name + F("/config");
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StaticJsonDocument<600> doc;
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doc[F("name")] = String(serverDescription) + F(" ") + name;
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doc[F("state_topic")] = topic;
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doc[F("unique_id")] = String(mqttClientID) + name;
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if (unitOfMeasurement != "")
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doc[F("unit_of_measurement")] = unitOfMeasurement;
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if (deviceClass != "")
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doc[F("device_class")] = deviceClass;
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doc[F("expire_after")] = 1800;
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JsonObject device = doc.createNestedObject(F("device")); // attach the sensor to the same device
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device[F("name")] = serverDescription;
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device[F("identifiers")] = "wled-sensor-" + String(mqttClientID);
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device[F("manufacturer")] = F("WLED");
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device[F("model")] = F("FOSS");
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device[F("sw_version")] = versionString;
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String temp;
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serializeJson(doc, temp);
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DEBUG_PRINTLN(t);
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DEBUG_PRINTLN(temp);
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mqtt->publish(t.c_str(), 0, true, temp.c_str());
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}
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public:
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void setup()
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{
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if (i2c_scl<0 || i2c_sda<0) { enabled = false; return; }
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sensorFound = lightMeter.begin();
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initDone = true;
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}
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void loop()
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{
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if ((!enabled) || strip.isUpdating())
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return;
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unsigned long now = millis();
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// check to see if we are due for taking a measurement
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// lastMeasurement will not be updated until the conversion
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// is complete the the reading is finished
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if (now - lastMeasurement < minReadingInterval)
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{
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return;
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}
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bool shouldUpdate = now - lastSend > maxReadingInterval;
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float lux = lightMeter.readLightLevel();
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lastMeasurement = millis();
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getLuminanceComplete = true;
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if (shouldUpdate || checkBoundSensor(lux, lastLux, offset))
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{
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lastLux = lux;
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lastSend = millis();
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#ifndef WLED_DISABLE_MQTT
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if (WLED_MQTT_CONNECTED)
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{
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if (!mqttInitialized)
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{
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_mqttInitialize();
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mqttInitialized = true;
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}
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mqtt->publish(mqttLuminanceTopic.c_str(), 0, true, String(lux).c_str());
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DEBUG_PRINTLN(F("Brightness: ") + String(lux) + F("lx"));
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}
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else
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{
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DEBUG_PRINTLN(F("Missing MQTT connection. Not publishing data"));
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}
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#endif
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}
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}
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inline float getIlluminance() {
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return (float)lastLux;
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}
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void addToJsonInfo(JsonObject &root)
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{
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JsonObject user = root[F("u")];
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if (user.isNull())
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user = root.createNestedObject(F("u"));
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JsonArray lux_json = user.createNestedArray(F("Luminance"));
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if (!enabled) {
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lux_json.add(F("disabled"));
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} else if (!sensorFound) {
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// if no sensor
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lux_json.add(F("BH1750 "));
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lux_json.add(F("Not Found"));
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} else if (!getLuminanceComplete) {
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// if we haven't read the sensor yet, let the user know
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// that we are still waiting for the first measurement
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lux_json.add((USERMOD_BH1750_FIRST_MEASUREMENT_AT - millis()) / 1000);
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lux_json.add(F(" sec until read"));
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return;
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} else {
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lux_json.add(lastLux);
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lux_json.add(F(" lx"));
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}
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}
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// (called from set.cpp) stores persistent properties to cfg.json
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void addToConfig(JsonObject &root)
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{
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// we add JSON object.
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JsonObject top = root.createNestedObject(FPSTR(_name)); // usermodname
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top[FPSTR(_enabled)] = enabled;
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top[FPSTR(_maxReadInterval)] = maxReadingInterval;
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top[FPSTR(_minReadInterval)] = minReadingInterval;
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top[FPSTR(_HomeAssistantDiscovery)] = HomeAssistantDiscovery;
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top[FPSTR(_offset)] = offset;
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DEBUG_PRINTLN(F("BH1750 config saved."));
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}
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// called before setup() to populate properties from values stored in cfg.json
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bool readFromConfig(JsonObject &root)
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{
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// we look for JSON object.
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JsonObject top = root[FPSTR(_name)];
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if (top.isNull())
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{
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DEBUG_PRINT(FPSTR(_name));
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DEBUG_PRINT(F("BH1750"));
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DEBUG_PRINTLN(F(": No config found. (Using defaults.)"));
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return false;
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}
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bool configComplete = !top.isNull();
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configComplete &= getJsonValue(top[FPSTR(_enabled)], enabled, false);
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configComplete &= getJsonValue(top[FPSTR(_maxReadInterval)], maxReadingInterval, 10000); //ms
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configComplete &= getJsonValue(top[FPSTR(_minReadInterval)], minReadingInterval, 500); //ms
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configComplete &= getJsonValue(top[FPSTR(_HomeAssistantDiscovery)], HomeAssistantDiscovery, false);
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configComplete &= getJsonValue(top[FPSTR(_offset)], offset, 1);
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DEBUG_PRINT(FPSTR(_name));
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if (!initDone) {
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DEBUG_PRINTLN(F(" config loaded."));
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} else {
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DEBUG_PRINTLN(F(" config (re)loaded."));
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}
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return configComplete;
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}
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uint16_t getId()
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{
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return USERMOD_ID_BH1750;
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}
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};
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// strings to reduce flash memory usage (used more than twice)
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const char Usermod_BH1750::_name[] PROGMEM = "BH1750";
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const char Usermod_BH1750::_enabled[] PROGMEM = "enabled";
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const char Usermod_BH1750::_maxReadInterval[] PROGMEM = "max-read-interval-ms";
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const char Usermod_BH1750::_minReadInterval[] PROGMEM = "min-read-interval-ms";
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const char Usermod_BH1750::_HomeAssistantDiscovery[] PROGMEM = "HomeAssistantDiscoveryLux";
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const char Usermod_BH1750::_offset[] PROGMEM = "offset-lx";
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