add BH1750

README.md

@@ -36,6 +36,29 @@ SDA        | IO21      |
 SDO        | nc        | SPI only
 CS         | nc        | SPI only
 
+### BH1750 (GY-30)
+
+I2C
+
+GY-30 pin  | ESP32 pin | Notes
+-----------|-----------|----------
+GND        |           |
+AD0        | nc        |
+SDA        | IO21      |
+SCL        | IO22      |
+VCC        |           |
+
+### VEML6075
+
+I2C
+
+GY-30 pin  | ESP32 pin | Notes
+-----------|-----------|----------
+VIN        |           |
+GND        |           |
+SCL        | IO22      |
+SDA        | IO21      |
+
 ### SDS011
 
 Serial (HardwareSerial2)
@@ -76,3 +99,5 @@ This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md
 * [GxEPD2](https://github.com/ZinggJM/GxEPD2) - E-Paper display library
 * [Adafruit BME680](https://github.com/adafruit/Adafruit_BME680) - BME680 sensor library
 * [Nova Fitness SDS dust sensors arduino library](https://github.com/lewapek/sds-dust-sensors-arduino-library.git) - SDS011 Laser dust sensor library
+* [BH1750](https://github.com/claws/BH1750/) - BH1750 sensor library
+* [VEML6075](https://github.com/adafruit/Adafruit_VEML6075) - VEML6075 sensor library

platformio.ini

@@ -43,6 +43,7 @@ lib_deps =
     Adafruit Unified Sensor
     Adafruit BusIO
     Adafruit VEML6075 Library
+    BH1750
 ;    SDS011 sensor Library
 ;    Nova Fitness Sds dust sensors library
     https://github.com/lewapek/sds-dust-sensors-arduino-library.git

src/main.cpp

@@ -24,6 +24,7 @@
 #include "Adafruit_BME680.h"
 
 #include "Adafruit_VEML6075.h"
+#include <BH1750.h>
 
 #define ARDUINO_SAMD_VARIANT_COMPLIANCE
 #include "SdsDustSensor.h"
@@ -48,6 +49,7 @@ Adafruit_BME680 bme680; // I2C (also available: hardware SPI
 //HardwareSerial Serial2(2);
 SdsDustSensor sds(Serial2);
 Adafruit_VEML6075 uv = Adafruit_VEML6075();
+BH1750 lightMeter;
 
 XD0OTA ota("esp32-weatherstation");
 XD0MQTT mqtt;
@@ -59,6 +61,7 @@ struct __attribute__((packed)) sensor_readings_t {
   uint32_t voc = 0; // Ohm
   float pm10 = NAN; // µg/m³
   float pm25 = NAN; // µg/m³
+  float lux = NAN;
   float uvi = NAN;
   float uva = NAN;
   float uvb = NAN;
@@ -75,6 +78,7 @@ uint32_t lastDisplayRefresh = 0;
 bool bme280_active = false;
 bool bme680_active = false;
 bool uv_active = false;
+bool light_active = false;
 bool sds_active = false;
 
 void helloWorld()
@@ -161,6 +165,10 @@ void getSensorMeasurements() {
     sensor_readings.uvb = uv.readUVB();
   }
 
+  if (light_active) {
+    sensor_readings.lux = lightMeter.readLightLevel();
+  }
+
   if (sds_active) {
     PmResult pm = sds.readPm();
     if (pm.isOk()) {
@@ -325,6 +333,11 @@ void displayValues() {
     display.printf("%.1f", pm10);
     display.setCursor(200,y_offset+65);
     display.printf("%.1f", pm25);
+    // Lux
+    //display.setCursor(200,y_offset+80);
+    //display.println("Lux:");
+    //display.setCursor(200,y_offset+90);
+    //display.printf("%.1f", sensor_readings.lux);
     // UV
     float uvi, uva, uvb;
     if (uv_active) {
@@ -451,6 +464,12 @@ void sendValues() {
     delay(10);
   }
 
+  if (light_active) {
+    String topic_lux = String("thomas/sensor/") + ota.getMAC() + String("/lux");
+    mqtt.publish(topic_lux.c_str(), sensor_readings.lux, "%.2f");
+    delay(10);
+  }
+
   if (sds_active) {
     String topic_pm10 = String("thomas/sensor/") + ota.getMAC() + String("/pm10");
     String topic_pm25 = String("thomas/sensor/") + ota.getMAC() + String("/pm25");
@@ -515,6 +534,10 @@ void setup()
     Serial.println("Failed to communicate with VEML6075 sensor, check wiring?");
   }
 
+  if (lightMeter.begin()) {
+    light_active = true;
+  }
+
   sds.begin();
 
   FirmwareVersionResult sds_fw = sds.queryFirmwareVersion();