VEML7700 in ESPHome

Sat, 29 Feb 2020 00:00:00 +0000

I have a VEML7700 digital light level sensor, which is not supported by ESPHome, but can be used as a custom i2c component. This is how:

# espnode.yaml

esphome:
...
includes:
    - veml7700_custom_sensor.h
libraries:
    - "https://github.com/adafruit/Adafruit_VEML7700"

sensor:
- platform: custom
    lambda: |-
    auto veml7700 = new VEML7700CustomSensor();
    App.register_component(veml7700);
    return {veml7700, veml7700->lux_sensor, veml7700->white_sensor, veml7700->als_sensor};
    sensors:
    - name: "VEML7700 Light" # Required dummy sensor
    - name: "VEML770 Lux"
        unit_of_measurement: Lux
        accuracy_decimals: 0
    - name: "VEML770 White"
        unit_of_measurement: raw
        accuracy_decimals: 0
    - name: "VEML770 ALS"
        unit_of_measurement: raw
        accuracy_decimals: 0

# veml7700_custom_sensor.h

#include "esphome.h"
#include "Adafruit_VEML7700.h"

// Requires this lib installed: $ platformio lib --global install "Adafruit BusIO"
// based on https://github.com/adafruit/Adafruit_VEML7700/blob/master/examples/veml7700_test/veml7700_test.ino


class VEML7700CustomSensor : public PollingComponent, public Sensor {
public:
Adafruit_VEML7700 veml = Adafruit_VEML7700();

Sensor *lux_sensor = new Sensor();
Sensor *white_sensor = new Sensor();
Sensor *als_sensor = new Sensor();

VEML7700CustomSensor() : PollingComponent(15000) {}
void setup() override {
    Wire.begin();
    veml.begin();
    veml.setGain(VEML7700_GAIN_1);
    veml.setIntegrationTime(VEML7700_IT_800MS);
    // veml.powerSaveEnable(true);
    // veml.setPowerSaveMode(VEML7700_POWERSAVE_MODE4);
    // veml.setLowThreshold(10000);
    // veml.setHighThreshold(20000);
    // veml.interruptEnable(true);
}

void update() override {
    float lux = veml.readLux();
    float white = veml.readWhite();
    float als = veml.readALS();
    ESP_LOGD("VEML7700", "The value of sensor lux is: %.0f", lux);
    ESP_LOGD("VEML7700", "The value of sensor white is: %.0f", white);
    ESP_LOGD("VEML7700", "The value of sensor ALS is: %.0f", als);
    lux_sensor->publish_state(lux);
    white_sensor->publish_state(white);
    als_sensor->publish_state(als);
}
};

Sensor on falkp.no/blog

VEML7700 in ESPHome

# espnode.yaml

# veml7700_custom_sensor.h