peyo22 / Aranet4-ESP32

Aranet4 ESP32 client

Aranet4 ESP32 client

This library allows you to read data from Aranet4 devices using Bluetooth.

Requirements

To save memory, this library is using NimBLE bluetooth stack. Install it from library manager or get it here: h2zero/NimBLE-Arduino

Usage example

1. Create bluetooth callback, to allow pairing. In this example, when PIN is requested, you must enter it in serial console:

class MyAranet4Callbacks: public Aranet4Callbacks {
    uint32_t onPinRequested() {
        Serial.println("PIN Requested. Enter PIN in serial console.");
        while(Serial.available() == 0)
            vTaskDelay(500 / portTICK_PERIOD_MS);
        return  Serial.readString().toInt();
    }
};

2. Initialize ESP32 bluetooth device and security profile in setup() function:

Aranet4::init();

3. Connect to device and read data:

String addr =  "00:01:02:03:04:05";
Aranet4 ar4(new  MyAranet4Callbacks());
...
bool secure = true;

if (ar4.connect(addr, secure) == AR4_OK) {
    AranetData data =  ar4.getCurrentReadings();
	Serial.printf("CO2: %i ppm\n", data.co2);
	Serial.printf("Temperature: %.2f C\n", data.temperature  /  20.0);
	Serial.printf("Pressure: %.1f C\n", data.pressure  /  10.0);
	Serial.printf("Humidity: %i  %%\n", data.humidity);
	Serial.printf("Battery: %i  %%\n", data.battery);
	Serial.printf("Interval: %i s\n", data.interval);
	Serial.printf("Ago: %i s\n", data.ago);
} else {
    Serial.println("read failed");
}
ar4.disconnect();

You can set bool secure=false;, if Aranet4 is running v1.2.0 or later, with Smart Home Integrations enabled. This will skip pairing process. However, you will be only available to use getCurrentReadings() function. Geting history still requires device pairing/secure mode.

Measurement data is stored in original binary format. This means temperature must be divided by 20 and pressure must be divided by 10 to get correct values.