Example code that shows how to interface an Arduino to Useful Sensor's Person Sensor board over I2C.
The Person Sensor is a small hardware module that's intended to make it easy to find out when people are near a device, where they are, and who they are. It has an image sensor and a microcontroller with pretrained ML models that use computer vision to spot faces.
There's a detailed developer guide available, but this project has sample code that shows you specifically how to get the sensor up and running with the Arduino IDE. It has been tested with the Arduino Nano BLE Sense board, but uses standard APIs and should hopefully be compatible with other platforms.
Open the person_sensor_arduino.ino file in the Arduino IDE, and press upload
to build and flash the example onto your board.
You'll need to consult your board's documentation to find out what the pins or connectors used for the I2C interface are. Ideally you should find a board or breakout that supports a standard connector like Qwiic or Grove, so you can attach a cable from the sensor's Qwiic port.
Once you have the sensor wired in, and the sketch flashed, you should start to see information about the faces it spots, or error messages. If you hold the sensor so that it's pointing at your own face you should see output like this in the Serial Monitor:
********
1 faces found
Face #0: 99 confidence, (68, 71), 136x193, facing
This shows that the sensor has found one face, with a 136 by 193 bounding box, with the top-left corner at 68, 71, and the head is pointing directly towards the sensor.
The first thing to check is that the sensor is receiving power through the
VDD and GND wires. The simplest way to test this is to hold the sensor
upright (so the I2C connector is at the top) and point it at your face. You
should see a green LED light up. If you don't see any response from the LED then
it's likely the sensor isn't receiving power, so check those wires are set up
correctly.
