QTR-HD-31A Reflectance Sensor Array: 31-Channel, 4mm Pitch, Analog Output ESP32/ESP8281 The sensor communicates via either

The sensor communicates via either I2C or SPI

There's also a cut out to allow a 40-pin IDC cable to the GPIO breakout pins on the Pi and pass it though the case

Internal temperature compensation

one for Sub-GHz wideband Nagoya NA-773 telescopic antenna included and another 2

QTR-HD-31A Reflectance Sensor Array: 31-Channel, 4mm Pitch, Analog Output ESP32/ESP8281 The sensor communicates via eitherpitch sensors size (mm) output max current optimal range LEDs board 4mm31 125. 0 16. 5 analogous 30 mA 495 mA 5 mm This array of IR LED phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2. 9 V to 5. 5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the