Contactless Smart IR Thermometer using Arduino and Android

The Contactless Smart IR Thermometer is built around an Arduino Nano microcontroller that acts as the central processing unit for temperature data acquisition. To measure temperature without physical contact, the system uses an MLX90615 infrared temperature sensor, which detects the infrared energy emitted by an object or person and translates it into a digital temperature value. Additionally, a TCRT5000 IR sensor is integrated into the hardware setup to detect the close presence of a user, signaling the device when to initiate a measurement. The electronic components are hand-assembled and soldered onto a perf board to create a compact, stable circuit. Once powered, the Arduino Nano processes the sensor inputs and communicates the readings outward. By connecting the Arduino Nano to an Android smartphone using a USB OTG cable, temperature data can be transmitted directly to the mobile device. Users run the Easy Scan Android Application APK, which interfaces with the hardware, receives the incoming data, and allows the operator to view, log, and share the temperature readings alongside pictures. The entire custom electronics circuit and smartphone docking mechanism are housed inside a neat 3D printed enclosure, making it portable and easy to deploy for everyday temperature screening applications.