Wearable AC/Heater For Both Hot and Cold Environments

This wearable personal climate control and vital signs monitor is orchestrated by an Arduino Pro Mini microcontroller. The core of the temperature-regulating subsystem is a thermoelectric module, which utilizes the Peltier effect to either heat or cool depending on the direction of the electrical current flowing through it. Because thermoelectric modules draw significant current and require precise directional control, the Arduino interfaces with them via power MOSFETs acting as electronic switches, allowing variable power delivery. Thermal dissipation is managed by a small fan attached to the module to regulate heat transfer and prevent overheating on the hot face of the assembly. To monitor the user's biological feedback and ambient conditions, the system integrates an LM35 analog temperature sensor for precise thermal readings and a MAX30100 optical sensor communicating via I2C to capture pulse rate and blood oxygen levels. The entire electronics assembly is housed within a custom cardboard or 3D-printed enclosure secured by a wrist band or leather belt for comfortable wearable integration. Power is supplied by an onboard battery. Software-wise, the Arduino IDE is used to program the microcontroller logic—reading sensor thresholds and adjusting MOSFET outputs—while the Kodular App Builder facilitates custom mobile application development for remote monitoring and user interface control over wireless communication.