DEMO90121LR is a demonstration board from Melexis, a manufacturer of microelectronic products. It is designed to show the features and capabilities of Melexis MLX90621 infrared temperature sensor. This board consists of a single Melexis MLX90621, a 3.3V voltage regulator, a DC connector, a potentiometer and five jumpers, allowing for a more convenient connection to a device. It also has three LEDs, indicating the power status, data connectivity and a fault indicator. The demonstration board is provided with an I2C interfaced component and built-in compensation allowing the MLX90621 to accurately measure the temperature in the environment. It is suitable for many applications including automotive, industrial, medical and consumer electronics.