STMicroelectronics X-NUCLEO-53L3A2 Expansion Board is a demonstration and development platform for the VL53L3CX Time-of-Flight Ranging Sensor with multi-target detection. The X-NUCLEO-53L3A2 expansion board includes two different glass cover windows. Three different spacers of 0.25mm, 0.5mm, and 1.0mm height can be fitted below the glass cover window to simulate various air gaps. The X-NUCLEO-6180A1 Expansion Board is compatible with the STM32 Nucleo board family and with the Arduino UNO R3 connector layout.