The Obstacle Detector sensor module is perfectly adaptable to the environment light, IR Object Avoidance Sensor has a pair of infrared transmitting and receiving tubes; transmitting tube emits infrared in a certain frequency, when detecting direction meets with obstacles(reflecting surface), reflected infrared will be received by the receiving tube; after the comparator circuit processing, the green indicator will light up, at the same time signal output interface to output digital signal(1 low-level signal). Users can adjust the detection distance through the potentiometer knob, effective distance range 2~30cm and working voltage is 3.3V to 5V. The Obstacle Avoidance module LM393 can be widely used in robot obstacle avoidance, obstacle avoidance car, line count, black and white line tracking, and so on many occasions.

This AT-09 HM10 / HM-10 4.0 BLE Bluetooth Serial CC2540 CC2541 Module For IOS 6/Android 4.3 contains a BLE chip (a CC2540/CC2541). This AT-09 HM-10 Bluetooth Module allows performing serial communication with the BLE chip thanks to an Rx and a Tx pin. This 4.0 Bluetooth Serial Module is also very similar to the HM-10 module and is also compatible with it. So if you have some experience with the latter, you will get started quickly with the AT-09.