In this project, we will use GP2Y0A21 distance sense to measure distance between GP2Y0A21 and an obstacle object。The detectable distance range is 20cm to 150cm.
Parts and Devices：
Arduino UNO R3 x 1pc；
GP2YoA21 distance sensor x 1pc
3、Circuit connection graph：
Download project source code from following link:
Run above source code from Arduino IDE：
Open the serial terminal window in Arduino IDE upper right corner, you will see following result. The distance value will become large when obstacle is moving away from sensor.
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