Objective:

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:

GP2Y0A02_1_bb

Download project source code from following link:

GP2Y0A02

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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