Ultrasonic Sensor Readings Accuracy lost after 15cm - Githubissues

NIAGroup / 2020_Arduino_Pi_IOT_Project

A remote access IOT project communicating via bluetooth between an Arduino & Raspberry Pi

MIT License

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Ultrasonic Sensor Readings Accuracy lost after 15cm #82

Closed NerdboyQ closed 3 years ago

NerdboyQ commented 3 years ago

The Technology

The Ultrasonic Sensor [model: HC-SR04] has a transmitter and a receiver
Ultrasonic sensors work like radar: they emit an ultrasonic pulse and wait for it to "bounce" off of a surface and back to the receiving end of the sensor. The delta in time from emitting to receiving provides a voltage reading to the Arduino to be calculated and converted into a distance reading.

Scenario:

The ultrasonic sensor is being used for detecting the distance of the ball.
The reading appear to be accurate from 3-15cm, but beyond that the measurements appear to be drastically inaccurate.

Considering switching sensor technologies from ultrasonic sensor -> Infrared Range finder.

Current workaround:

Limiting the balance range from 2-15cm. This is not sufficient.

NerdboyQ commented 3 years ago

Replaced this sensor with the SharpIR sensor; infrared based sensor. Provides much more consistent results.