---+ The HC-SR04 ultrasonic distance meter The [[https://netsonic.fi/en/files/HCSR04-datasheet.pdf][HC-SR04 ]]emits an ultrasonic sound wave and measures the time it takes to travel to a target and back. Knowing that sound waves travel at 330m/s the distance between the sensor and the target can be calculated The cabling is done as described in the following table | *TCS3200* | *!WeMos bus* | *GPIO* | | Vcc | 5V | | | TRIG | D2 | 21 | | ECHO | D1 | 22* | | GND | GND | | * Because the signal emitted by the HC-SR04 has a 5V level and the ESP32 CPU accepts only 3.3V signals, the ECHO signal is passed through a 1kOhms / 2kOhms voltage divider. -- %USERSIG{UliRaich - 2022-05-30}% ---++ Comments %COMMENT%
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Topic revision: r1 - 2022-05-30 - UliRaich
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