Wemos D1 Mini and HC SR04 Ultrasonic Sensor - RTurala/Sonoff-Tasmota GitHub Wiki
HC-SR04 Ultrasonic Sensor
"This is the HC-SR04 ultrasonic ranging sensor. This economical sensor provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC-SR04 module includes an ultrasonic transmitter, a receiver and a control circuit." See HC-SR04 Ultrasonic Sensor for more information.
Buy example:
Connecting the HC-SR04 to a Wemos Mini D1
Wemos | HC-SR04 |
---|---|
GND | GND |
5V | VCC |
D6 (gpio12) | Echo via voltage divider |
D7 (gpio13) | Trigger |
The HC-SR04 operates best at 5V, therefore the echo signal will be 5V as well. Connecting the echo pin via a voltage divider (see schematic) will divide the 5V to 3.3V, which is the operation voltage of the Wemos D1 Mini.
Tasmota Configuration
In the Configuration -> Configure Module page, select the following:
- Module Type : 18 Generic
- D6 GPIO12 : 70 SR04 Ech
- D7 GPIO13 : 69 SR04 Tri
Tasmota Main
After reboot of the device the displays the HC-SR04 distance.