Tasmota: SR04 Ultrasonic sensor support?

[Killobite]

First off, fantastic firmware! I have installed this firmware on more than 20 Sonoffs and am really appreciating the capabilities and attention to detail!

I do find that I would really like to add the use of a SR04 distance sensor for one of my implementation and am wondering if there may be any plan or ideas on how to do so?

Thanks!

[arendst]

The SR04 needs 5V. Sonoff can only supply 3V3. Do you expect the SR04 to work reliably on 3V3?

[AlexTransit]

Sonoff basic - use 2 power
5v - via trancformater (power relay)
3.3v - afrer stabiliser

[Killobite]

I will actually be using it with a Wemos D Mini and can take the 5V right off the VCC pin. I have a mock up working with 3.9.21 and just threw the sonar code in the void loop and sent the output to serial. I started to dig into an "easy" way to publish the distance into MQTT but that's when I thought I would reach out and see if anybody has any plan/code on it. I had to put a little millis delay in to get it to read correctly and only report out if the distant changes by more than 10 inches but it works reliably, I just have to figure out hot to make it pretty for the web interface and MQTT output.

My use case is a garage door control with open/closed (distance) indicator and a sump pump monitor/override with water level (distance) logging.

Here is my simple loop code in case you are interested:
if (millis() >= lMillis + 250) {

  lMillis = millis();
  sDistNew = Ultrasonic.distanceRead(INC);

  if (sDistNew > sDist + 10 ){
    sDist = sDistNew;
    Serial.print("Distance in Inches: ");
    // Pass INC as a parameter to get the distance in inches
    Serial.println(sDist);
    //delay(1000);
  }
  else{
      if (sDistNew < sDist - 10 ){
      sDist = sDistNew;
      Serial.print("Distance in Inches: ");
      // Pass INC as a parameter to get the distance in inches
      Serial.println(sDist);
      //delay(1000);
  }
 }

}

[f0m3]

Thats a cool idea. Id like to use the sonoff dual for my garage door control but id like to know if it is open or closed too...

[hamwong]

Wish SR04/05 will support in sonoff, power should not be the reason make SR04 not add as SR501 also use 5V

[quadflight]

Great idea. Did you get it to work?

[BernardLaurenzo]

The sonoff dev board has 5v
Im currently running my SR04 and sonoff dev with ESP easy firmware

[jetema]

Yes, 5 volts are available on D5 ( zenner diode in the middle of the pic ) terminals, you can get a few extra mA from this point to supply SR04

[Gompka]

You can also use this sensor https://www.bananarobotics.com/shop/US-100-Ultrasonic-Distance-Sensor-Module as it runs on 3.3v

[nosaj66au]

Hi Guys,
has this gone any further I required it for rain water tank level

Jason

[fragolinux]

HC-SR04P can work at 3.3V, you can recognize it because usually is blue as the other model, but has NO crystal oscillator on the front panel, look at image

[scottchristian]

I'm going to throw my request for this as well.
Would be very nifty

[Frogmore42]

Well you are in luck.
https://github.com/arendst/Sonoff-Tasmota/wiki/Wemos-D1-Mini-and-HC-SR04-Ultrasonic-Sensor

[ascillato]

Now it is implemented. Closing.

[ascillato]

?

[rajil]

@Gompka I found the manual for US-100 here. Does this device work with 3.3V?

[Gompka]

Yea it does, I have been using it for over a year.

[rajil]

@Gompka I tried to use PingSerial library with US-100 but that did not work. Do you have any example code which works on nodemcu?

[Gompka]

@rajil, did you make sure the jumper on the back of the us-100 is in the correct position? I do not have any code, but I am using the sensor with wemos d1 with opengarage. You can check the opengarage project for some code examples.

[rajil]

@Gompka I was able to get it working after taking off the jumper. Is it possible to hook two ultrasonic sensors on the same ESP8266. In Tasmota 'configure module' 73/74 device type is Trigger/Echo. I assigned these to two devices, but only one device showed up.