Thanks for your response,
I did the reverse of Tx and Rx and immediately I got a quick flashing of the blue led. So It was a good start.
I have tried both 0x00 and 0x55, copied exactly as it is on the above posts. The funny thing was that I had a measurement in both cases although with unexplained lag and freezes. After last test with option 0x01, in your posted example, I cant see anything in the debug log or in ESPHome integration. The blue led still is flashing. In every change I did a complete reboot of the Home aasistant pc and the ESP32 board. Other sensors on the same ESP board, 3x dallas for temperature, are working flawlessly.
Here my config files:
/config/esphome/AJ_SR04M_Sensor.h
#include "esphome.h"
class AJ_SR04M_Sensor : public PollingComponent, public UARTDevice, public Sensor {
public:
AJ_SR04M_Sensor(UARTComponent *parent) : PollingComponent(5000), UARTDevice(parent) {}
// AJ_SR04M_Sensor format:
// Trigger: 0x00
// Response: Byte1 Byte2 Byte3 Byte4 Byte5
// Start Byte=FF MSB LSB Checksum (LSB+MSB) 00
void update() override {
char frame[5];
int pos = 0;
float value = 0.0;
write(0x00);
while (available()) {
frame[pos] = read();
pos++;
if(pos==5) {
if ((frame[0] == 0xFF) && (frame[4] == 0x00) && ((frame[1]+frame[2])==frame[3])) {
value = ((frame[1]<<8) + frame[2]) / 10.0;
publish_state(value);
}
break;
}
}
}
};
Ok,
I’m going to solder a 47KΩ at R19 for activating the “Low Power Serial Mode” and reverting with results.
What code should be changed if remaining into “Automatic Serial Mode”?
Edit1.This link is for the specific model that I have in my hands, labeled AJ-SR04M and resistors value is different than JSN-SR04T. I’m highlighting this for the sake of clarity.
Edit2. After the soldering of the 47KΩ at R19 the blue led is flashing every 5-6 seconds
I have try
write(0x00); not any indication in logs or in esphome
write(0x55); not any indication in logs or in esphome
write(0x01); not any indication in logs or in esphome
The two screen shots are the debug logs and the integration. the theird one is the history of the sensor. As you can see yesterday after soldering the resistor and trying x55 amd x00 was visible some measurements althouth with lag which situation I can reproduce anymore.
I’m trying various things,
first finding is that your config is different than tuxflo’s,
with yours I’m receiving distance athought with lag (does not matter if it is 47kΩ or 120)
Now recompilling with 01, reverting
Edit1. with 47kΩ, your posted config, with 0x01 is working, updating fast. Accuracy is a question, sometimes 10cm plus , other time ok.
** Edit2. If I’ll unplug the esp32 board from power supply then I have to reinstall/recompile the settings before having readings!!! Alternatively unlpug the Tx or Rx pin (very weird) **
See screenshot, 1)anything to improve it? 2) how to add a sensor with the quantity and %
no any chance to test the esp8266 board, the board type or the framework is not passing the validation, therefore no time or knowledge from my side for this anymore.
I went to the basement and removed one ESP32-cam for testing . I used the second sensor with this board and it was working flawlessly ! responding immediately after reboot, used pins
tx_pin: GPIO3
rx_pin: GPIO1
This made me suspicious for the pins of the initial board.
I have tried any combination of pins ESP32-WROOM-32U but the results were the same. No responding after a reboot unless remove the pin tx or rx of the sensor.
I have removed the dallas sensors from the ESP32-WROOM-32U but no change, issues after reboot is there.
I have removed everything related to dallas sensors from config. I have recompiled it, its working immediately after it (as usual) but not after reboot. WTF is the matter with this board?
Thanks for your patience!
I have exchange the sensors to the boards. Reboot issue only with ESP32-WROOM-32U.
The issue occuring with the particular board and I have no idea what could be!
The only reason that Im insisting with that board is the external antena that could be used with it due to the poor wifi coverage at the place of installation
Edit1. I got by express courier and on high price a D1 mini, delivered while ago, I did the same setup as ESP32-cam, in selected GPIO, in connections, in config file etc still have same results.
D1 min (as ESP32-WROOM-32U) when rebooting is not communicating with sensor unless remove the tx or Rx pin as kick start.
ESP32-cam is NOT working fine (anymore) after reboot!!! Not any more!
I did it again, no difference. It should be disconnect/reconect the tx or rx pin before resuming measurements. Its a mystery for me!
Other observation is the need for common source of power/grounding for a responsive sensor (before reboot).
I received the same sensor (AJ-SR04M) and I can’t get it to work. It shows no distance readings. I have been following this thread but to no avail. Can someone enlighten me where to put the AJ_SR04M_Sensor.h file. I was hoping to use it withou any resistor (to work just like the HC-SR04). Are there any changes to the code?
Hello - I found this post interesting - I’m starting to connect AJ-SR04M to my HA via esphome board : esp32 or wemos D1 mini
Have You considered voltages ?
I assume that You get 5v for AJ-SR04M from the board (esp32 or D1mini) but as far as I know TX/RX pins on these boards are working with 3.3v.
So If You connect TX/RX from SR04M You get 5v signal … and connecting it to 3.3v pins can cause damage or malfunction.
There is an instruction how to connect and there is a film presenting it is working but this example is based on Arduino UNO - there are 5v pin ! instructions film - arduino UNO working with AJ-SR04M
Hello everyone,
I am trying to reproduce this configuration on my Home Assistant via ESPHOME.
However, I have errors, and I’m more than new to Arduino.
My setup is a “Wemos D1 mini” with “JSN-SR04T” (AJ-SR04M) and 47KΩ residence on R19
In /homeassistant/esphome/
Here is my file AJ_SR04M_Sensor.h
#include "esphome.h"
class AJ_SR04M_Sensor : public PollingComponent, public UARTDevice, public Sensor {
public:
AJ_SR04M_Sensor(UARTComponent *parent) : PollingComponent(5000), UARTDevice(parent) {}
// AJ_SR04M_Sensor format:
// Trigger: 0x00
// Response: Byte1 Byte2 Byte3 Byte4 Byte5
// Start Byte=FF MSB LSB Checksum (LSB+MSB) 00
void update() override {
char frame[5];
int pos = 0;
float value = 0.0;
write(0x01);
while (available()) {
frame[pos] = read();
pos++;
if(pos==5) {
if ((frame[0] == 0xFF) && (frame[4] == 0x00) && ((frame[1]+frame[2])==frame[3])) {
value = ((frame[1]<<8) + frame[2]) / 10.0;
publish_state(value);
}
break;
}
}
}
};
Did you figure this one out? I’m very new to esphome so I’m really just trying anything an everything, but I’ve just got it working by removing the checksum comparison.
Wish I could say why that would be causing errors for me, but its the only way I’m getting any readings, and have been consistent and very accurate.