Help with AM2302 sensor

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Alex

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Jul 8, 2021, 1:13:12 AM7/8/21
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Hi I am trying to make my own temperature and humidity sensor using this:
and this:
On the esp8266 module i have flashed tasmota sensors 9.5 and i have connected the sensor to it in this way:
"sensor -" to gnd pin on esp8266
"sensor +" to 3.3v pin on esp8266
"sensor out" to io2 pin on esp8266
Tasmota is working on the esp8266 and I have set it as Generic module with gpio2 as AM2301. However I am getting only null values for temperature and humidity(both on the main tasmota page and in the console for tele/xxxx/SENSOR)
Thinking that 3.3v might be too little for the sensor I have supplied direct 5V power to it instead of taking it from the esp8266 but I still get only null values.
Can someone help me with setting up the sensor? What am I doing wrong?
Thank you

Philip Knowles

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Jul 8, 2021, 3:58:30 AM7/8/21
to TasmotaUsers, Alex
GPIO2 is not a good choice for i/o. It's connected to the onboard LED.
Perhaps try a different GPIO.

Regards

Phil K

From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Alex <yordanov....@gmail.com>
Sent: Thursday, July 8, 2021 6:13:12 AM
To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Help with AM2302 sensor
 
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andre...@gmail.com

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Jul 8, 2021, 4:24:40 AM7/8/21
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I just tested this on an ESP-01, using IO2, all 3.3V, and it works for me.
Also, I confirm it works on IO0.
Maybe do some tests with a multimeter to check connections all the way through to the AM2301.

benjam...@t-online.de

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Jul 8, 2021, 6:05:07 AM7/8/21
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Is there a pullup between Vcc and Data pin? 4.7k or 10k will do.

Philip Knowles

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Jul 8, 2021, 8:11:58 AM7/8/21
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GPIO2 has an inbuilt pullup but is driven high on boot. As I said on some devices GPIO2 is attached to the LED which may cause issues for 1-wire

 

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From: benjam...@t-online.de
Sent: 08 July 2021 11:05
To: TasmotaUsers
Subject: Re: Help with AM2302 sensor

 

Is there a pullup between Vcc and Data pin? 4.7k or 10k will do.

andre...@gmail.com schrieb am Donnerstag, 8. Juli 2021 um 10:24:40 UTC+2:

I just tested this on an ESP-01, using IO2, all 3.3V, and it works for me.

Also, I confirm it works on IO0.

Maybe do some tests with a multimeter to check connections all the way through to the AM2301.

On Thursday, July 8, 2021 at 8:58:30 AM UTC+1 knowles...@gmail.com wrote:

GPIO2 is not a good choice for i/o. It's connected to the onboard LED.

Perhaps try a different GPIO.

Regards

Phil K

From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Alex <yordanov....@gmail.com>
Sent: Thursday, July 8, 2021 6:13:12 AM
To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Help with AM2302 sensor

 

 

Hi I am trying to make my own temperature and humidity sensor using this:

and this:

On the esp8266 module i have flashed tasmota sensors 9.5 and i have connected the sensor to it in this way:

"sensor -" to gnd pin on esp8266

"sensor +" to 3.3v pin on esp8266

"sensor out" to io2 pin on esp8266

Tasmota is working on the esp8266 and I have set it as Generic module with gpio2 as AM2301. However I am getting only null values for temperature and humidity(both on the main tasmota page and in the console for tele/xxxx/SENSOR)

Thinking that 3.3v might be too little for the sensor I have supplied direct 5V power to it instead of taking it from the esp8266 but I still get only null values.

Can someone help me with setting up the sensor? What am I doing wrong?

Thank you

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Alex

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Jul 8, 2021, 10:52:58 AM7/8/21
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I have tried IO0, RX and TX pins but i am getting null on all of them
The connections seem ok: between + and - on the sensor I am getting 3.3V. I also get 3.3V between - and out pins on the sensor
I have set More debug on the Web log level and I am getting the message: DHT: Timeout waiting for start signal low pulse

Philip Knowles

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Jul 8, 2021, 11:50:22 AM7/8/21
to Alex, TasmotaUsers

If it’s the version with the wires It’s worth looking at the pins inside the sensor housing I had a couple with yellow and black misconnected.

What pullup resistor do you have connected between Vcc and Signal.?

 

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Alex

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Jul 8, 2021, 12:45:54 PM7/8/21
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Even if I looked inside the sensor housing I am not sure I would have enough knowledge to understand if they are misconnected :)
I have no pullup resistors - I assumed it was a straight connection - I thought everything needed was on the board the sensor is on.
An the page on the tasmota site doesn't mention any resistors(https://tasmota.github.io/docs/AM2301/)
Can you point me to a schematic how should I connect the sensor
Thank you

Philip Knowles

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Jul 8, 2021, 2:21:09 PM7/8/21
to Alex, TasmotaUsers

DS18x20 temperature sensor - Tasmota

The AM/DHTs are 1-wire devices

Most things like switches etc need pullup resistors between the GPIO and Vcc

Alex

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Jul 9, 2021, 2:44:51 AM7/9/21
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I have tried with 4.7k and 10k resistors between + and  out pins but I am still getting nulls. I have even opened the housing of the sensor and after seeing the markings there I have connected directly to the sensor pins but still all I get are nulls
I am starting to think I am doing something wrong in Tasmota... Can someone show me the settings needed in Tasmota.
@andrew you wrote that you have tried it and it works can you send me the schematic and Tasmota settings that you used?
Thank you

andre...@gmail.com

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Jul 9, 2021, 3:43:39 AM7/9/21
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I suspect you have a bad AM2302.

Here is exactly what I did:
Use an ESP-01
Use Tasmotizer to erase and install tasmota.bin 9.5.0. Set WiFi, get IP and connect from browser.
From the browser:
Configure GPI02 = AM2301 Save (reboot)
I now see Temperature/Humidity/DewPoint on the web interface. All show null.
Attach GND, Vcc and Data from the AM2302 to the ESP-01, and the  Temperature/Humidity/DewPoint show numbers.
Note: My AM2302 is on a breakout board that has a built-in 10K between Data and Vcc. Looking at the picture of yours on Amazon, I think yours has a 10K too.

Behavior:
If I remove the data wire, the values go to null in about 20sec. If I replace the data wire, the values appear in about 2sec.

Something you can try to get confidence in your ESP-01/Tasmota/GPIO2:
Remove the AM2302.
Configure GPIO2 = Switch, 1. Save (reboot)
On the main page, you will probably see "OFF".
Connect GPIO2 to Vcc, you will see "OFF".
Connect GPIO2 to GND, you will see "ON". It takes about 1sec for the text to change.






Philip Knowles

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Jul 9, 2021, 4:37:17 AM7/9/21
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Alex

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Jul 9, 2021, 6:23:01 AM7/9/21
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Looks like the settings are the same except that I use Generic module and tasmota-sensors (although the first version I tried was the regular tasmota, but then I saw here https://tasmota.github.io/docs/AM2301/ " This feature is included only in tasmota-sensors.bin" so I flashed tasmota-sensors).
@andrew the switch test is working, and it seems that I have connected the sensor the same way you did. On the board there is a 3.3k resistor which seems to be between the out pin and one of the pins on the sensor(I can't follow the path to which one exactly) and what seems to be a diode between the - on the board and the + on the sensor.
As for the sensor being bad - I have 3 of these and they all give me null values. I find it hard to believe that they are all broken...
Nevertheless unless someone has an idea what is wrong I think I'll buy another sensor from somewhere else and try it.
Looking at the reviews on the amazon page the top two reviews say that they don't work :). However another review says:
" if you are plugging these into ESP32 or ESP8266 and using ESPHome for Home Assistant (Hassio) then make sure you get a more recent version of ESPHome. At time of writing I had to add the link to the Beta (1.15.0b3) into my repository list in Home Assistant then change the YAML to have a model of DHT22_TYPE2"
Anyone know what is this DHT22_TYPE2 and does it have an equivalent in tasmota?

Philip Knowles

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Jul 9, 2021, 6:59:52 AM7/9/21
to Alex, TasmotaUsers

This is the place to start with what’s in the different builds

Tasmota/BUILDS.md at development · arendst/Tasmota (github.com)

The AM2301 and DHT11 are essentially the same and the AM2302 and DHT22 are the same.

 

Looking at the Amazon page there is a 10k resistor on the board near the -ve pin and there’s a capacitor on the other side. I’m not entirely convinced the pins are labelled correctly as the track looks like it goes from 0V to R1. If you have a multimeter you could check. If not, it may be worth swapping 3.3V and 0V for a few seconds and see what happens. The devices generally are tolerant of misconnections

 

Regards

 

Phil K

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From: Alex
Sent: 09 July 2021 11:23
To: TasmotaUsers
Subject: Re: Help with AM2302 sensor

 

Looks like the settings are the same except that I use Generic module and tasmota-sensors (although the first version I tried was the regular tasmota, but then I saw here https://tasmota.github.io/docs/AM2301/ " This feature is included only in tasmota-sensors.bin" so I flashed tasmota-sensors).

@andrew the switch test is working, and it seems that I have connected the sensor the same way you did. On the board there is a 3.3k resistor which seems to be between the out pin and one of the pins on the sensor(I can't follow the path to which one exactly) and what seems to be a diode between the - on the board and the + on the sensor.

As for the sensor being bad - I have 3 of these and they all give me null values. I find it hard to believe that they are all broken..

Nevertheless unless someone has an idea what is wrong I think I'll buy another sensor from somewhere else and try it.

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Alex

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Jul 9, 2021, 7:33:49 AM7/9/21
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The image where the resistors are seen does not correspond to the real product that I have received :) R2 and Q2 are not there at all and the resistor is marked 512 which should be 5.1K(although as I wrote I have measured it at 3.3K)
The guy I quoted says that these sensors didn't work before ESPHome v 1.15.0b3 and then he had to choose DHT22_TYPE2 not DHT22. So I was thinking that this is some variation on the  DHT22 sensor that requires some code changes in tasmota to work...

Philip Knowles

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Jul 9, 2021, 7:57:55 AM7/9/21
to Alex, TasmotaUsers

The resistor may still be 5k1 as the sensor will be in parallel with it. It’s value isn’t as important as the resistance between each of it and the pins. There should be 0 ohms between 1 end and out and 0 ohms from the other end and +ve.

AM2302 has been specifically supported since 2018. There was a change to the code in March 2020 to cope with some timing issues on the DHT22. There was also a pull request to the code 2 weeks ago to cope with some specific issues

Update xsns_06_dht.ino by amunra68 · Pull Request #12488 · arendst/Tasmota (github.com)

 

I’d check the wiring first

Alex

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Jul 9, 2021, 8:25:51 AM7/9/21
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I just checked the resistance and it is indeed 0 ohms between one end and out pin and 0 ohms between the other end and the + pin
Is that what you meant by checking the wiring?
If you mean between the esp8266 and the sensor - I have already checked these and they are ok
I have also checked the connection between the pins on the board and the pins on the sensor itself and they too seem to be connected correctly(if I believe the markings on the sensor itself)

Philip Knowles

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Jul 9, 2021, 9:06:07 AM7/9/21
to Alex, TasmotaUsers

OK. So the connections are correct. Then it’s either the firmware or the ESP8266.

 

I’d try the development binary from here

ota.tasmota.com/tasmota/

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Andrew Russell

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Jul 9, 2021, 9:36:10 AM7/9/21
to Philip Knowles, Alex, TasmotaUsers
FYI - my AM2302 is at least 4 years old.

To view this discussion on the web, visit https://groups.google.com/d/msgid/sonoffusers/7AD97BD5-0184-4A80-8845-4B067426DFA7%40hxcore.ol.

Alex

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Jul 13, 2021, 2:34:32 AM7/13/21
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Sorry for the silence - I have been out of town for a couple of days and after that I waited for an AM2302 sensor that I ordered locally.
Everything worked immediately after I connected the new sensor... I haven't tried the dev binary yet with the non working sensors. Has anything been done concerning AM2302 in the dev? If not I don't see any point in flashing that... But if you think it might work I will try it.
From my point of view however and considering the comments on the Amazon page I think that I have a variation of the DHT22 sensor that requires some code changes and is not yet supported by Tasmota. Anything I can do to test that?
Thank you

Philip Knowles

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Jul 13, 2021, 4:08:47 AM7/13/21
to TasmotaUsers, Alex
There were some code changes affecting DHT22 12 days ago. Might not resolve it but you never know.

Sent: Tuesday, July 13, 2021 7:34:32 AM
To: TasmotaUsers <sonof...@googlegroups.com>

Alex

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Jul 14, 2021, 1:08:22 AM7/14/21
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Today I tried the dev version:
Program Version      9.5.0.2(sensors)
Build Date & Time    2021-07-13T15:51:24
Unfortunately with the same result - everything is null

Philip Knowles

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Jul 14, 2021, 1:26:12 AM7/14/21
to TasmotaUsers, Alex
I suspect they may be faulty. The log entry showed an error waiting for the start. The code change was about a timing issue for the start.
I can't remember. Did they work on another device? If they did raise an issue on GitHub and post your log data

Sent: Wednesday, July 14, 2021 6:08:22 AM

Alex

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Jul 14, 2021, 2:11:33 AM7/14/21
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"DHT: Timeout waiting for start signal low pulse" is the message
I have now tried all 3 sensors on two different  ESP-01S boards.
I find it hard to believe that all 3 sensors are faulty.
I will try using ESPHome to confirm that they work. However I have never used that and it might take some time until I find out how to do it

Alex

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Jul 16, 2021, 1:20:29 AM7/16/21
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After trying a lot of options in ESPHome none worked. So I am giving up - I can no longer find an explanation other that all the sensors are faulty
Thank you for the help

Philip Knowles

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Jul 29, 2021, 5:45:09 AM7/29/21
to Alex, TasmotaUsers

Tested the sensor on node-red on a Raspberry Pi. This is the result.

On a nodemcu running v9.5.0 (tried with and without a pullup resistor) – same with an ESP32

Definitely looks like a bug within Tasmota

 

Regards

 

Phil K

 

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From: Alex
Sent: 16 July 2021 06:20
To: TasmotaUsers
Subject: Re: Help with AM2302 sensor

 

After trying a lot of options in ESPHome none worked. So I am giving up - I can no longer find an explanation other that all the sensors are faulty

Thank you for the help

 

On Wednesday, July 14, 2021 at 9:11:33 AM UTC+3 Alex wrote:

"DHT: Timeout waiting for start signal low pulse" is the message

I have now tried all 3 sensors on two different  ESP-01S boards.

I find it hard to believe that all 3 sensors are faulty.

I will try using ESPHome to confirm that they work. However I have never used that and it might take some time until I find out how to do it

On Wednesday, July 14, 2021 at 8:26:12 AM UTC+3 knowles...@gmail.com wrote:

I suspect they may be faulty. The log entry showed an error waiting for the start. The code change was about a timing issue for the start.

I can't remember. Did they work on another device? If they did raise an issue on GitHub and post your log data

Sent: Wednesday, July 14, 2021 6:08:22 AM


To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Re: Help with AM2302 sensor

Today I tried the dev version:

Program Version      9.5.0.2(sensors)

Build Date & Time    2021-07-13T15:51:24

Unfortunately with the same result - everything is null

On Tuesday, July 13, 2021 at 11:08:47 AM UTC+3 knowles...@gmail.com wrote:

There were some code changes affecting DHT22 12 days ago. Might not resolve it but you never know.

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Alex

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Jul 31, 2021, 1:42:55 AM7/31/21
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@Phil K thank you this gives me hope that some day I'll be able to use my remaining two sensors :) What to do now? File a bug for Tasmota? Could you do that - you know better Tasmota and I think you will be able to better describe the issue and run any needed tests... or should I do it?
Thank you

benjam...@t-online.de

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Jul 31, 2021, 3:24:45 AM7/31/21
to TasmotaUsers
I have a few AM2302 sensors and they work perfectly with Tasmota. Any issues with intermittent null values I experienced have been ironed out over time. So I doubt it's a problem of Tasmota.
Why do you worry so much about two defective sensors for 12€? I would write them off and get new ones. 

Philip Knowles

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Jul 31, 2021, 4:53:10 AM7/31/21
to benjam...@t-online.de, TasmotaUsers

Please read the thread. I have tested a ‘defective’ AM2302 on a Raspberry Pi (running node-red) and it works fine on that. I have read the issue thread on the AM2302 and I tried it with an ESP8266 and ESP32 and with and without pullup resistors with no success.

 

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From: benjam...@t-online.de
Sent: 31 July 2021 08:24
To: TasmotaUsers
Subject: Re: Help with AM2302 sensor

 

I have a few AM2302 sensors and they work perfectly with Tasmota. Any issues with intermittent null values I experienced have been ironed out over time. So I doubt it's a problem of Tasmota.

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Philip Knowles

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Jul 31, 2021, 4:54:07 AM7/31/21
to Alex, TasmotaUsers

I‘ll look at the existing issue and probably add to it.

Philip Knowles

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Aug 1, 2021, 4:20:11 PM8/1/21
to benjam...@t-online.de, TasmotaUsers

I have now tried using this

projetsdiy/esp8266-dht22-mqtt-home-assistant: ESP8266 + DHT22 + MQTT + Home-Assistant (github.com)

and this works perfectly on an ESP8266 (without needing a pullup resistor) with the AM2302 connected to D4/

I then downloaded the latest Tasmota dev version and flashed and configured the ESP8266 using the same pin and this is the result

Same board, same sensor = Tasmota bug

Tasmota appears to be using the ESPEasy library (not the Arduino one) so I tried ESPEasy too. That didn’t work either.

 

Regards

 

Phil K

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Flavio Inge

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Oct 31, 2021, 5:20:05 AM10/31/21
to TasmotaUsers
Often module AM2301 use the protocol of SI7021. Tray to use the protocol  SI7021 on GPIO2
Regards

Philip Knowles

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Oct 31, 2021, 6:23:36 AM10/31/21
to Flavio Inge, TasmotaUsers
Please read the thread. It's a AM2302 that's the issue and it worked until a change in Tasmota
From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Flavio Inge <flavio....@gmail.com>
Sent: Sunday, October 31, 2021 9:20:05 AM

To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Re: Help with AM2302 sensor
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Phil Gilbert

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Nov 9, 2021, 11:10:28 AM11/9/21
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It may be a Tasmota fault, but .....
I'm running 9.1 on a Sonoff Mini with an AM2301 connected red=5V, black=gnd, yellow=GPI02 with 4.7k pull up.
2021-11-09 16.07.29.jpg
When I set GPI02 to AM2301, I get three null values.
However when I set it to SI7021 it works.
AM2301.png

Philip Knowles

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Nov 9, 2021, 1:14:23 PM11/9/21
to Phil Gilbert, TasmotaUsers
There's a timing issue with the AM2302 which may have been resolved in V10. No guarantees.

Regards

Phil K
From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Phil Gilbert <phil.gi...@gmail.com>
Sent: Tuesday, November 9, 2021 4:10:27 PM

Phil Gilbert

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Nov 12, 2021, 5:35:29 AM11/12/21
to Philip Knowles, TasmotaUsers
I tried upgrading from v9.1 to v10.0 but it's just the same. Won't work at all as AM2301 still working initially as SI7021. 
2021-11-09 16.07.29.jpg
AM2301.png

Philip Knowles

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Nov 12, 2021, 6:14:05 AM11/12/21
to Phil Gilbert, TasmotaUsers

Are you sure it’s an AM2301 and not an AM2302 – as you jumped on to an AM2302 thread? The SI7021 is equivalent to the AM2302.

 

Regards

 

Phil K

 

Sent from Mail for Windows

 

From: Phil Gilbert
Sent: 12 November 2021 10:35
To: Philip Knowles
Cc: TasmotaUsers
Subject: Re: Help with AM2302 sensor

 

I tried upgrading from v9.1 to v10.0 but it's just the same. Won't work at all as AM2301 still working initially as SI7021. 

 

On Tue, 9 Nov 2021, 18:14 Philip Knowles, <knowles...@gmail.com> wrote:

There's a timing issue with the AM2302 which may have been resolved in V10. No guarantees.

Regards

Phil K

 

From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Phil Gilbert <phil.gi...@gmail.com>
Sent: Tuesday, November 9, 2021 4:10:27 PM
To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Re: Help with AM2302 sensor

 

It may be a Tasmota fault, but .....

I'm running 9.1 on a Sonoff Mini with an AM2301 connected red=5V, black=gnd, yellow=GPI02 with 4.7k pull up.

When I set GPI02 to AM2301, I get three null values.

However when I set it to SI7021 it works.

 

On Sunday, 31 October 2021 at 10:23:36 UTC knowles...@gmail.com wrote:

Please read the thread. It's a AM2302 that's the issue and it worked until a change in Tasmota

Phil Gilbert

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Nov 12, 2021, 11:07:46 AM11/12/21
to TasmotaUsers
Yes. Sorry I jumped in the AM2302 thread, but the content seemed to be very close to my experiences with the AM2301.
I don't know what the difference between the 2301 and 2302 are, but mine says AM2301 on the case (see earlier photo)

Philip Knowles

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Nov 12, 2021, 12:07:43 PM11/12/21
to Phil Gilbert, TasmotaUsers

No worries.

The AM2301 is equivalent to the DHT11 & DHT21

The AM2302 is equivalent to the DHT22 and the SI17021

If your device is working as SI1702 it may likely be an AM2302 inside.

When I set GPI02 to AM2301, I get three null values.

However when I set it to SI7021 it works.

 

On Sunday, 31 October 2021 at 10:23:36 UTC knowles...@gmail.com wrote:

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