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Mhz19-C CO2 sensor
Posted: 05 Mar 2022, 21:50
by pvhpsb
I have been using a number of Mhz19-B Co2 sensors with Espeasy for some time now to my complete satisfaction.
Now I have bought a Mhz19-C, but I can't get it to work, tried with various Espeasy relases.
I use a Wemos for this.
My question now is, are there other users with a working Mhz19-C?
Yours sincerely,
Patrick
Re: Mhz19-C CO2 sensor
Posted: 05 Mar 2022, 21:53
by TD-er
I still have it in my drawer to test. Not yet tested myself.
Do you have some log showing what might be wrong?
Re: Mhz19-C CO2 sensor
Posted: 06 Mar 2022, 09:42
by ManS-H
pvhpsb wrote: ↑05 Mar 2022, 21:50
I have been using a number of Mhz19-B Co2 sensors with Espeasy for some time now to my complete satisfaction.
Now I have bought a Mhz19-C, but I can't get it to work, tried with various Espeasy relases.
I use a Wemos for this.
My question now is, are there other users with a working Mhz19-C?
Yours sincerely,
Patrick
Yep, i'm working with the Mhz19-C. No problem at all. I use ESP_Easy_mega_20210223_normal_ESP8266_4M1M together with a Wemos.
Re: Mhz19-C CO2 sensor
Posted: 06 Mar 2022, 13:16
by TD-er
What voltage do you apply to the sensor?
The older versions were known to still work on voltages lower than 5V (e.g. 3V3) but their readings were for sure affected by it.
Not sure if the newer sensors still can be run on lower than specified voltages.
Re: Mhz19-C CO2 sensor
Posted: 06 Mar 2022, 15:43
by pvhpsb
Voltage is 5.1 Volt
Log with old release:
1022119: WD : Uptime 17 ConnectFailures 0 FreeMem 17640 WiFiStatus 3
1032095: MHZ19: Error, timeout while trying to read
1032096: MHZ19: Read error: checksum = 93 / 0 bytes read => 100/129/10/208/72/0/0/0/0/
1032097: MHZ19: Shifted 1 bytes to attempt to fix buffer alignment
1042105: MHZ19: Error, timeout while trying to read
1042106: MHZ19: Read error: checksum = 93 / 0 bytes read => 100/129/10/208/72/0/0/0/0/
1042106: MHZ19: Shifted 1 bytes to attempt to fix buffer alignment
Log with 20210223 release:
35956: MHZ19: Unknown response: 0 0 0 0 0 0 0 0 0
75957: MHZ19: Unknown response: 0 0 0 0 0 0 0 0 0
92203: WD : Uptime 2 ConnectFailures 0 FreeMem 19304 WiFiStatus 3
115956: MHZ19: Unknown response: 0 0 0 0 0 0 0 0 0
Checksum (pass/fail/reset): 0/0/1
Detected: ---
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