How to get CO2 controler with Sonoff ? Any projects on this topic?
SONOFF didn’t make any CO2 monitor devices for now, I thinks another option is searching a CO2 monitoring devices on aliexpress that eWeLink supported or works with eWeLink/SONOFF ZigBee bridge considering most of the sensor are ZigBee protocol.
There is no such.
Nov 2022
Only zigbee devices that have a compatible native analogue will work with native firmware in the native program (and even then not always).
I have two cheap CO2 monitors. Bare in mind it is impossible to get an accurate CO2 measurement cheaply, so if you really want to know the CO2 for sure prepare to spend money. You can get infrared CO2 monitors that result in MQTT messages which the iHost/NS Panel Pro can see, but that is quite a big project so probably only suitable for a collection of schools, hospital or university etc.
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Or LoRaWAN, for example:
I have two cheap wireless and one dumb CO2 monitors and the accuracy is poor. I don’t think they actually measure CO2. They measure VOC (volatile organic carbon) and then do some magic to create a CO2 number.
The more expensive LoRaWAN types use infrared and I think are more accurate. Pretty sure a standard base station for LoraWAN can send out MQTT messages that an iHost or NS Panel Pro could read. That is how I would do it if I wanted CO2 levels that were accurate as they’re used in agriculture etc.
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@Daniel_Zhan Any plan from Sonoff on this product category?
None, you still need a base station and most of these will send MQTT messages over your usual internet LAN to the iHost or NSPP Pro. The frequencies depend where you live in the world. Here it is 868. 433 is everywhere but not so far and you are less likely to be able to use other people’s base stations to go about as most people use the frequencies about 900. Personally I’d just go for number near 900 that is allowed in my country.
https://www.chirpstack.io/docs/chirpstack/integrations/mqtt.html
I don’t think there is much chance of Sonoff using LoRaWAN as it’d be yet another chip and add to the price too much. I think it’d make sense for them to collaborate with a manufacturer of that system so if it was needed some of their devices could work over longer distances than is permitted by Zigbee or Wifi. The standard way to attach hobby Lorawan devices is with an ESP 32 development board anyway so I doubt it would take that much. I think the manufacturers I think of immediately are all in China anyway:
RAK Wireless
Seeed Studio
Dragino
Bit overkill for most domestic users though. Think the world record is about 900Km, but that was in a flat country with a balloon. It’d be more useful say if you owned a farm and an iHost and wanted to track soil moisture or if you’ve shut a farm-gate for the horses etc.
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