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> Unfortunately, when I last looked, I couldn't find any consumer-grade sensors which used dual-NDIR sensors, only more expensive and less aesthetic commercial
by scottlamb 4y ago
> Unfortunately, when I last looked, I couldn't find any consumer-grade sensors which used dual-NDIR sensors, only more expensive and less aesthetic commercial sensors. In the end I built my own using a CDM7160 sensor connected via I2C to a ESP8266, which reports over MQTT.
Looks like that's been discontinued. [1] Any advice for folks trying to build one now?
[1] https://www.figarosensor.com/topic/2020/11/Discontinuance-of-CO2-Sensor-CDM7160.html https://www.figarosensor.com/topic/2020/11/Discontinuance-of...
- abirkill 4y agoThat's a shame, they've worked well for me. Unfortunately I can't recommend any others without doing some research, I found quite a few dual-NDIR sensor modules when I was looking and chose this one primarily based on availability and a reasonable datasheet. A sibling post[1] mentioned a sensor that is listed as being dual-NDIR so should give reliable readings, and has a USB interface, so that sounds like one possibility. [1] https://news.ycombinator.com/item?id=32122301 https://news.ycombinator.com/item?id=32122301
- alins 4y agoManual for this unit is at https://cdn.shopify.com/s/files/1/0019/5952/files/Manual-RAD-0301.pdf?v=1653610356 https://cdn.shopify.com/s/files/1/0019/5952/files/Manual-RAD... I assume 'dual-beam' is the same as dual-channel? Does the calibration technique mentioned in the manual indicate dual channel operation?
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