Ignignokt
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So - the meter will set you back maybe $250.00. I like the dew point output - but I could calculate that myself. I think this is the easy approach to integrating a CO2 meter with a Raspi to create a controller that can be monitored and manipulated over a network. That is one aspect where most other controllers will cost you dearly to get network access. And even then - they do not let you customize (I really hate that).
I digress.
So - first cost cutting option is to obtain the CO2 sensor itself. The AMPRO meter uses a sensor that is available from sources in China - Winsen. I've seen them for a variety of prices, however the best deal I've found so far is:
http://sandboxelectronics.com/?prod...art-5v3-3v-interface-for-arduinoraspeberry-pi
As it turns out - this sensor has a serial output and has a similar data stream. I've found the Raspi to be otherwise problematic for direct integration - so I've used small arduino controllers that then connect to the Raspi over a USB port. Part of the reason for this is to disable the built in recalibration. That can only be done over the I2C interface.
So with a Raspi (~$35.00) and the sensor (~$70.00) you can have a network accessible CO2 controller and monitor for a bit over $100.00.
My current incarnation of the design uses only a SAMD Arduino (like the zero) with a wireless network connection to a Pi running MQ server. The idea was to move to a IOT compatible framework like MQTT.
I digress.
So - first cost cutting option is to obtain the CO2 sensor itself. The AMPRO meter uses a sensor that is available from sources in China - Winsen. I've seen them for a variety of prices, however the best deal I've found so far is:
http://sandboxelectronics.com/?prod...art-5v3-3v-interface-for-arduinoraspeberry-pi
As it turns out - this sensor has a serial output and has a similar data stream. I've found the Raspi to be otherwise problematic for direct integration - so I've used small arduino controllers that then connect to the Raspi over a USB port. Part of the reason for this is to disable the built in recalibration. That can only be done over the I2C interface.
So with a Raspi (~$35.00) and the sensor (~$70.00) you can have a network accessible CO2 controller and monitor for a bit over $100.00.
My current incarnation of the design uses only a SAMD Arduino (like the zero) with a wireless network connection to a Pi running MQ server. The idea was to move to a IOT compatible framework like MQTT.