CO2MeterHacking - Revision history

Luteijn: /* Investigation & findings */ add link to another pdf describing info on a serial protocol

2018-02-19T12:33:30Z

Investigation & findings: add link to another pdf describing info on a serial protocol

← Older revision		Revision as of 12:33, 19 February 2018
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	The CO-100 seems to miss a bunch of components that can be mounted on the PCB, close to the RJ45 connection (most likely an RS232 chip with charge pump capacitors).		The CO-100 seems to miss a bunch of components that can be mounted on the PCB, close to the RJ45 connection (most likely an RS232 chip with charge pump capacitors).
	[[File:Co-100.jpg\|thumb\|left\|components around the RJ45 connector]]		[[File:Co-100.jpg\|thumb\|left\|components around the RJ45 connector]]

			http://co2meters.com/Documentation/AppNotes/AN146-RAD-0401-serial-communication.pdf has some information on what looks like a clone/similar device, describing a serial cable for the RJ45, and the protocol used, as well as some info on re-calibration. Commands/Identifiers seem to match.

	The CO<sub>2</sub> sensor in the CO-100 is a [http://www.zyaura.com/products/ZG_module.asp ZyAura ZG-01 module].		The CO<sub>2</sub> sensor in the CO-100 is a [http://www.zyaura.com/products/ZG_module.asp ZyAura ZG-01 module].

2017-11-06T07:50:47Z

ZG-01 decoding

← Older revision		Revision as of 07:50, 6 November 2017
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	On each falling edge of the clock line, a sample of the data line is taken until a total of 40 bits is received.		On each falling edge of the clock line, a sample of the data line is taken until a total of 40 bits is received.
	If the time between a bit and the previous bit is longer than 2 milliseconds, it is assumed that a new 5-byte frame has started.		If the time between a bit and the previous bit is longer than 2 milliseconds, it is assumed that a new 5-byte frame has started.

			The technical description for a very similar CO2 module: [http://www.zyaura.com/support/demo/ZG106_FW_001.ExtSpec.pdf ZG106 protocol].

	=== Wireless protocol ===		=== Wireless protocol ===

2017-05-21T16:18:27Z

Add mosquitto command

← Older revision		Revision as of 16:18, 21 May 2017
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	* revspace/sensors/humidity with the relative humidity in percent, e.g. "43.56 %"		* revspace/sensors/humidity with the relative humidity in percent, e.g. "43.56 %"
	* revspace/sensors/temperature with the temperature in degrees Celcius, e.g. "23.9 °C"		* revspace/sensors/temperature with the temperature in degrees Celcius, e.g. "23.9 °C"

			For example, running
			mosquitto_sub -h revspace.nl -t revspace/sensors/co2 -v
			produces output like
			revspace/sensors/co2 530 PPM
			revspace/sensors/co2 530 PPM
			revspace/sensors/co2 532 PPM
			revspace/sensors/co2 533 PPM

	=== Graphs and heat maps ===		=== Graphs and heat maps ===

2017-05-19T20:55:05Z

Temperature

← Older revision		Revision as of 20:55, 19 May 2017
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	* revspace/sensors/co2 with the CO2 concentration in ppm, e.g. "400 PPM"		* revspace/sensors/co2 with the CO2 concentration in ppm, e.g. "400 PPM"
	* revspace/sensors/humidity with the relative humidity in percent, e.g. "43.56 %"		* revspace/sensors/humidity with the relative humidity in percent, e.g. "43.56 %"
			* revspace/sensors/temperature with the temperature in degrees Celcius, e.g. "23.9 °C"

	=== Graphs and heat maps ===		=== Graphs and heat maps ===

2017-05-09T07:56:23Z

Completed

2017-03-30T09:31:34Z

← Older revision		Revision as of 09:31, 30 March 2017
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	The ESP version of the software uses MQTT to publish the measurement values, on the following topics (retained):		The ESP version of the software uses MQTT to publish the measurement values, on the following topics (retained):
	* revspace/sensors/co2 with the CO2 concentration in ppm, e.g. "400 PPM"		* revspace/sensors/co2 with the CO2 concentration in ppm, e.g. "400 PPM"
	* revspace/sensors/humidity with the relative humidity in percent, e.g. "43 %"		* revspace/sensors/humidity with the relative humidity in percent, e.g. "43.56 %"

	=== Graphs and heat maps ===		=== Graphs and heat maps ===

2017-03-30T09:30:30Z

Update ESP version pin connection table

← Older revision		Revision as of 09:30, 30 March 2017
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	! Remark		! Remark
	\|-		\|-
	\| D1 \|\| ZG-C \|\| ZG01 clock signal		\| D1 \|\| ZG-C \|\| ZG01 clock signal, 3.3V
	\|-		\|-
	\| D2 \|\| ZG-D \|\| ZG01 data signal		\| D2 \|\| ZG-D \|\| ZG01 data signal, 3.3V
	\|-		\|-
	\| GND \|\| ZG-G \|\| ZG01 ground		\| GND \|\| ZG-G \|\| ZG01 ground
	\|-		\|-
	\| 5V \|\| ~~ZG-V~~ \|\| ~~ZG01 power~~		\| 5V \|\| ? \|\| Supply voltage from 8P8C, about 6V!
	\|}		\|}

2017-03-24T07:42:56Z

Use T568B pin numbering

← Older revision		Revision as of 07:42, 24 March 2017
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	Pin-out of the 8P8C ("RJ45") connector on the side of the CO-100:		Pin-out of the 8P8C ("RJ45") connector on the side of the CO-100:
	{\| class="wikitable"		{\| class="wikitable"
	! ~~Pin nr~~		! T568B
	! Colour		! Colour
	! Signal		! Signal
	\|-		\|-
	\| 1? \|\| ~~green~~-white \|\| ~~CLOCK~~, 3.~~3V level~~		\| 1 \|\| orange-white \|\| Supply voltage out, measured about 5.7V
	\|-		\|-
	\| 3? \|\| orange~~-white~~ \|\| ~~Supply voltage out~~, ~~measured about 5~~.7V		\| 2 \|\| orange \|\| DATA, 3.3V level
	\|-		\|-
	\| 4? \|\| ~~blue~~ \|\| ~~GND~~		\| 3 \|\| green-white \|\| CLOCK, 3.3V level
	\|-		\|-
	\| 6? \|\| ~~orange~~ \|\| ~~DATA, 3.3V level~~		\| 4 \|\| blue \|\| GND
	\|}		\|}

2017-03-20T12:06:05Z

Add links to the zg-01 user manual and another web page about the Voltcraft CO-100

← Older revision		Revision as of 12:06, 20 March 2017
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	This particular CO<sub>2</sub>-meter is present in the main space of RevSpace.		This particular CO<sub>2</sub>-meter is present in the main space of RevSpace.
	Having the CO<sub>2</sub> ppm value available as a number allows for nice things such as logging the levels over time, announce them on IRC, show them on the [[LedBanner]] , etc.		Having the CO<sub>2</sub> ppm value available as a number allows for nice things such as logging the levels over time, announce them on IRC, show them on the [[LedBanner]], fine-grained control of the ventilation system, etc.

	The user manual of the Voltcraft CO-100 says		The user manual of the Voltcraft CO-100 says
	"Achtung!		"Achtung! Der RJ45-Anschluss (siehe Kapitel 7, Position „K“) darf nicht verwendet werden. Der Anschluss ist nur für den Hersteller vorgesehen."
	Der RJ45-Anschluss (siehe Kapitel 7, Position „K“) darf nicht verwendet werden. Der Anschluss ist nur für den Hersteller vorgesehen."
	Of course, a claim like that can only be interpreted as a challenge! :)		Of course, a claim like that can only be interpreted as a challenge! :)

			See also:
			* http://www2.zyaura.com/support/manual/pdf/ZyAura_CO2_Monitor_Carbon_Dioxide_ZG01C%20Module%20English%20user%20manual_1404.pdf
			* http://www.palebluedot.nl/jml/projects/arduino/52-reading-data-from-the-voltcraft-co-100

	== Investigation & findings ==		== Investigation & findings ==

2017-03-20T11:54:52Z

Add guess of 8P8C pin numbers

← Older revision		Revision as of 11:54, 20 March 2017
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	! Signal		! Signal
	\|-		\|-
	\| ? \|\| ~~orange~~-white \|\| ~~Supply voltage out~~, ~~measured about 5~~.7V		\| 1? \|\| green-white \|\| CLOCK, 3.3V level
	\|-		\|-
	\| ? \|\| ~~blue~~ \|\| ~~GND~~		\| 3? \|\| orange-white \|\| Supply voltage out, measured about 5.7V
	\|-		\|-
	\| ? \|\| ~~orange~~ \|\| ~~DATA, 3.3V level~~		\| 4? \|\| blue \|\| GND
	\|-		\|-
	\| ? \|\| ~~green-white~~ \|\| ~~CLOCK~~, 3.3V level		\| 6? \|\| orange \|\| DATA, 3.3V level
	\|}		\|}