CO2MeterHacking

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Revision as of 18:36, 18 March 2014 by Bertrik Sikken (Talk | contribs)

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Project CO2MeterHacking
Status Initializing
Contact bertrik
Last Update 2014-03-18

Introduction

This project is about hacking the Voltcraft CO-100 CO2-sensor, such that we can read the exact ppm value as displayed on the LCD.

This particular CO2-sensor is present in the klusbunker at RevSpace and is currently used to control the ventilation in a crude manner (by monitoring the warning LEDs on the display module). Having the CO2 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.

The user manual of the Voltcraft CO-100 says "Attention! The RJ45 connection (see chapter 7, item „K“) must not be used. The connection is only intended for the manufacturer". Of course, a claim like that can only be interpreted as a challenge! :)

Investigation

CO-100 internals

The CO2 sensor inside the CO-100 (in the left of the picture) has a sticker saying ZGw063RY. Googling for this number reveals a CO2 module that looks just like the Voltcraft CO-100, so it appears that the CO-100 is basically just a rebranded ZyAura ZGw063RY module.

The CO-100 seems to miss a bunch of components that can be mounted on the PCB, close to the RJ45 connection (possibly an RS232 chip with step-up capacitors).

components around the RJ45 connector

CO2 sensor

The CO2 sensor in the CO-100 looks very much like the ZyAura ZG-01 module. According to the description, this uses a proprietary ZyAura digital protocol.

Other sensors on the market: