Small air-quality logger using a NRF24 to send data to a central unit.
Well it has been a while but after trying different controllers to get the information from the MySensors network i decided to write my own controller (that in the future also will suport ZigBee). So this was quite a massive undertaking but i am at the point where data gets stored in a database that have been send by the sensor-node.
The controller needs a lot more work to be done, and a nice web-interface must be added for easy insight in the data.
I updated the hardware with a little transistor to switch the CO2 sensor on or off, so there is still progress but this project is changing from a simple air-quality logger to a full controller for mesh-networks.
After a couple of hours i finished some of the initial tasks, however there is still some work to do which i postponed because of the lack of components. I still need some transistors and a 10uF capacitor, however i could run some tests already :) !
I decided to build an extra board acting as gateway with the Raspberry Pi, this way i can run the mesh-network without the raspberry being on, this extra board will serve as the master-node and a serial-gateway to the Pi. Because of the missing 10uF capacitor on this board i get a lot of transmission errors, but this will soon be over.
(Dont mind the stuff in the right upper corner its from an old project)
The sensor-board is missing a transistor to turn off the CO2-sensor, this sensor needs to be heated before it can be used but this process draws a lot of current from the battery's, so the controller must be able to turn the heating process off with the use of a transistor.
(Sawing didnt go so well :(, need to fix that)
The test were positive and i could see connectivity between the two nodes, the master node has a lot of transmission errors though.
to be continued !