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Time to build out how the arduino controls a relay. I got a 5v relay from Radio Shack to play with.


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arduino_relay.png [ 48.88 KiB | Viewed 7173 times ]


It's a but more complicated than I thought. Then I realized I'd need to supply power to the relay AND the sensor from the arduino. Good thing the arduino has a 5v and 3.3V...

So I got this bad boy. All of the circuitry and diode is in the box


So to test things out...


The wiring is a lot less complicate than before.

I then put the whole thing in a power box. For easy connection, I used a telephone 6 pin connector to connect to the arduino.


Hook everything up to a power outlet.


And then test everything out on a desk lamp.

Here's the sensor with the new silicone membrane.

I know this topic is very old, and there were no updates for very long, but I want to ask you if you were willing to make me this DIY CO2 meter for money (and how much would it cost)? I would like to try it in my aquatic experiments, but I'm not as technically skillful to be able to do it myself. I have one non-commercial website about nature aquariums (), and would like to share the results with others to get our hobby on a higher level of understanding.

If you can help me, I'll be glad.

Marcel G

Ok, This project is back. I was browsing PVC tubings at the hardware store and saw some components that might work as an enclosure. I'll still use the silicone membrane because it's way cheaper. I will also add a fan and humidity sensor in with CO2 sensor. The fan will speed gas exchange. Water molecule will pass through the membrane like CO2. That's where the humidity sensor comes in and it'll help out in telling you if there's a leak.

If the humidity is too high, say 90%, I'd just open the enclosure to let the moisture out. So I'll have to design the enclosure where it's easy to open and close.