Arduino CO2 Sensor Controls PCM Fans in HRV

Daox · 04-03-13, 01:33 PM

Haha, that should do it (the box).

Shouldn't be too hard to find a 3.3v linear regulator, nor expensive. I'm sure that thing doesn't require much of anything for current.

As for the wacky readings, I believe its a best practice to average out your sensor readings. I did not do this with my thermal differential controller. Instead, I added a capacitor in parallel with the sensor and this absorbs spikes, but honestly it doesn't do it very well. During the times when the temperature is close to the turn on/off, the fans will kick on and off more than I'd like. Anyway, to remedy this, you can put your sensor readings into an array, then take the average of that array and make your decisions based off of that average. This allows for any off the wall numbers to have a lesser impact. However, if that wacky reading is persistant it will still cause trouble. In any case, you should be able to programatically filter things so that it isn't an issue.

04-03-13, 01:33 PM	#24
Daox Administrator Join Date: Aug 2008 Location: Germantown, WI Posts: 5,525 Thanks: 1,162 Thanked 374 Times in 305 Posts	Haha, that should do it (the box). Shouldn't be too hard to find a 3.3v linear regulator, nor expensive. I'm sure that thing doesn't require much of anything for current. As for the wacky readings, I believe its a best practice to average out your sensor readings. I did not do this with my thermal differential controller. Instead, I added a capacitor in parallel with the sensor and this absorbs spikes, but honestly it doesn't do it very well. During the times when the temperature is close to the turn on/off, the fans will kick on and off more than I'd like. Anyway, to remedy this, you can put your sensor readings into an array, then take the average of that array and make your decisions based off of that average. This allows for any off the wall numbers to have a lesser impact. However, if that wacky reading is persistant it will still cause trouble. In any case, you should be able to programatically filter things so that it isn't an issue. __________________ Current project - To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. & To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Last edited by Daox; 04-03-13 at 01:43 PM..