Temperature Logger and Buzzer

[kim27]

After fighting the on-board temperature sensor, I can't seem to make heads or tails of my data; so I decided to use an external sensor, the DS18B20.



I then hooked up my relay, a G5V-1-DC3. But the relay kept locking up. I was trying to using a CFL, but the inrush current was very high, and it exceeded the rating of my relay. I've also read that Halogen lights may cause similar problems, but I haven't tested these out. I was able to dig around and find an incandescent light bulb.

I made a few changes to the code, and I have my first home built incubator.

 

[kim27]

Hatching!

 

[jeremyd1981]

Couple of suggestion. Trying to drive a higher voltage buzzer with logic level (3.3v) is going to effect readings across your sensors as is lowers the voltage across the circuit. I would suggest using a buzzer that is supplies by another power source and using a transistor or relay controlled with logic level voltages to switch your buzzer. Would not take any changing to your coding at all. Just use the wire that your were turning your buzzer on and off with and run it the the control pin of a solid state relay.