Does anyone know of a buzzer/alarm that can be connected to a photon to provide a very loud noise to sound when a thermcouple sensor reads a certain value?
You could use a piezo buzzer. Alternatively, use a siren and enable that using a relay/mosfet.
Do you have any examples of sirens I could use? Or ways to hook them up?
That’d depend on how loud you’d want it to be. If you browse around the forums and/or Hackster for a bit, you ought to find plenty examples.
I used this for a project once. https://www.sparkfun.com/products/7950
Wasn’t super earsplitting, but was loud enough.
Note that the 35mA spec exceeds the 25mA limit on the GPIO pins. I connected it directly anyway, and it worked and didn’t burn up that pin on my Photon. I did it because:
- I didn’t send a continuous tone, but beeped it on and off
- 3.3V is slightly less than the 3.5V rated voltage, so I figured it would consume a bit less than 35mA
- The 35mA is a max rating, and it probably consumes a little less
Anyway, don’t blame me if you burn up that pin on your Photon.