Power supply confusion...


 
J

Jon_Skeet

New member
Hi All,

Just getting ready to bring 2 HM's to life and am a bit confused PSU wise.

I have the 5v microUSB PSU for the Pi and have just ordered a 12v 5A psu for the blower.

Do you actually need both as I can't find a definitive answer?

Cheers,

Jon.
 
Jon:
No just need the 12V supply for running the HM. 5v supply is recommended for initial start up in case you have a short so you will not fry you Pi.
12V to run once you have it checked. Never plug in both power supply's in at the same time.
Sam
 
I use the HM just for temps so the usb is perfect, i can run it from a usb battery. If i was using the fan/servo i would need a 12v supply.
 
This from Brian's HeaterMeter 4.x Software Installation page; "....Insert the SD card into the Raspberry Pi and power it up using either the 12V barrel jack on the HeaterMeter board or the rPi micro USB power input. Do not hook up both at the same time! For the first boot, using the rPi USB power input is preferred to verify the operation of your assembled HeaterMeter board without the chance of subjecting the rPi to 12V which will definitely fry components on it. I know from experience."

See https://github.com/CapnBry/HeaterMeter/wiki/HeaterMeter-4.x-Software
 
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