I'm trying to power a node mcu board using the Vin pin. I've connected it to an old charger that produces 8V. I've verified that the charger is indeed producing 8V, but when I connect it to the board, the voltage between Vin and Gnd is only 0.5V. The board works fine when I connect the USB to my laptop. What am I missing here?
Maybe it's a cr*p supply.
"Load check" it - place some real-world resistance on it, pull some current, note the effect on the output.
Even if you could get it working, don't.
With 8volt on Vin instead of the 5volt it's designed for, the 3.3volt regulator has to work twice as hard.
Expect problems.
Just use a 5volt cellphone charger, connected to the USB socket of the NodeMCU.
Leo..
Wawa:
Even if you could get it working, don't.
With 8volt on Vin instead of the 5volt it's designed for, the 3.3volt regulator has to work twice as hard.
Expect problems.Just use a 5volt cellphone charger, connected to the USB socket of the NodeMCU.
Leo..
Specifications I checked online said 6-12V is the operating voltage. Is that wrong?
runaway_pancake:
Maybe it's a cr*p supply.
"Load check" it - place some real-world resistance on it, pull some current, note the effect on the output.
There's an ultrasonic sensor in the circuit that measures about 20k ohms.
I tried with different sources, 5V, 6V, still giving the same 0.5V at Vin.
adarshsalagame:
Specifications I checked online said 6-12V is the operating voltage. Is that wrong?
Anything more than 5volt on Vin is only going to heat up the board.
Until the point that things get too hot, and fail.
The 3.3volt regulator is normally supplied with ~4.5volt when on USB power.
0.5volt on Vin could mean a short circuit somewhere.
Did you solder the headers on yourself?
Post a clear picture of the setup.
Leo..