Hello everyone!
Like a lot of people before, I am using a D1 mini pro with a DHT22 temperature/humidity sensor shield.
As long as I power the D1 mini via USB, everything works fine.
Now I am trying to fit the boards into a case, add a battery pack for outdoor use.
Unfortunately, when I connect the D1 Mini with battery voltage, it won't boot, (blue led blinking, Tasmota connecting to Wifi).
I have a 4xAA battery pack giving 6.3 V. I tried it with 3xAA which gives 4,7V, to no avail.
When I connect with battery plus to the 5V pin and the battery minus with the GND pin, I can even measure 3.3 V at the 3V3 Pin, so the voltage regulator seems to work.
Any ideas, why it is not working?
Welcome to the forum
Does your sketch have any code in it that waits for Serial to be active before moving on ?
there is no sketch present, I flashed the Tasmota firmware on it.
Good hint! I will have a look, if there is any restraint in Tasmota preventing 5V pin to be used.
no restraint in Tasmota found why it wouldn't use the 5Vin Pin ...
Maybe everyone at the Tasmota forum understands the implications of that statement.
Hello,
I didn't find a solution with the 5V Pin..
Now I have used a USB-cable to get the 5V into the D1Mini.
It was a bit tricky, because I had to rely on the cable having red as Vin(+) and black as GND,
but it worked.
Thanks for your comments!
this problem is a duplicate of
change the protection diode with a zero-ohm resistance (bridge).
check here : WEmos minipro run from 3.3V - #2 by jim-p
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