following the "General Tips for Battery Operation", I tried to remove the power led in 2 of my pro mini 3.3V.
One by removing the led (using a small screwdriver as lever) and another by cutting the mark leading to it.
In both cases, this resulted in a board that didn't react anymore to my FTDI programmer.
Both boards where able to be uploaded a simple DHT mysensors sketch prior to the operation.
Evidently, they where not the boards linked from the mysensors pages, I had them from a previous project.
If anyone wonder, this is where I got them: http://www.aliexpress.com/item/Free-Shipping-new-version-5pcs-lot-QFN-Pro-Mini-328-Mini-ATMEGA328-ATMEGA328P-MU-3-3V/32264277091.html
They are obviously clones, and maybe this one doesn't support it, but I still am trying to find a way to get rid of this led.
This got me thinking that I have a few ATmega328P-PU in a drawer.
I'm pretty sure I did burn a bootloader on those, and they seem to be a perfect candidate to have 3.3V low power nodes in my network.
Although, I barely see any occurrences of this solution on the web site or in the forums.
Is there a reason for that, apart being maybe considered too advanced/complicated?
I remember having issue in the past with DHT22 and those on breadboard, giving unreliable results, but I think it was linked to non stabilized power getting below 3V.
I currently am wondering if I should continue with the pro mini boards, or switch to a simpler "boarduino" setup.
And if anyone had a similar issue with removing the led, and could revive the board, I' all hears too.