- Sat Jan 31, 2015 5:26 am
#8584
jankop wrote:It is unacceptable to connect universal inputs/outputs directly to the power supply or ground.
Connect GPIO0, GPIO2, RESET (CH_PD may be also) to Vcc through separate resistors around 5k6. Buttons to the ground on GPIO should have a series resistor around 330 ohm. If that fails, then you're doing wrong otherwise or can be yours circuits already damaged.
Suxsem wrote:So...can you please point me to where you found this information?
My experience with microcontrollers.
Thanks for your reply.
Today I tried with some resistors... the max resistor I can put on GPIO0 without get a lot of failed boot is 220omh. I tried with 476omh (NOT KOMH!) and i got a lot of failed boots.
I tried 3 boards...I don't think that they are all damaged...
What do you think about internal pullup of GPIO0?
EDIT:
maybe a found the problem! The pullup resistor on RESET pin must be greater than the pullup resistor on CH_PD and GPIO0! Now i'm testing this setup:
RESET: 65Komh
CH_PD: 10Komh
GPIO0: 10Komh
and i didn't got a failure yet...i will update you soon!