choosing the right GPIO

[giorgino]

Hi, my project is growing up, connecting more I/O but I'm not sure if I've got the right pins
Can you look if I'm wrong?
I have 8 GPIO:

• 1 - Victron VE (Battery monitor) -- HWserial 0 --- GPIO 38
  2 - Vicron VE (Solar charger) -- HWserial 1 --- GPIO 13
  3 - pulse counter --- GPIO 15
  4 - DHT 22 --- GPIO 17
  5 - TX by GPS -- HWserial 2 --- GPIO 19
  6 - TX by NEXTION display -- HWserial from I2C --- GPIO 10 by I2C
  7 - RX by NEXTION display -- HWserial from I2C --- GPIO 11 by I2C
  8 - module relais -- GPIO 40

4 (with 4k7 pulldown)

[TD-er]

The S3 doesn't have a lot of limitations.
However there is a number of GPIO pins you may want to leave alone.
See: https://espeasy.readthedocs.io/en/lates ... n-esp32-s3

[Ath]

We have some documentation on what pins (better) not to use in certain situations: https://espeasy.readthedocs.io/en/lates ... /GPIO.html
That could guide you in the right direction

[giorgino]

aaaah, I hadn't seen it before
thanks alot - as always

[giorgino]

using the ESP32-s3 in the above pinout I guess if i could power it by two pin instead of USB connecor.
I try to connect 0 to gnd and 5v to "5v in" but the unit doesn't boot. It appen only if I press the RST button on the unit
How can I power (and boot) it without USB ?

[TD-er]

The 5V is not always on all boards an input.
Also on some boards having the ESPEasy console writing to the USB port may cause issues when no computer is connected.

You can try to disable sending the ESPEasy console to HW CDC on the tools->Advanced page.
Then try to boot the ESP only powered via 5V.
Maybe also try to measure the resistance between each GND pin to see if those are actually connected.

[giorgino]

nothing: I connect different gnd too:
When powering I geto only red led lights on
then i press RST ( or BOOT) and green led lights on and espeasy goes online

Since i don't press the unit stay idle with red led waiting

[TD-er]

Hmm sounds like GPIO-0 is pulled to GND a bit too long.
Maybe you can add some capacitor between RST and GND to keep it a bit longer in RST to let the power supply stabilize first.

No idea what value. Could be 1uF is enough, but maybe you need a bit more.
And maybe a 10k resistor between 3V3 and GPIO-0 to pull it up slightly faster.

[giorgino]

in effect sometimes when I connect 5v the green led lights on too, but sometimes no

[giorgino]

connected a capacitor 4.7uF (the lowest available in my lab) and seems work (first boot not, the other in short sequence everyone boots ok)
About the resistor between GPIO 0 and GND: I don't have any GPIO-0, I start from 1

[Ath]

About the resistor between GPIO 0 and GND: I don't have any GPIO-0, I start from 1

Your schematics show GPIO0 between GPIO35 and GPIO45... (close to the BOOT button on the board-image)

[giorgino]

ops, sorry

Anyway, with 10k between gpio0 and gnd it's worst: never boot! pushing button the green blinks but remain off

Reset Pin
GPIO ← Switch:
- None -

is this ok?

[Ath]

The pull-up resistor should be from 3.3V to GPIO-0, not from GND, as keeping GPIO-0 to GND will boot it into flash-mode, instead of run mode.

[giorgino]

IT WORKS !
thanks


better (for me) going bed early tonight