ESP-01: No D0 available, D4 (GPIO2) not working? about sonoff-tasmota HOT 7 CLOSED

I believe I have figured out the root cause. GPIO16 has a pull down resistor, which GPIO2 does not. So it seems that it's required to hard-wire GPIO16 to the reset pin directly on the board, unless we find some other way with an external circuit.

from sonoff-tasmota.

As I don't want to solder stuff to my ESP-01 module: I assume that the default state of GPIO16 is floating to allow the module to pull RESET high.

Once wakeup is triggered, the device should trigger the RESET by pulling GPIO16 low, which triggers the reset and GPIO16 is in floating again. Is that assumption correct so far?

from sonoff-tasmota.

The deepsleep on the esp8266 is hardwired to send the wakeup signal on D0 GPIO16. You cannot trick around this. Why do you have no access to it ? Just connect an additional wire with a small 10k resistor to it. But I thin RST and GPIO16 can also directly wired without a resistor

from sonoff-tasmota.

In my Firmware you can define a deepsleep GPIO, but this is just for enable/disable with a switch that the device go into deepsleep. It has nothing to do with the wake up.

from sonoff-tasmota.

Why do you have no access to it ?

The ESP-01 modules do not break out GPIO16. If this was an one-off project I'd solder the wires, but I plan on deploying 10 ESP-01 modules (which I actually have in stock, so I don't intend to buy other ones) so modding each of those is quite some task.

I think this issue can be closed, but I'd appreciate a link from the repo's README to this issue to help others having a similar issue.

I think I'll play around with it, maybe an external 555 software triggered reset circuit would work. Just prior the regular deepsleep, the firmware could send a signal on one of the regular GPIOs to start the timer, which then triggers the reset. It's a workaround, but I feel it's better than to solder wires to 10 ESP-01 modules ;)

from sonoff-tasmota.

http://www.instructables.com/id/Enable-DeepSleep-on-an-ESP8266-01/

from sonoff-tasmota.

I added an article on hackaday to the initial comment with a tl;dr regarding deep sleep on ESP-01 modules.

from sonoff-tasmota.