ESP12F Minimum Serial Wiring

All ESP8266 boards running MicroPython.
Official boards are the Adafruit Huzzah and Feather boards.
Target audience: MicroPython users with an ESP8266 board.
PsuFan
Posts: 19
Joined: Mon Sep 30, 2019 7:35 pm

Re: ESP12F Minimum Serial Wiring

Post by PsuFan » Sat Oct 19, 2019 3:32 am

Finally got it booted, wasn't giving it enough power Scotty. Even the AA batteries that were powering a D1 mini aren't powering this thing. Still haven't found the boot baud...

PsuFan
Posts: 19
Joined: Mon Sep 30, 2019 7:35 pm

Re: ESP12F Minimum Serial Wiring

Post by PsuFan » Sat Oct 19, 2019 2:23 pm

I have confirmed that even the first schematic I posted is perfectly stable with a good power supply. I still haven't been able to boot with the serial adapter power or 2x Energizer Ultimate Lithium batteries that run at 3.4v. Still seeing a huge voltage drop on the batteries. Not seeing a ton of amperage, but not sure its reading right. Seeing 200mA draw max.

Edit: Seeing overheating with first schematic, recommend this minimum wiring:

v3.3:
-VCC
-EN (w/ 10k resistor)

GND:
-GND
-IO15 (w/ 10k resistor)

dennis1213
Posts: 3
Joined: Thu Jul 22, 2021 5:20 am

Re: ESP12F Minimum Serial Wiring

Post by dennis1213 » Mon Jul 26, 2021 4:05 pm

I have the similar problem as you did in the first place.
Successfully flash the FW, but couldn't get into the RPEL.

I tried the minimum wiring as you recommended with the breadboard power supply, but still no luck.

Could you please share your HW setup to make it work?

Thanks~
PsuFan wrote:
Sat Oct 19, 2019 2:23 pm
I have confirmed that even the first schematic I posted is perfectly stable with a good power supply. I still haven't been able to boot with the serial adapter power or 2x Energizer Ultimate Lithium batteries that run at 3.4v. Still seeing a huge voltage drop on the batteries. Not seeing a ton of amperage, but not sure its reading right. Seeing 200mA draw max.

Edit: Seeing overheating with first schematic, recommend this minimum wiring:

v3.3:
-VCC
-EN (w/ 10k resistor)

GND:
-GND
-IO15 (w/ 10k resistor)

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