ESP8266 Community Forum

- Fri Jul 07, 2017 6:24 pm #68051

• Always and only supply a stable 3.3V (at least around 500mA) to the ESP (and any of its pins)
• If you need to connect pins to 5V logic, use a level-shifter
• Never pull an ESP-port up to 5V, only pull up to 3.3V
• Did I already say that the ESP only accepts a stable 3.3V power supply of at least 500mA?

Right, so when using a voltage regulator on the mounting board the issue is I don't have a 3.3v rail to connect to. I guess that's an issue with using this type of regulator that is mounted. I guess my question was about how people who use the mounted regulator solve this problem.

- Fri Jul 07, 2017 8:44 pm #68054

Right, so when using a voltage regulator on the mounting board the issue is I don't have a 3.3v rail to connect to. I guess that's an issue with using this type of regulator that is mounted. I guess my question was about how people who use the mounted regulator solve this problem.

This is what I have done when I used those cheap mounting boards. Sorry about the poor picture quality. My macro lens is at work so this was a crop of a small portion of the original images.

I bend a longer pin so that it ends up on a 0.1" grid from the other pins. The next row/column. Sometimes I connect to the top of the soldered in pin as well. The pad is after the regulator, the VCC connection. (3.3v)

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- Sat Jul 08, 2017 5:08 am #68064 Yes, if you use the on board regulator then the breadboard obviously supplies +5V. The on board regulator supplies the +3.3V to the Vd pin of the esp-12 but there is no direct external connection to the +3.3V.

The easiest way round this is to solder a wire from the on board 3.3V to a flying lead to go back to the breadboard.

Personally I gave up on the adapter plate as too inconvenient and it is not particularly breadboard friendly in covering up a lot of holes . I now use a home made pogo pin adapter which allows me to develop and swap around esp-12 modules for programming without any soldering https://www.thingiverse.com/thing:2147460. For the 3.3V supply during development I use a serial board but bypass the internal 3.3V regulator (which can't supply enough power) by cutting the track to the 3.3V output pin and putting on a 3.3V regulator to feed it instead. Plugging the serial board into a breadboard then gives +5V, +3.3V and the RX, TX pins.