ESP8266 Community Forum

- Fri Apr 13, 2018 6:03 am #75342 I got the breakout board and can solder same .Wanted to know what's the pin in the circle mentioned in the
image in the breakout board

- Fri Apr 13, 2018 6:42 am #75343 Whenever a question similar to this gets asked, and I don't know, then I suggest you contact the seller as they should know what they sold you and also provide you support.

- Fri Apr 13, 2018 7:51 am #75345 Hi, there are 2x 10K resistors (left and right) marked 103:
The left one is a pull up on CHPD.
The right one is a pull down on GPIO15.

There is a 0R or short (center) marked 0:
This links out the voltage regulator when not fitted and needs to be removed if you fit a regulator.

Nothing else inside the 'circle' has any connection to the ESP.

- Fri Apr 13, 2018 9:48 am #75347 Also in my opinion these break out boards are not that useful (chocolate teapot).

If the intention is to use them with plug in breadboards then they will normally cover up all the connecting holes. So you end up using wires to connect the break out board to the breadboard. Messy and increasing wire lengths is never a good idea. One can work around that by sawing the breadboard in half so that they can be spaced out.

However, then you have the issue that the esp-12 module is committed to the soldered in break out. If you leave that one for development then you still have the issue of how to connect to program modules that you are going to deploy.

Using a dev board with built in usb / power supply is easy for development and can be used for final solution in some cases. If wanting to deploy esp-12 modules (smaller / cheaper) then you want some form of temporary connection jig. There are various schemes around for this. I now use a pogo pin based method which works for both development and programming, e.g. https://www.thingiverse.com/thing:2844982