Difference between revisions of "IoT - ESP-Everything!"
| Line 33: | Line 33: | ||
==== Basic Design requirements ==== | ==== Basic Design requirements ==== | ||
| + | ==== The Resulting Set of Boards ==== | ||
| + | *[[IoT - ESP-M3 Everything!|ESP-M3 Everything!]] | ||
*ESP-01 Everything! | *ESP-01 Everything! | ||
| − | |||
*ESP-07 Everything! | *ESP-07 Everything! | ||
*ESP-SoC Everything! | *ESP-SoC Everything! | ||
Revision as of 19:47, 13 October 2020
My personal response to the weirdness that is ESP module form factors.
My introduction to ESP was the ESP-07.
It's an awesome module to play with. But it has a few issues.
Contents
The Issues
Issue #1: ESP devices run on 3.3V, not the ubiquitous 5V you can easily get by grabbing the nearest spare phone charger. This one's pretty simple. Put a 3.3V regulator in there. (I tend to grab the AMS1117-3.3. Cheap & easy...)
Issue #2: Every standard ESP module has a weird pinout at a weird pin pitch. Dunno why. They just do. Even the ESP-01 has a pain-in-the-ass pin layout. (but, at least it's on 0.1" spacing. Too bad it's designed to avoid breadboard compatibility...)
Issue #3: The most annoying one... To program an ESP chip, you have to hold gpio0 low during bootup or reset. Then you have to reset the board again to get out of programming mode. I get why they did it this way, but it's annoying.
Some available solutions
There are a number of cheap modules available that are basically either carriers for ESP modules or extensions of the ESP modules..
The LOLIN D1 mini is a favourite... It's "breadboard friendly" (as long as you don't mind it using up most of the width.) It has on-board regulation to run off 5V. It also has an onboard USB to Serial chip AND solves the gpio0 issue.
Sadly, most of these are in form factors that are not conducive to embedding in a finished project.
Also... I have an aversion to permanently installing a UART chip in devices that, once finished, will likely never need them again. When I'm working on a microcontroller project, I have a selection of UART modules handy to simply connect for programming. Afterwards, it's a redundant item.
So...
What I've done to try & solve a few of these issues
After discovering the ESP-M3, I determined that it would be nearly ideal for embedding into projects.
So I set out to design a carrier board for it.
& the whole bloody project got a little out of hand.
Basic Design requirements
The Resulting Set of Boards
- ESP-M3 Everything!
- ESP-01 Everything!
- ESP-07 Everything!
- ESP-SoC Everything!
