(Verified) Super easy-to-use ESP32 programmer

##1.2V part of the layout has been modified

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I have purchased (prostituted) a lot of ESP32-S modules recently, but I found out that the pins on the ESP8266 module are really not enough for some projects. So with the experience of the ESP8266 programmer mentioned earlier, I drew another ESP32 programmer programmer. But what is certain is that the price of the burner on a certain treasure is really expensive. (Because I am a student, can you give it to me for free?)

This engineering design supports two models: ESP32-S ESP32-WROOM

The pins of these two models are the same, directly PIN TO PIN.

Although there are other ESP32 models, my ability is limited and I cannot draw a universal board.

This project supports automatic programming, and the pin header is drawn out to facilitate external testing.

Design:

1. Adopt the popular Type-C interface (keep up with the times)

2. Use AMS1117-3.3 LOD voltage drop chip (I have stocked a lot and need to use it up)

3. Use CH340K serial port chip (reduce size and cost. CP2102 is really expensive)

4. Use DDC114TU-7-F to replace the previous two 0805 transistors + 10K resistors to achieve automatic downloading (to reduce the size)

5. The lead-out pins are in double rows, which reduces the size and facilitates debugging (unfortunately, there are too many pins, double rows yyds)

In terms of cost, the price is less than 10 yuan each.

(All devices are easy to purchase. Do not use the BOM of this project when placing an order, because some are reused but have different sizes)

Key points to note:

This project uses DDC114TU-7-F, which is small in size and meets the needs of automatic downloading.

Both built-in resistors are 10K, and there are two built-in NPN transistors.

Commonly used automatic download circuits

Using this design during design can satisfy automatic downloading. If you want to reduce the size of the design, you can use this device.

The official price of Lichuang is 3 cents each, which is not too expensive for personal use. If you want to further reduce costs, you can use the original solution.

Burn test:

Tools esphome

Board beautification:

You can see the power wiring at a glance, which is very convenient.

Double-row pin header, the pins from the inside out are also easy to view.

Test needle tips:

First, break the test needle a little larger.

Place the chip, first secure all the test pins, and then use pliers to remove the soldered section

Then use tweezers to tilt it outward (leverage principle), using the thickness of the module, and that's it.

Project pictures:

The output voltage:

              3.3V

           5.1V

If you have any questions, please ask in the comment area at the bottom.