ESP32 Notes
please see these pages
Example Projects
External Links
- Official MicroPython Page
Product Comparison
- https://johnmu.com/picking-esp32-dev-board/
- https://makeradvisor.com/esp32-development-boards-review-comparison/
- https://www.mouser.com/ProductDetail/Espressif-Systems/ESP32-DevKitC-32D?qs=%252BEew9%252B0nqrDsObWEpDx6YQ%3D%3D&mgh=1&gclid=CjwKCAjwybyJBhBwEiwAvz4G74ePru_-tQfWS_DEqBxOR0LHcscr8IffqZhiS-5BOsP_XoH8helCLRoCF3wQAvD_BwE
- https://www.mouser.com/ProductDetail/Espressif-Systems/ESP32-C3-DevKitC-02?qs=stqOd1AaK7%2F1Q62ysr4CMA%3D%3D
- mouser search
- digikey search
micropython general refs
Install micropython IDE
derived from here
- Windows Instructions
- Mac Instructions
- Linux Instructions
- Using VSCode
- Installing Thonny(randomnerd)
-
Installing Thonny(microcontrollerslab)
-
Installing
bash sudo pip3 install thonny pip install thonny # use this if anaconda is installed -
Running
bash thonny
-
Flash $\mu$python
You will need the esptool from espressif (github)
It can be installed via pip from command line:
pip install esptool
First erase the flash
esptool.py --chip esp32 --port /dev/ttyUSB0 erase_flash
From then on program the firmware starting at address 0x1000:
esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x1000 esp32-20190125-v1.10.bin
- https://micropython.org/download/esp32/
- https://randomnerdtutorials.com/flashing-micropython-firmware-esptool-py-esp32-esp8266/
- https://randomnerdtutorials.com/flash-upload-micropython-firmware-esp32-esp8266/
- https://micropython-docs-esp32.readthedocs.io/en/esp32_doc/esp32/tutorial/intro.html
Pinout
TL/DR:
- RX0 / TX0 are used by the onboard silabs USB/serial chip
Pinout Resources:
- https://johnmu.com/picking-esp32-dev-board/
- https://www.etechnophiles.com/esp32-dev-board-pinout-specifications-datasheet-and-schematic/
- https://www.studiopieters.nl/esp32-pinout/
Examples
MQTT
Serial
- https://docs.micropython.org/en/latest/library/machine.UART.html
- https://techoverflow.net/2020/02/22/micropython-esp32-minimal-uart-example/
Analog
-
https://randomnerdtutorials.com/esp32-esp8266-analog-readings-micropython/
```python from machine import Pin, ADC from time import sleep
pot = ADC(Pin(34)) pot.atten(ADC.ATTN_11DB) #Full range: 3.3v
while True: pot_value = pot.read() print(pot_value) sleep(0.1) ```
Other Micropython stuff
-
Importing packages...use
upip -
- Logging in python3 (not all features work): https://docs.python.org/3/howto/logging.html
- Python standard libraries available for micropython
- micropython specific libraries
- ESP32 Specific Libraries
- Information on ping
FAQ (from amazon)
1
vote
Question:
What board should be selected from the arduino esp32 support?
Answer:
Please use the NodeMCU-32S profile
By Xiuxin Seller on September 17, 2018
1
vote
Question:
What is the size of the Flash memory on the module?
Answer:
4MB
By Xiuxin Seller on March 11, 2019
0
votes
Question:
What is the processor clock speed (Mhz) ?
Answer:
The processor clock speed is 240 MHz, as indicated by esptool.py during "make flash:"
Chip is ESP32D0WDQ6 (revision 1) … see more
By Music Maker on April 1, 2019
2500 Mhz
By Xiuxin Seller on January 7, 2019
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0
votes
Question:
Where can I find a schematic, or any documentation at all? It came with zilch.
Answer:
https://github.com/Nicholas3388/LuaNode
By Christian U. on May 2, 2019
https://spacehuhn.com
By GEORGE ALLEN on May 1, 2019
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0
votes
Question:
What board should I choose? I followed espressif git configurations
Answer:
problem with this one is it's too wide to fit on a standard breadboard.. you'll need to be creative. https://www.youtube.com/watch?v=RtUIegaN644
By I'm Rich James on August 2, 2018
0
votes
Question:
why is there a capacitor soldered from the "en" button to some weird point on the board. this does not show up in the description
Answer:
It allows the board to automatically enter boot mode to receive code uploads. Otherwise, you have to hold the boot button during code upload.
By Spaceboyr00 on March 9, 2020
Sorry I don’t know the answer.
By Americubariqueño on November 18, 2019
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0
votes
Question:
Does this board can read in analog values?
Answer:
Yes, there are 15 analog inputs and the analog voltages 0v to 3.3v map to digital values of 0 to 4095 respectively.
By Larry J. on January 29, 2019
THere are 2 ADC's Each with about 7 AI's. However, ADC 2 is not available when WiFi is active. So, yes its there, but not really
By jt on July 22, 2019
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0
votes
Question:
Where can I find a pinout? Which pins are analog?
Answer:
Google search with name of the board
By Dawid W. on August 18, 2021
0
votes
Question:
can this charge a lipo battery?
Answer:
You need additional module to charge a battery
By Dawid W. on August 18, 2021
0
votes
Question:
What is the spacing on the mounting holes?
Answer:
approx. 47mm x 23.5mm (I never use the mounting holes, 30 soldered pins is more than enough)
By Steve Weingart on August 18, 2021
They fit a standard breadboard. So 1/10" or 2.54mm
By Jerry Stephens on August 18, 2021
46 x 18mm and 46 x 19mm on the other side as close as I can measure
By Jim V on August 18, 2021
The board is about quarter size in width
By Dawid W. on August 18, 2021
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