Esp32

overview

a good video that goes over the various releases of esp32:

DroneBot Workshop ESP32 Guide 2024 | Choosing and Using an ESP32 Board

https://www.youtube.com/watch?v=u5unB24lhC4

a tool for detecting you esp32 type

https://espressif.github.io/esptool-js/

esp32-c3-devkitC-02

I got some esp32-c3-devkitC-02

Reference: https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/hw-reference/esp32c3/user-guide-devkitc-02.html

from the hardware schematic i seethe RGB LED is SK68XXMINI-HS

I used adafruit neopixel library to drive this RGB LED. it's one wire or i2c or something. Pin 8

https://www.rose-lighting.com/wp-content/uploads/sites/53/2020/05/SK68XX-MINI-HS-REV.04-EN23535RGB-thick.pdf

talk to it via I2C

damn trying to get the boot flashed.

this is what I'm going on now:

https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html

board manager extras:

https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json

old config:

https://dl.espressif.com/dl/package_esp32_index.json,
http://arduino.esp8266.com/stable/package_esp8266com_index.json

This page has some particulars:

https://www.smart-prototyping.com/blog/How%20to%20Install-ESP32-Core-Arduino-IDE

c3 02

image:esp32-c3_devkitM-1_pinlayout.png

esp32 c3 devkitm-1 ( mini)

I'm having a lot of trouble with esp32-c3-mini-1

I can use arduino to flash stuff, but the script never starts.

Serial monitor show 0x7 and 0x10 on repeating cycle.

I think it needs series of pin setting on boot to work.

https://arduino.stackexchange.com/questions/86177/how-arduino-ide-work-with-esp32

/ESP32-C3 (revision v0.3) flash output example

to watch: troubleshooting esp32 c3 mini https://www.youtube.com/watch?v=pNJBaWZ_vj0

ESP32 C3 mini

forum search c3 mini:

https://esp32.com/search.php?keywords=mini&fid%5B0%5D=19

Can't program ESP32-MINI-1 over serial despite "Waiting for Download"

https://stackoverflow.com/questions/74819838/cant-program-esp32-mini-1-over-serial-despite-waiting-for-download

hits to follow up:

ESP32-S3-MINI-1 wouldn't start

https://esp32.com/viewtopic.php?f=19&t=35137&p=118359&hilit=mini#p118359

https://esp32.com/viewtopic.php?f=19&t=35137&p=118768&hilit=mini#p118768

ESP32-C3-MINI-1U reboot loop when switching GPIO7

https://esp32.com/viewtopic.php?t=27152

to try: https://docs.espressif.com/projects/esp-idf/en/v4.3/esp32c3/api-guides/bootloader.html esp-idf factory reset process

I could not get this to worrk: https://docs.espressif.com/projects/esp-at/en/latest/esp32c3/Get_Started/Hardware_connection.html

esptool.py under windows used :

C:\Users\user>C:\Users\north\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\Scripts\esptool.py.exe --chip esp32c3 --port COM10 flash_id
esptool.py v4.5.1
Serial port COM10
Connecting....
Chip is ESP32-C3 (revision v0.3)
Features: WiFi, BLE
Crystal is 40MHz
MAC: 58:cf:79:e3:1d:d8
Uploading stub...
Running stub...
Stub running...
Manufacturer: 20
Device: 4016
Detected flash size: 4MB
Hard resetting via RTS pin...

Solution

The first thing I did was get esp-idf and try it's hellow world. that worked.

then I googled somemore and someone said: set flash mode to DIO, not QIO.

Sure enough I was set to QIO , I set to DIO and suddenly stuff starts wirking.

note I'm betting that I did not choose the correct board in arduino ide board manager. I was faffing about with "ESP32 C3" , "ESP32 S3 mini", "ESP32 C3 Dev module".

the vendor's docs for esp-idf mention that with dev board "menuconfig" should have "disable multi cpu", this indicate that in arduino not using the "Dev Module" option might have some material difference.

Anywho, I can get the neo pixel hello world in arduino to work now, so I'm happy ( recall GPIO 8 is the address for the neo pixel lirbary to use for this board , same as the previous ESP32 that I used.

esp32 stuff

<a href="/index.php/File:Esp32-c3_devkitM-1_pinlayout.png" class="image"><img alt="Esp32-c3 devkitM-1 pinlayout.png" src="/images/e/e0/Esp32-c3_devkitM-1_pinlayout.png" decoding="async" width="400" height="300"></a>

so which pins are for I2C SDA/SCL ?

Lots of conflicting docs.

I forced the issue like this:

void setup() {
  Wire.setPins(sda_pin, scl_pin);
  Wire.begin();
...
}

want to make the on board neopixel work? use the neopixel library and set pin to 8.

Here is a web server that exposes BME 280 sensors in a prometheus friendly way:

https://github.com/drthornt/arduino_projects/blob/master/webserver_and_neopixel/webserver_and_neopixel.ino

• uses neopixel to communicate wifi communication status
• uses serial for diag debug output.

esp32 c3 dev module i2c pins :

if you use pins 6 and 7 yo ucahn define like this in the scanner program:

#define I2C_SDA 6
#define I2C_SCL 7

ESP32-C3 Mini Development Board

sparkfun board

aka WRL-18036

basedon ESP32-C3-MINI-1 chip

https://www.sparkfun.com/products/18036

gotchas:

set I2C wires to pin 0 and pin1 , means pin 9 and 10 on the board

#define I2C_SDA 0
#define I2C_SCL 1

...
void setup()
{
  Wire.setPins(I2C_SDA, I2C_SCL);
  Wire.begin();
  ...
}

Scripts

• /esp32_neo_pixel

• /esp32_i2c_scanner - it's possible to talk i2c over several pairs. In fact it's not clear if the default works. https://docs.espressif.com/projects/arduino-esp32/en/latest/tutorials/io_mux.html#usage-examples

• /esp32_bme680_http