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ESP32 TTGO

The ESP32 is a low-cost (under $10) microcontroller with both built-in WiFi and Bluetooth. This lab demonstrates using a version of the ESP32 that includes an integrated display.

Step 1: Install the USB to UART Bridge VCP Drivers

Follow the directions here:

https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers

Test this by running the ``ls -l /dev/cu*``` and verify you see:

/dev/cu.SLAB_USBtoUART

If you don't see this try to reboot.

Mac: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/establish-serial-connection.html https://github.com/loboris/MicroPython_ESP32_psRAM_LoBo/raw/master/MicroPython_BUILD/firmware/MicroPython_LoBo_esp32_all.zip

Step 2: Create a Python Conda Environment for ESP32

This is so we don't mess up other Python projects on your system.

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conda create -n esp32 python=3
conda activate esp32

Step #3: Install the esptool

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$ pip3 install esptool
Collecting esptool
  Downloading esptool-3.0.tar.gz (149 kB)
     |████████████████████████████████| 149 kB 2.9 MB/s 
     ...
Installing collected packages: pycparser, six, cffi, reedsolo, pyserial, ecdsa, cryptography, bitstring, esptool
Successfully installed bitstring-3.1.7 cffi-1.14.5 cryptography-3.4.6 ecdsa-0.16.1 esptool-3.0 pycparser-2.20 pyserial-3.5 reedsolo-1.5.4 six-1.15.0

Step 4: Erase the Old Firmware

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esptool.py --port /dev/cu.SLAB_USBtoUART erase_flash

Step 5: Download the New Firmware

Get the ESP32_All prebuilt binary:

https://github.com/loboris/MicroPython_ESP32_psRAM_LoBo/wiki/firmwares

Step 6: Reflash the new ESP32 Firmware

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cd esp32_all/
../flash.sh -p /dev/cu.SLAB_USBtoUART

this will run... 

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$ esptool.py --port /dev/cu.SLAB_USBtoUART erase_flash
esptool.py v3.0
Serial port /dev/cu.SLAB_USBtoUART
Connecting........_
Detecting chip type... ESP32
Chip is ESP32-D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 24:62:ab:ca:62:84
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in 2.5s
Hard resetting via RTS pin...

Configure Thonny

You must configure Thonny to use the ESP32.

Set the Serial Port

First, you must tell Thonny how to find the right port.

Set the Interpreter

Next, yo must tell Thonny to use the ESP32 interpreter.

Run a test

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import machine, display, time, math, network, utime


tft = display.TFT()
tft.init(tft.ST7789,bgr=False,rot=tft.LANDSCAPE, miso=17,backl_pin=4,backl_on=1, mosi=19, clk=18, cs=5, dc=16)

tft.setwin(40,52,320,240)

for i in range(0,241):
    color=0xFFFFFF-tft.hsb2rgb(i/241*360, 1, 1)
    tft.line(i,0,i,135,color) 

tft.set_fg(0x000000) 
tft.ellipse(120,67,120,67) 
tft.line(0,0,240,135) 

text="CoderDojo Rocks!" 
tft.text(120-int(tft.textWidth(text)/2),67-int(tft.fontSize()[1]/2),text,0xFFFFFF)

You should see the following on the ESP32 display:

References

https://www.instructables.com/TTGO-color-Display-With-Micropython-TTGO-T-display/