An ESP32 with a 3.5" (480*320) TFT with Capacitive Touch
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The ESP32 TouchDown ESP32 TouchDown is complete solution for anyone who wants/needs an ESP32 with capacitive touchscreen. It also has battery management onboard, a piezo speaker, and an SD card rea...
Read More…The ESP32 TouchDown
ESP32 TouchDown is complete solution for anyone who wants/needs an ESP32 with capacitive touchscreen. It also has battery management onboard, a piezo speaker, and an SD card reader. ESP32 TouchDown works out of the box with the Arduino IDE, providing you have installed the ESP32 Arduino Core. Pins that are not used by the peripherals onboard are broken out.
FreeTouchDeck
The ESP32 TouchDown is designed with FreeTouchDeck (https://github.com/DustinWatts/FreeTouchDeck) in mind. The ESP32 TouchDown is the one stop solution to get a FreeTouchDeck up and running with capacitive touch without the need to buy separate modules. You have the option to get your ESP32 TouchDown shipped to you with the most current release of FreeTouchDeck installed!
Write your own software
The ESP32 TouchDown can be used for more the FreeTouchDeck alone. It is a fully featured DevKit. In the Github repository you will find some examples to get you started:
Portability
The ESP32 TouchDown can run of a Li-Po battery. Combined with WiFi and BLE this makes the ESP32 TouchDown very portable. It uses an MCP73831 Charge Management Controller set to a charge current of 330mA. Charging is done through the USB-C port (using 5V). The on/off switch doesn't effect the battery charging. So even when the ESP2 TouchDown is off, you can still charge the battery. When the ESP32 TouchDown is plugged in to USB, it will use USB power over battery power and will switch to battery power when USB is disconnected, without interrupting the ESP32.
Note: Always use a protected cell!
TFT screen
ESP32 TouchDown uses a 3.5" TFT screen with a resolution of 480x320. The driver is an ILI9488. Pins used by the TFT screen are:
The TFT backlight anode (positive supply) is selectable via a jumper on the back. You can either power it directly from 3.3V or use GPIO32. By default, the positive source is 3.3V. You can change this and use PWM to control the backlight brightness. If you choose to have your ESP32 TouchDown shipped with FreeTouchDeck, the jumper will already be set so you can dim the backlight from the software.
Capacitive Touch
The capacitive touch controller is a FocalTech FT6236 (datasheet). The FT6236 uses I2C and has address 0X38. I made an Arduino IDE library available here: https://github.com/DustinWatts/FT6236.
Pins used by the FT6236 are:
GPIO Breakout
The following GPIO's are broken out on the header:
Why is it so special?
ESP32 TouchDown comes ready to use. It includes all features that you would need additional modules for when using a development board. Besides that, ESP32 TouchDown is fully open source. All hardware designs can be found in the Github repository. ESP32 TouchDown is also OSHWA cerftified. You can find more information here: https://certification.oshwa.org/nl000004.html
Batch information
Batch 2 (27th of February 2021): Currently being produced...
Batch 1 (16th of February 2021): PCB manufacturer: PCBWay, Parts source: LCSC, Hand assembled.
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Utrecht, Utrecht, Netherlands
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