ESP32 Voting Machine (WIP)

An Electronic Voting Machine with ESP32-S3, ESP-IDF and LVGL.

Key components:

• Elecrow board with 4 inch RGB display and ESP32-S3
• 4x4 membrane matrix keypad
• I2C IO expander for keypad
• Speaker
• REST API and Web interface for configuration
• SD Card to store data

Elecrow board with 5 inch RGB display and ESP32-S3

https://www.elecrow.com/esp32-display-5-inch-hmi-display-rgb-tft-lcd-touch-screen-support-lvgl.html

The Elecrow 5 inch display board has the following ports available

Port	Pin Number
GPIO_D	IO38
UART	RX(IO44); TX(IO43)
I2C	SDA(IO19); SCL(IO20)
Speaker (I2S)	I2S-CTRL; I2S-LRCLK(IO18); I2S-BCLK(IO42); I2S-SDIN(IO17)
SD Card Slot (SPI)	MOSI(IO11); MISO(IO13); CLK(IO12); CS(IO10)
LCD Backlight	IO2

4x4 Membrane Keypad

PCF8574 I2C IO Expander

Speaker