SierraClockEsp32

ESP32-C3 based clock/weather display for Ford Sierra vehicles. Port of SierraClock from Arduino Nano to ESP32-C3 with PlatformIO.

Features

• Clock with manual time setting
• Temperature and humidity display (BME280)
• SIERRA logo
• About screen

Apps

App	Description
Clock	Time display, OK to set time
Weather	Temperature and humidity
About	Author info
Logo	SIERRA logo

Buttons

Button	GPIO	Function
BTN1 (OK)	GPIO 3	Select / increment hours
BTN2 (NEXT)	GPIO 4	Navigate / switch to minutes

Hardware

• ESP32-C3 DevKitC-02
• BME280/BMP280 sensor (I2C, address 0x76)
• SH1106G OLED 128x64 (I2C, address 0x3C)
• 2 buttons (active LOW, internal pull-up)

Wiring (ESP32-C3)

Function	GPIO
I2C SDA	8
I2C SCL	9
Button 1 (OK)	3
Button 2 (NEXT)	4

Display and BME280 share the same I2C bus.

Build and Upload

Requires PlatformIO.

# Build
pio run

# Upload
pio run -t upload

# Serial monitor
pio device monitor

Comparison with Original SierraClock (Arduino Nano)

	SierraClock (Nano)	SierraClockEsp32 (C3)
MCU	ATmega328P (8-bit AVR)	ESP32-C3 (32-bit RISC-V)
RAM	2 KB	320 KB (x160)
Flash	32 KB	1 310 KB (x41)
Build system	arduino-cli	PlatformIO
Serial	9600 baud	115200 baud
I2C pins	A4/A5 (fixed)	GPIO 8/9 (configurable)
Buttons	D2/D3	GPIO 3/4
Wi-Fi	No	Yes (built-in)
BLE	No	Yes (built-in)

Future Plans

• Wi-Fi + NTP time sync
• TPMS tire pressure monitoring via CC1101 433 MHz (see TPMS_INTEGRATION.md)