t1m0thyj / 24hr-Clock

24 hr Clock

Arduino

Materials

• Arduino Uno
• ESP8266 ESP-01 Wi-Fi board
• 5V DC to 3.3V DC converter
• Scroll pHAT HD
• Light dependent resistor (LDR)

Setup

Hardware

1. Attach the Scroll pHAT HD to the Arduino.
2. Wire the ESP8266 board using the DC-DC converter to provide power from the Uno's 5V pin.
3. Wire the LDR to analog pin A0.

Software

1. In Arduino IDE, install these libraries:
   • Adafruit IS31FL3731 Library
   • ezTime
   • WifiESP
2. Create an arduino_secrets.h file alongside the .ino file. In this file, define your Wi-Fi network name and password as follows:

   #define SECRET_SSID "<ssid>"
   #define SECRET_PASS "<password>"

3. Open the .ino file in Arduino IDE and flash it to the Uno.

Raspberry Pi

Materials

• Raspberry Pi
• Scroll pHAT HD
• Light dependent resistor (LDR)
• 1uF capacitor

Setup

Hardware

1. Attach the Scroll pHAT HD to the Pi (see pinout)
2. Wire the LDR and capacitor to GPIO pin #24 (see instructions)

Software

1. Install dependencies: pip3 install gpiozero scrollphathd
2. Run the script: python3 clock.py

Tips

1. To rotate the clock 180 degrees, run python3 clock.py flip
2. To run the script on boot, run crontab -e and add @reboot python3 /home/pi/clock.py