matriclock

Overview

matriclock is an alarm clock written in Micropython for Raspberry Pi Pico W.
See video on Youtube.

Features

• Time synchronization via worldtimeapi.org
• Time display in 12-hour clock or 24-hour clock format
• Alarm clock with an infinite number of alarm times
• Alarm on/off
• Snooze function
• Displaying day of week and day of month
• Displaying temperature (°C or °F) and relative humidity (optional)
• Display off / standby mode

Software prerequisites and installation

• Download and install recent Micropython firmware from micropython.org
• Download max7219.py from mcauser on github
• Customise config.py to your needs
• Set your Raspberry Pi Pico W to Bootloader mode
• Copy all Python files of this project and max7219.py to it

Parts

Count	Part
1	Raspberry Pi Pico WH Microcontroller
1	8x32 LED Matrix Display MAX7219
3	Buttons
1	DHT-22 Sensor (optional)
4	Resistors 10k (3 pull-down for the buttons, 1 pull-up for the DHT-22 sensor)
1	Piezo buzzer, active

Pinout

Part	Connection	RPi Pico	Connection
Button bn0	S0	27	GP21
	S1	36	3V3(OUT)
	10k	28	GND
Button bn1	S0	29	GP22
	S1	36	3V3(OUT)
	10kΩ	28	GND
Button bn2	S0	32	GP27
	S1	36	3V3(OUT)
	10kΩ	28	GND
Buzzer	S	34	GP28
	+	36	3V3(OUT)
	-	23	GND
Matrix LED	CLK	24	GP18
	DIN	25	GP19
	CS	22	GP17
	VCC	40	VBUS
	GND	23	GND
DHT22	DATA	19	GP14
	VCC	36	3V3(OUT)
	GND	23	GND

Buttons: Connect S0 to GPIO, S1 to 3V3, and place 10kΩ pull-down resistors between GND and the corresponding GPIO pin.
DHT22: Place a 10kΩ pull-up resistor between VCC and DATA of DHT22.

You can leave out the DHT22 sensor if you don't need the temperature/humidity display. Please also set use_dht_sensor = False in this case.

Operation

Press bn1 to toggle between time display and standby mode.
Press bn0 to toggle between time display, date display, and temperature/humidity display.
Press bn2 to toggle alarm on/off during time display.
Alarm: Press bn1 for snooze mode, or press bn2 to stop the alarm.