This project is intended to be a low power clock, suitable to use as a travel clock, and also suitable as a room clock.

This unit uses an E-Paper display, along with an RPi2040 processor, and is powered by a LiPo battery. An on-board battery charger is present, this charges the battery using a USB power source.

The processor only updates the display once per minute, and hibernates between updates to maximise the battery life.

The unit updates it’s time once a day from the internet.

A diagnostic mode / interface is also built-in, this allows a pair of Wi-Fi access Point SSID/Passwords to be entered/stored.

PCBs

Cricket2-Main-PCB-Front

Cricket2-Main-PCB-Back

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Lists

The LiPo battery is a salvaged unit from an e-cigarette.
1

E-Paper-Clock_Prototype

USB connectors

Three USB connectors are present.

1 The RP2040 USB connector can power the unit, it’s also used to program the RP2040.
2 The TP4056 board USB is for charging the LiPo battery.
3 The externally available USB is for day to day running of the clock from an external power source. ***

Tables

Small Table (centered)

Fruits(not aligned)	Alignment (centered)	num (right align)
Apple	centered	9999
Banana	centered long text	999
Orange	centered	99
Lemon	centered	9

Wide Table (centered)

scroll enabled when page is narrow

Fruits	num (left align)	num (right align)	num	num	num
Apple	1111	1111	2222	3333	4444
Banana	111	111	222	333	444
Orange	11	11	22	33	44
Lemon	1	1	2	3	4

Wider Table

scroll enabled when page is narrow

Fruits	num (left align)	num (right align)	num	num	num	num	num	num
Apple	1111	1111	2222	3333	4444	5555	6666	7777
Banana	111	111	222	333	444	555	666	777
Orange	11	11	22	33	44	55	66	77
Lemon	1	1	2	3	4	5	6	7

Code

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for i in range(5, 10):
  print(i)

Quote

for i in range(5, 10):
  print(i)