HardLabs

Fridge owl

HeyPCB·fridge-owl·kicad/fridge_owl.kicad_pcb

Fridge owl PCB layout, top view — open source AVR/Arduino board by HeyPCB

About the Fridge owl PCB

Fridge owl is an open source AVR/Arduino PCB design by HeyPCB, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 42 × 53.2 mm, with 10 components from 7 distinct parts.

Its main chip is the ATTINY412-SSNR, from the AVR/Arduino family. By type, the board carries 2 switches, 2 diodes, 2 capacitors, 2 resistors, 1 IC and 1 battery holder.

From the project

Hoot, the fridge reminder owl: The fridge owl that blinks at you until you've taken your meds and had your water. KiCad 10, heypcb.ai merch.

The fridge owl that blinks at you until you've taken your meds and had your water.

Hoot is a yellow owl-shaped fridge magnet with two reminders. Its left wing is a button marked "meds", its right wing "water". Press a wing when you have done the thing: that eye glows and its timer restarts. When the reminder comes due again (meds every 24 h or 12 h, water every 2 h), that orange LED eye blinks until you press. An ATtiny412 sleeps in power-down between one-second RTC ticks, so a CR2032 lasts about 14 months of typical use. Gold ENIG eye rings and beak on yellow mask; magnets go on the flat…

Fridge owl, from the project README
From the project README

Main components on the Fridge owl

ATTINY412-SSNR

Fridge owl bill of materials (BOM)

10 components, 7 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY412-SSNR
ATtiny412
U1
1
3034TR
CR2032
BT1
2
TS-1187A-B-A-B
TS-1187A
SW1, SW2
2
XL-1608UOC-06
Orange
D1, D2
1
CL21A106KAYNNNE
10uF
C1
1
CC0603KRX7R9BB104
100nF
C2
2
0603WAF2200T5E
220
R1, R2

Fridge owl design files

The KiCad project lives in the HeyPCB/fridge-owl repository on GitHub; these links point at the commit this page was built from.

Fridge owl: common questions

What microcontroller does the Fridge owl use?

The Fridge owl is built around the ATTINY412-SSNR, from the AVR/Arduino family.

How big is the Fridge owl PCB?

The Fridge owl measures 42 × 53.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Fridge owl?

10 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Fridge owl design files?

From the HeyPCB/fridge-owl repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Fridge owl design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which HeyPCB chose for the repository.

Can I test firmware for the Fridge owl without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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