HardLabs

Kitchen timer

timer-chefs·kitchen-timer·pcb/kitchen_timer-hardware.kicad_pcb

Kitchen timer PCB layout, top view — open source AVR/Arduino board by timer-chefs

About the Kitchen timer PCB

Kitchen timer is an open source AVR/Arduino PCB design by timer-chefs, published on GitHub. It is a 2-layer board measuring 60 × 110.8 mm, with 48 components from 19 distinct parts.

Its main chip is the ATMEGA328P-AU, from the AVR/Arduino family. Other key parts include the PEC11R-4215F-S0024 and MAX7219. By type, the board carries 20 resistors, 12 capacitors, 6 ICs, 5 diodes, 3 transistors and 1 speaker.

It belongs with the displays & leds and power & battery designs in this gallery.

From the project

A digital kitchen timer made from scratch

We're building a Kitchen timer! The project is heavily inspired by [REST: Kitchen timer by mkdxdx [Hackaday.io]](https://hackaday.io/project/194386-rest-kitchen-timer).

⏱️ Allows several timers to run in parallel ⚡ Is battery powered and power efficient 🔌 Charged by USB-C 💻 Programmable through the same USB port * 🐍 Easter eggs

Atmega328P as microcontroller Rotary encoder for setting the time 16x16 LED matrix as display 32 kHz crystal for accurate timekeeping * Passive buzzer for beeping

Main components on the Kitchen timer

ATMEGA328P-AUPEC11R-4215F-S0024MAX7219

Kitchen timer bill of materials (BOM)

48 components, 19 distinct parts.

QtyPartRefs
1
ATMEGA328P-AU
U5
1
PEC11R-4215F-S0024
U6
4
MAX7219
U7, U8, U9, U10
1
JSM2302
Q1
1
IRLML6402
Q2
1
MMBT3904
Q3
1
PS1240P02CT3
LS1
1
SKRPACE010
SW2
1
BAS40
D1
1
PMEG4010CEJ
D2
3
Red test LED
D3, D4, D5
7
100nF
C5, C6, C9, C13, C14, C15, C16
2
22pF
C7, C8
3
10nF
C10, C11, C12
9
10k
R1, R6, R8, R11, R12, R13, R14, R15 +1
5
1k
R7, R9, R10, R16, R17
4
62K
R18, R19, R20, R21
1
3.3M
R23
1
1M
R24

Kitchen timer design files

The KiCad project lives in the timer-chefs/kitchen-timer repository on GitHub; these links point at the commit this page was built from.

Kitchen timer: common questions

What microcontroller does the Kitchen timer use?

The Kitchen timer is built around the ATMEGA328P-AU, from the AVR/Arduino family.

How big is the Kitchen timer PCB?

The Kitchen timer measures 60 × 110.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Kitchen timer?

48 components, from 19 distinct parts. The full bill of materials is listed on this page.

Where can I download the Kitchen timer design files?

From the timer-chefs/kitchen-timer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Kitchen timer design in my own project?

The repository has no license, so all rights stay with timer-chefs. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Kitchen timer 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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