2 layers85 × 67 mm
Gaggimate
dulerabbit/GaggiBre-legacy
This is GaggiBre! a fork of Gaggimate with Manual Brew Control and Adaptive Mode. Made by Dule Rabbit
113 parts8
2 layers68 × 35 mm
Gaggia - Shotwatch
douwepausma/shotwatchDisplay the brewing time of your GAGGIA Classic Pro with Shotwatch.
- Size
- 68 × 35 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 4
- Nets
- 26
- Pads
- 34
- Tracks, vias
- 19, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 11 Oct 2025
- Updated
- 16 Mar 2026
Overview
Gaggia - Shotwatch is an open-source printed circuit board by douwepausma, from the douwepausma/shotwatch repository on GitHub, published under the MIT licence. It is a 2-layer board of 68 × 35 mm with 4 parts on 26 nets, routed with 19 tracks and 0 vias.
It is built around the HLK-10M05. Its parts include 2 ICs and 1 connector.
Main components
1README
README.mdShotwatch
Display the brewing time of your GAGGIA Classic Pro with Shotwatch ☕️⏱️. This handy DIY gadget allows to display the amount of seconds your GAGGIA has been running on display.
'Shotwatch' is a combination of the words 'Espresso Shot' and 'Stopwatch'
Why?
Many times I've either forgot to start counting our lost count (counting till 20 is hard okay) for how long my shot was running for. So I thought 'why not make something that does this for me?' After some Googling I quickly found solutions to this problem online, ones that I could purchase and install myself. They were however quite expensive, and this project sounded like something I could handle myself and learn a thing or two. So I opted to do it myself. In the end I probably spend more time and money prototyping then when I would've bought a solution, but what's the fun in that?! And (spoiler alert) I even learned how to make my own pcb in this project! Read more about it in the blog post on my website.
How does it work?
The Shotwatch is quite simple and consists out of only 2 components, the screen and the logic board. The logic board is hooked up in series with two wires behind the brewing switch, this turns the Shotwatch on and automatically starts counting. The number is displayed on a small OLED screen connected to the logic board. Logic board is an Arduino Pro Micro, and powered with current directly coming via the brewing switch itself. GAGGIA Classic Pro's internals are all 230 AC current, so the I created a pcb where the logic board is mounted onto that houses a transformer to get the appropriate volts and wattage.
Bill of materials
In addition to the 3 printed parts and the Shotwatch PCB, the following parts are required. You can find all the parts below on AliExpress. Concerning the Shotwatch PCB, you can get this manufactured at PCBWay with the gerber files. And you can print the STL files for the case yourself, or find a place where you can get them printed.
| Part | Amount |
|---|---|
| HLK-10M05(10W 5V) | 1x |
| Arduino Pro Micro | 1x |
| Header pins 2x12 | 2x |
| SSD1315 Oled screen | 1x |
| 4pin JST female connector | 1x |
| 4pin JST male connector | 2x |
| KF128 5.08MM pitch, 2 port screw terminal | 1x |
| 30cm 4 wire ribbon cable | 1x |
| 30cm 18 AWG cable | 2x |
| Piggyback connecter (with insulation) | 2x |
Assembly
https://github.com/user-attachments/assets/8fb99642-29bd-4e3d-afc3-6cd245b8583b
Shotwatch in action
https://github.com/user-attachments/assets/95962a83-e972-49d3-940f-4a79777042f4
Parts
4| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | HLK-10M05 | Converter_ACDC:Converter_ACDC_Hi-Link_HLK-10Mxx | PS1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1 |
| 1 | ~ | My_Footprints:4_Through_Hole_Pads | U2 |
| 1 | ~ | My_Footprints:Pro Micro | U1 |
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Questions
How big is the Gaggia - Shotwatch PCB?
It measures 68 × 35 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Gaggia - Shotwatch use?
4 parts, built around the HLK-10M05. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Gaggia - Shotwatch KiCad files?
From the douwepausma/shotwatch repository on GitHub, at the commit this page was made from: the board is gerber/Gaggia - Shotwatch.kicad_pcb and its schematic gerber/Gaggia - Shotwatch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Gaggia - Shotwatch design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).