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2 layers40 × 66 mmSCHW, the printed circuit board in 3D

Board games score counter device

Size
40 × 66 mm
Copper layers
2
Thickness
1.6 mm
Parts
18
Nets
25
Pads
72
Tracks, vias
126, 20
Pours
2
Routed
Yes
KiCad
KiCad 5 (file 20171130)
Created
25 Jun 2020
Updated
1 Jul 2020

Overview

SCHW is an open-source printed circuit board by deelbg, from the deelbg/score_counter repository on GitHub, published under the MIT licence. It is a 2-layer board of 40 × 66 mm with 18 parts on 25 nets, routed with 126 tracks and 20 vias.

Its parts include 3 capacitors, 3 resistors, 2 connectors and 1 IC.

README

README.md

score_counter

Score Counter

Also available on my online store.

Board games Score Counter is a device meant to be used for keeping the score for up to four players when playing board games like Scrabble etc. The numbers of players is selectable through the settings menu. Names up to ten characters long can be entered for each player. For each player an accumulated score is stored, which is the total amount of points up to the current moment in the game, and the points from the current round are entered using a rotary encoder or the Up and Down arrow keys. When OK is pressed the point from the current round are added to the total amount. More detailed explanation and screenshot might be found in the User manual HERE or on my web site HERE

Main features.

  • Small size (10cm / 5.5cm / 1.7cm).
  • Battery powered. Runs on two AAA batteries.
  • 1.3” OLED screen.
  • Controlled via five buttons and a rotary switch.
  • 3D printed enclosure.
  • Energy independent memory to store settings and player names.

In the /firmware directory is located the firmware. It uses the drivers from my SSD1306_SH1106_i2c_text_display and hal_lib_avr_cpp repositories. The device is based on a Attiny861 microcontroller.

There is a makefile included. Run the folowing:

  • make - to build the project
  • clean - to delete object files
  • size - to see the used RAM and flash.
  • flash - to write the .hex file to the microcontroller. Using avrdude and a usbasp programmer.
  • eeprom - to write the eeprom.
  • fuse - to write the fuses.

In the /hardware directory is located the hardware project for EagleCad and a KiCad export. NOTE: A 10kOhm pullup resistor needs to be added to the OK button (the one right in the center).

In the /enclosure directory is located a FreeCad project containig the enclosure. The 3 parts are also exported in .obj files that can be directly imported in Cura and sliced for 3d printing.

Parts

18
QtyValueFootprintReferences
4@HOLE0, @HOLE1, @HOLE2, @HOLE3
3100nSCHW:C0805C1, C2, C3
210KSCHW:R0805R2, R3
2SJ2WSCHW:SJ_2J1, J2
110kSCHW:R0805R1
1AP2306GN_MOSFETSOT23SCHW:SOT23T1
1ENCODER_ARROWSSCHW:ENCODER_ARROWSBUTTONS1
1PINHD-1X2SCHW:1X02POWER1
1PINHD-1X4SCHW:1X04OLED1
1PINHD-1X6SCHW:1X06PROG1
1TINY26SSCHW:SO20LIC1

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Questions

How big is the SCHW PCB?

It measures 40 × 66 mm and has 2 copper layers, 1.6 mm thick.

What parts does the SCHW use?

18 parts. 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 SCHW KiCad files?

From the deelbg/score_counter repository on GitHub, at the commit this page was made from: the board is hardware/SCHW.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the SCHW 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).