

Head board
- Size
- 66 × 61.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 26
- Pads
- 121
- Tracks, vias
- 218, 10
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 11 Jan 2016
- Updated
- 29 Mar 2019
Overview
Head board is an open-source printed circuit board by lutzer, from the lutzer/HybridLetterbox repository on GitHub, published under the MIT licence. It is a 2-layer board of 66 × 61.1 mm with 23 parts on 26 nets, routed with 218 tracks and 10 vias.
It is built around the ATMEGA328P-PU and BC547. Its parts include 8 resistors, 8 connectors, 3 diodes, 2 transistors and 1 capacitor. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2README
README.mdHybrid Letterbox
Installation
- For instructions how to setup the raspberry pi from scratch see file: docs/pi-installation.md
Setup Letterbox for the first time
- go to HybridLetterbox dir and update to the newest version:
git pull - modify two config files
- go to src/server/node directory and copy config file:
cp config.defaultjs config.jsand modify file to your needs - go to src/letterbox/ and copy ini file:
cp letterbox.default.ini letterbox.iniand modify it to your needs
- go to src/server/node directory and copy config file:
Development
Python Test Scripts
- go to src folder and call testscripts by sudo
python2 -m letterbox.tests
Node Testscripts
-
install pm2
npm install pm2 -g -
go to
cd src/www- start testscripts by calling
npm test
- start testscripts by calling
Configure Atmega Head Board
Update
10.9.2016
-
edit
sudo nano /etc/systemd/system/letterbox.serviceand change value:text RemainAfterExit=false -
git pull -
start admin node script on port 9000
-
cd src/server/admin/ -
npm install -
cp config.default.js config.jsand adjust parameters in editornano config.js, these 3 parameters have to be changed:text /* AUTH DATA */ authName: 'admin', authPassword: 'password', sudoPassword: 'password' -
create startup script for admin server:
pm2 start main.js --name LetterboxBackendand savepm2 save
-
-
reboot with
sudo reboot -
access admin backend by going to
192.168.72.2:9000within your browser
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10 kOhm | Resistors_ThroughHole:Resistor_Horizontal_RM7mm | R2, R3, R4 |
| 2 | 100 Ohm | Resistors_ThroughHole:Resistor_Horizontal_RM7mm | R5, R6 |
| 2 | 330 Ohm | Resistors_ThroughHole:Resistor_Horizontal_RM7mm | R7, R8 |
| 2 | BC547 | TO_SOT_Packages_THT:TO-92_Inline_Wide | Q1, Q2 |
| 2 | D | Diodes_ThroughHole:Diode_DO-41_SOD81_Horizontal_RM10 | D2, D3 |
| 1 | 10 uF | Capacitors_ThroughHole:C_Radial_D5_L11_P2 | C1 |
| 1 | 56 Ohm | Resistors_ThroughHole:Resistor_Horizontal_RM7mm | R1 |
| 1 | ATMEGA328P-P | Housings_DIP:DIP-28_W7.62mm | IC1 |
| 1 | CAM_LEDS | Pin_Headers:Pin_Header_Straight_1x03 | P5 |
| 1 | FDBK_LED | Pin_Headers:Pin_Header_Straight_1x02 | P8 |
| 1 | LED | LEDs:LED-3MM | D1 |
| 1 | PI_CONN | Pin_Headers:Pin_Header_Straight_2x20 | P2 |
| 1 | PR | Pin_Headers:Pin_Header_Straight_1x02 | P4 |
| 1 | PR_LED | Pin_Headers:Pin_Header_Straight_1x02 | P7 |
| 1 | REED | Pin_Headers:Pin_Header_Straight_1x02 | P3 |
| 1 | SERIAL | Pin_Headers:Pin_Header_Straight_1x06 | P1 |
| 1 | STEPPER | Pin_Headers:Pin_Header_Straight_1x06 | P6 |
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Questions
How big is the Head board PCB?
It measures 66 × 61.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Head board use?
23 parts, built around the ATMEGA328P-PU and BC547. 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 Head board KiCad files?
From the lutzer/HybridLetterbox repository on GitHub, at the commit this page was made from: the board is resources/hardware/head_board/head_board.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Head board 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).