HardLabs

Rgb switcher

michaelobed·rgb-switcher·hardware/main_board/main_board.kicad_pcb

Rgb switcher PCB layout, top view — open source AVR/Arduino board by michaelobed

About the Rgb switcher PCB

Rgb switcher is an open source AVR/Arduino PCB design by michaelobed, published on GitHub under the MIT license. It is a 4-layer board measuring 360 × 200 mm, with 129 components from 49 distinct parts.

Its main chip is the ATMEGA328PB-A, from the AVR/Arduino family. Other key parts include the L7805, SN74CBT3244CPW, 74HC138, 74HC04 and 74HC238. By type, the board carries 32 transistors, 22 connectors, 20 switches, 20 capacitors, 16 ICs and 10 resistors.

It belongs with the audio and retro computing designs in this gallery.

From the project

An open-source switcher for analogue RGBS video, so you don't have to.

Here's the KiCad design file for the board. I've included all required libraries as a lot of the components I had to find or make from scratch. I've also included a bill of materials (BOM) for reference, made to be compatible with JLCPCB's particular format. Bear in mind that you don't absolutely have to use the parts referenced in there if they aren't in stock on LCSC, or if you can source them from elsewhere, or if better/cheaper alternatives will work.

Main components on the Rgb switcher

ATMEGA328PB-AL7805SN74CBT3244CPW74HC13874HC0474HC238

Rgb switcher bill of materials (BOM)

129 components, 49 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA328PB-A
ATmega328PB-A
U1
1
L7805
U2
9
SN74CBT3244CPW
U3, U4, U7, U8, U9, U10, U11, U12 +1
1
74HC138
U5
1
74HC04
U6
3
74HC238
U14, U15, U16
32
IRF540N
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +24
1
rgb 0
J1
1
+12v 3a in
J2
1
KMDGX-9S-N
input 0
J3
1
KMDGX-9S-N
input 1
J4
1
icsp
J5
1
rgb 1
J6
1
KMDGX-9S-N
input 2
J7
1
KMDGX-9S-N
input 3
J8
1
rgb 2
J9
1
uart
J10
1
KMDGX-9S-N
input 4
J11
1
KMDGX-9S-N
input 5
J12
1
rgb 3
J13
Show 29 more
QtyPartRefs
1
+5v out
J14
1
rgb 4
J15
1
KMDGX-9S-N
input 6
J16
1
KMDGX-9S-N
input 7
J17
1
rgb 5
J18
1
KMDGX-9S-N
rgb output
J19
1
KMDGX-9S-N
ypbpr output
J20
1
rgb 6
J21
1
rgb 7
J22
8
rgb/ypbpr
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8
1
on/off
SW9
1
prev
SW10
1
next
SW11
9
csync/rgbs
SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19 +1
1
power
D1
1
output 0 on
D2
1
output 1 on
D3
1
output 2 on
D4
1
output 3 on
D5
1
output 4 on
D6
1
output 5 on
D7
1
output 6 on
D8
1
output 7 on
D9
18
100N
100n
C1, C2, C4, C5, C7, C8, C9, C10 +10
1
10U
10u
C3
1
100U
100u
C6
1
10K
10k
R1
1
6K8
6k8
R3
8
680
1k
R5, R6, R7, R8, R9, R10, R11, R12

Rgb switcher design files

The KiCad project lives in the michaelobed/rgb-switcher repository on GitHub; these links point at the commit this page was built from.

Rgb switcher: common questions

What microcontroller does the Rgb switcher use?

The Rgb switcher is built around the ATMEGA328PB-A, from the AVR/Arduino family.

How big is the Rgb switcher PCB?

The Rgb switcher measures 360 × 200 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Rgb switcher?

129 components, from 49 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 Rgb switcher design files?

From the michaelobed/rgb-switcher 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 Rgb switcher design in my own project?

Yes, under the terms of its MIT license, which michaelobed chose for the repository.

Can I test firmware for the Rgb switcher 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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