HardLabs

Pontag

hkzlab·pontag·schematics_pcb/pontag-proto-00/pontag.kicad_pcb

Pontag PCB layout, top view — open source AVR/Arduino board by hkzlab

About the Pontag PCB

Pontag is an open source AVR/Arduino PCB design by hkzlab, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 38.1 × 85.1 mm, with 35 components from 25 distinct parts.

Its main chip is the ATmega328P-PU, from the AVR/Arduino family. Other key parts include the L78L05_TO92 and MAX232. By type, the board carries 11 capacitors, 7 connectors, 5 diodes, 5 resistors, 3 ICs and 2 jumpers.

It belongs with the retro computing designs in this gallery.

From the project

PONTAG is an active adapter that converts a mouse using PS/2 protocol into an RS232 mouse (Microsoft protocol), commonly used on IBM XT/AT and compatibles.

Left mouse button pressed: Switches between simple Microsoft protocol and Microsoft protocol with wheel (DEFAULT: MS+Wheel) Right mouse button pressed: Switches mouse resolution, switching between 1, 2, 4 or 8 counts per mm traveled (DEFAULT: 4 counts per mm) Both buttons pressed**: Resets the board to defaults

Pin 1: The board will enter debug mode, and start printing debug strings on the serial port. It will NOT work as a mouse. Pin 2: If jumpered, the board enter power save mode after 3 minutes of mouse inactivity. Pin 3: If shorted, forces the use of the simple Microsoft protocol (2…

Pontag, from the project README
From the project README

Main components on the Pontag

L78L05_TO92ATmega328P-PUMAX232

Pontag bill of materials (BOM)

35 components, 25 distinct parts.

QtyPartRefs
1
L78L05_TO92
U1
1
ATmega328P-PU
U3
1
MAX232
U4
1
8.0Mhz
Y1
1
12V Selector
J1
1
External 12V
J2
1
RS232 Port
J3
1
PS/2 Mouse
J4
1
AVR-ISP-6
J5
1
External 5V
J6
1
Extra
J7
1
Btldr LED ENA
JP1
1
5V Internal
JP2
1
Reset
SW1
3
1N4148
D1, D2, D3
1
1N4001
D4
1
LED
D5
2
22pF
C1, C2
6
1.0uF
C3, C7, C8, C9, C10, C11
1
10nF
C4
Show 5 more
QtyPartRefs
2
100nF
C5, C6
1
1M
R1
1
470
R2
2
5K
R3, R4
1
10K
R5

Pontag design files

The KiCad project lives in the hkzlab/pontag repository on GitHub; these links point at the commit this page was built from.

Pontag: common questions

What microcontroller does the Pontag use?

The Pontag is built around the ATmega328P-PU, from the AVR/Arduino family.

How big is the Pontag PCB?

The Pontag measures 38.1 × 85.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pontag?

35 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Pontag design files?

From the hkzlab/pontag repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Pontag design in my own project?

Yes, under the terms of its GPL-3.0 license, which hkzlab chose for the repository.

Can I test firmware for the Pontag 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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