HardLabs

Openpayphone

eric-cgn·openpayphone·hardware/pcb/pphat.kicad_pcb

Openpayphone PCB layout, top view — open source Raspberry Pi board by eric-cgn

About the Openpayphone PCB

Openpayphone is an open source Raspberry Pi PCB design by eric-cgn, published on GitHub under the MIT license. It is a 2-layer board measuring 65 × 55 mm, with 38 components from 22 distinct parts.

Its main chip is the PI ZERO, from the Raspberry Pi family. Other key parts include the AG1171, LT1109CZ-12 and DRV8871DDAR. By type, the board carries 12 resistors, 9 capacitors, 8 connectors, 5 diodes, 3 ICs and 1 inductor.

From the project

a project to replace the internal components of an Ernest D3 COCOT payphone (~1996), with modern poe electronics and voip compatible sip client.

a project to replace the internal components of an Ernest D3 COCOT payphone (~1996), with modern poe electronics and voip compatible sip client.

configurable through a web interface with original payphone functionality including rate plan and deposit tracking

if you're interested in (perhaps too) much detail on how this came to be, i've documented the build here: part 1: new (old) phone, who 'dis?

Openpayphone, from the project README
From the project README

Main components on the Openpayphone

AG1171LT1109CZ-12DRV8871DDAR

Openpayphone bill of materials (BOM)

38 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AG1171
U1
1
LT1109CZ-12
U2
1
DRV8871DDAR
U3
1
PI ZERO
J1
1
FACEPLATE
J2
1
BELL
J3
1
COINRELAY
J4
1
COINSWITCH
J5
1
SPK
J6
1
MIC
J7
1
DEBUG
J8
4
SM4007
D1, D2, D3, D4
1
1N5818
D5
1
47UH
47uH
L1
3
0.1 uF
C1, C2, C3
3
0.1U
0.1u
C4, C5, C6
1
3300U
3300u
C7
1
10U
10u
C8
1
0.47 uF
C9
10
3k
R1, R2, R3, R4, R5, R6, R7, R9 +2
Show 2 more
QtyPartRefs
1
10K
10k
R8
1
30K
16k
R10

Openpayphone design files

The KiCad project lives in the eric-cgn/openpayphone repository on GitHub; these links point at the commit this page was built from.

Openpayphone: common questions

What microcontroller does the Openpayphone use?

The Openpayphone is built around the PI ZERO, from the Raspberry Pi family.

How big is the Openpayphone PCB?

The Openpayphone measures 65 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Openpayphone?

38 components, from 22 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 Openpayphone design files?

From the eric-cgn/openpayphone 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 Openpayphone design in my own project?

Yes, under the terms of its MIT license, which eric-cgn chose for the repository.

Can I test firmware for the Openpayphone without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.

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