PIOI I/O interface module

pozsarzs·zacchaeus·Zacchaeus computer/hardware/PIOI IO Interface module/pioi/pioi.kicad_pcb

PIOI I/O interface module layout, top view — open source board by pozsarzs

About the PIOI I/O interface module

PIOI I/O interface module is an open source PCB design by pozsarzs, published on GitHub under the EUPL-1.2 license. It is a 2-layer board measuring 238.5 × 59.7 mm, with 83 components from 20 distinct parts.

Other key parts include the 4N25, 74LS14 and 74LS05. By type, the board carries 26 resistors, 23 diodes, 10 connectors, 8 transistors, 6 ICs and 4 relays.

It belongs with the retro computing designs in this gallery.

From the project

8-bit microcomputer built from commercially available and home-built components

The PIOI is a combined interface module originally built for another device. It has 4 isolated 5..12V digital inputs, 4 open collector outputs and 4 NC/NO relay contact outputs. The module requires +5V DC to operate.

The color-coded connectors for the inputs and outputs and the LEDs with optical fiber are on the front panel. The color of the inputs is green, the color of the outputs is yellow, the GND is black. The ground of the inputs and the ground of the device are not connected.

PIOI I/O interface module, from the project README — From the project README

Main components on the PIOI I/O interface module

4N25 74LS14 74LS05

PIOI I/O interface module bill of materials (BOM)

83 components, 20 distinct parts.

Qty	Part	Footprint	Refs
4	4N25	DIP-6_W7.62mm_LongPads	U1, U2, U3, U4
1	74LS14	DIP-14_W7.62mm_LongPads	U5
1	74LS05	DIP-14_W7.62mm_LongPads	U6
8	BC548C	TO-92_Rugged	Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8
2	Screw_Terminal_1x05	bornier5	J1, J10
4	Screw_Terminal_1x04	bornier4	J2, J3, J4, J5
4	Screw_Terminal_1x03	bornier3	J6, J7, J8, J9
1	Jumper_NC_Small	Socket_Strip_Straight_1x02_Pitch2.54mm	JP1
1	Jumper_NO_Small	Socket_Strip_Straight_1x02_Pitch2.54mm	JP2
4	LEG-5	relay_leg	K1, K2, K3, K4
9	1N4001	D_DO-41_SOD81_P10.16mm_Horizontal	D1, D2, D3, D4, D9, D19, D20, D21 +1
14	LED	LED_D3.0mm	D5, D6, D7, D8, D10, D11, D12, D13 +6
2	100n	C_Rect_L7.0mm_W2.5mm_P5.00mm	C1, C2
1	470u	CP_Radial_D8.0mm_P3.50mm	C3
1	4.7u	CP_Radial_D5.0mm_P2.50mm	C4
4	1.8k	R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal	R1, R2, R3, R4
8	4.7k	R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal	R5, R6, R7, R8, R9, R11, R13, R15
4	750	R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal	R10, R12, R14, R16
9	620	R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal	R17, R18, R19, R20, R22, R23, R24, R25 +1
1	1k	R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal	R21

PIOI I/O interface module design files

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

PIOI I/O interface module: common questions

How big is the PIOI I/O interface module?

The PIOI I/O interface module measures 238.5 × 59.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the PIOI I/O interface module?

83 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the PIOI I/O interface module design files?

From the pozsarzs/zacchaeus repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the PIOI I/O interface module design in my own project?

Yes, under the terms of its EUPL-1.2 license, which pozsarzs chose for the repository.

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