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Pico power board

ProjectLighthouseCAU·pico-power-board

Pico power board layout, top view — open source board by ProjectLighthouseCAU

About the Pico power board

Pico power board is an open source PCB design by ProjectLighthouseCAU, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 120 × 70 mm, with 105 components from 22 distinct parts.

Other key parts include the TMP112AIDRLR, INA219AxD, K7803-500R3 and 74LVC1G125GW,125. By type, the board carries 66 resistors, 13 capacitors, 10 connectors, 9 ICs, 6 fuses and 1 diode.

It belongs with the iot & wireless and sensors designs in this gallery.

From the project

This repository contains the schematic and PCB layout for the new Lighthouse power board that is compatible with the Pi Pico (with Wiznet W5100S or W5500) as a network controller

After looking at the SPI signal with an oscilloscope, we found out that the fast switching of voltage levels causes reflections on the end of the longer cables. These reflections interfere with each other constructively and cause ringing (voltage swings around the desired voltage at a rising/falling edge) and therefore over-/undershoot (voltage goes above/below the GPIO pins rated maximum/minimum voltage). While the SPI communication works and nothing broke yet, this over-/undervoltage could damage the GPIO pins or the whole microcontroller (both RP2040 and ATtiny841) in the long run. To fix…

Pico power board, from the project README
From the project README

Main components on the Pico power board

TMP112AIDRLRINA219AxDK7803-500R374LVC1G125GW,125

Pico power board bill of materials (BOM)

105 components, 22 distinct parts.

QtyPartRefs
1
TMP112AIDRLR
U1
1
INA219AxD
U2
1
K7803-500R3
U3
6
74LVC1G125GW,125
U4, U5, U6, U7, U8, U9
6
Conn_02x10_Counter_Clockwise
J1, J2, J3, J4, J5, J6
1
DC-042C-Z-2.5
J7
1
Conn_01x06_Male
J8
2
Conn_01x20_Female
J9, J10
6
Polyfuse
F1, F2, F3, F4, F5, F6
1
LED
D1
1
10nF
C1
9
100nF
C2, C3, C4, C8, C9, C10, C11, C12 +1
1
10uF
C5
1
22pF
C6
1
22uF
C7
30
100R
R1, R2, R3, R4, R5, R6, R7, R8 +22
6
27k
R13, R15, R17, R31, R33, R35
13
10k
R14, R16, R18, R32, R34, R36, R60, R61 +5
1
10m
R37
1
1k
R38
Show 2 more
QtyPartRefs
3
4.7k
R39, R40, R41
12
200R
R42, R43, R44, R45, R46, R47, R48, R49 +4

Pico power board design files

The KiCad project lives in the ProjectLighthouseCAU/pico-power-board repository on GitHub; these links point at the commit this page was built from.

Pico power board: common questions

How big is the Pico power board?

The Pico power board measures 120 × 70 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pico power board?

105 components, from 22 distinct parts. The full bill of materials is listed on this page.

Where can I download the Pico power board design files?

From the ProjectLighthouseCAU/pico-power-board repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Pico power board design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which ProjectLighthouseCAU chose for the repository.

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