HardLabs

Pi super ups

mairas·pi-super-ups·hardware/pi-supercap-ups.kicad_pcb

Pi super ups PCB layout, top view — open source AVR/Arduino board by mairas

About the Pi super ups PCB

Pi super ups is an open source AVR/Arduino PCB design by mairas, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 65 × 56 mm, with 86 components from 50 distinct parts.

Its main chip is the ATtiny841-SSU, from the AVR/Arduino family. Other key parts include the MCP25625T-E_ML, TPS61022, DS3231MZ, MP1584EN and MT9700. By type, the board carries 31 resistors, 22 capacitors, 8 ICs, 8 diodes, 5 connectors and 5 test points.

It belongs with the power & battery designs in this gallery.

From the project

Power Monitor for Raspberry Pi and SignalK

The KiCad design files are in the hardware subdirectory. They are still untested and no suitability for any purpose is claimed.

The hardware needs some ATTiny13a code to correctly control the wakeup pin (GPIO3) state. This is still to be written!

pi-super-ups is a simple power monitor for Raspberry Pi. It monitors a defined GPIO pin on the Raspberry Pi. If the pin goes high for ten seconds, a shutdown is triggered. Using GPIO 3 is highly recommended because that allows for automatic restarting when power is restored (pulling GPIO 3 low powers on the device if it is powered off).

Pi super ups, from the project README
From the project README

Main components on the Pi super ups

MCP25625T-E_MLATtiny841-SSUTPS61022DS3231MZMP1584ENMT9700

Pi super ups bill of materials (BOM)

86 components, 50 distinct parts.

QtyPartRefs
2
MCP25625T-E_ML
IC1, IC2
1
ATtiny841-SSU
U1
1
TPS61022
U2
1
DS3231MZ
U4
1
MP1584EN
U5
2
MT9700
U6, U7
1
S3D8.000000B20F30T
X1
1
Screw_Terminal_01x04
J1
1
Raspberry_Pi_2_3
J2
1
Conn_02x07_Counter_Clockwise
J3
1
Screw_Terminal_01x02
J4
1
Screw_Terminal_01x03
J5
1
CR1220 3V
BT1
1
1A
F1
1
Term
JP2
1
SW_SPST
SW1
1
+12V_prot
TP1
1
GND
TP2
1
Vcap
TP3
1
OSC
TP5
Show 30 more
QtyPartRefs
1
Vbuck
TP8
1
SMF16CA
D1
2
DS34W
D2, D12
3
RLED
D3, D5, D11
1
BAT54C
D4
1
GLED
D7
1
4.7uH 3.5A
L1
1
1uH
L2
5
47uF 10V
C1, C6, C16, C17, C19
10
100nF
C2, C3, C4, C5, C9, C10, C11, C14 +2
1
100n
C8
1
10uF 50V
C13
1
150pF
C15
4
10uF 10V
C20, C21, C22, C23
1
4.7k
R1
8
10k
R2, R7, R19, R21, R24, R25, R29, R30
1
2.2k
R3
4
0
R4, R5, R6, R8
2
1.5k
R9, R10
2
120R
R11, R31
1
200k
R12
1
54.9k
R13
1
93k
R14
1
40.2k
R15
1
330k
R16
1
43k
R17
2
4.53k
R18, R23
3
100k
R20, R22, R27
1
68k
R26
1
7.5k
R28

Pi super ups design files

The KiCad project lives in the mairas/pi-super-ups repository on GitHub; these links point at the commit this page was built from.

Pi super ups: common questions

What microcontroller does the Pi super ups use?

The Pi super ups is built around the ATtiny841-SSU, from the AVR/Arduino family.

How big is the Pi super ups PCB?

The Pi super ups measures 65 × 56 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pi super ups?

86 components, from 50 distinct parts. The full bill of materials is listed on this page.

Where can I download the Pi super ups design files?

From the mairas/pi-super-ups repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Pi super ups design in my own project?

Yes, under the terms of its BSD-3-Clause license, which mairas chose for the repository.

Can I test firmware for the Pi super ups 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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