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Inki l2

c0de111·tinta·hardware/circuit/inki_l2.kicad_pcb

Inki l2 PCB layout, top view — open source Raspberry Pi board by c0de111
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About the Inki l2 PCB

Inki l2 is an open source Raspberry Pi PCB design by c0de111, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 47.2 × 55.5 mm, with 60 components from 40 distinct parts.

Its main chip is the SC0918, from the Raspberry Pi family. Other key parts include the BMP581, RV-3028 and ST25. By type, the board carries 22 resistors, 13 capacitors, 11 diodes, 5 connectors, 4 transistors and 3 ICs.

It belongs with the iot & wireless, displays & leds and power & battery designs in this gallery.

From the project

Battery-powered e-paper sign: room signage, sensor graphs, home automation, or anything over Wi-Fi. Wakes by real-time clock, NFC tap, or button. Raspberry Pi Pico W firmware, custom PCB, and 3D-printed case included.

This directory contains the schematic and hardware documentation for the Tinta PCB. There is also a former hand-solderable design, see legacy/.

The Tinta circuit is designed for long-term operation (years) using 3×AAA or 3×AA batteries. It uses a real-time clock for accurate timekeeping and wake-up scheduling — either a DS3231 or RV-3028, detected automatically at runtime — combined with MOSFET-based power switching to fully disconnect the controller between wake cycles. During wake cycles, information is fetched via Wi-Fi and displayed on an ePaper display that retains its content without…

Inki l2, from the project README
From the project README

Main components on the Inki l2

BMP581RV-3028ST25

Inki l2 bill of materials (BOM)

60 components, 40 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
BMP581
U2
1
RV-3028
U4
1
ST25
U5
2
TSM260P02CX
2602
Q1, Q3
2
MMBT3904
3904
Q2, Q4
1
connector epaper
J1
1
CONN_01X02_SOCKET
antenna
J2
1
CONN_01X02_SOCKET
Battery 3xAA/AAA
J3
1
pushbuttons
J6
1
CONN_01X02_SOCKET
status LED
J7
1
Coin Cell (RTC Backup)
BT1
1
SC0918
pico1
7
BAT54J
D1, D3, D4, D5, D6, D7, D8
1
1N4148WS
BAT54J
D2
2
BAT54J
D10, D11
1
1N4148
D12
1
100NF
22nF
C1
7
100NF
100nF
C2, C3, C4, C5, C6, C7, C8
1
4.7uF
C9
2
100nF
C10, C13
Show 20 more
QtyPartRefs
1
10pF
C11
1
JZ400
C12
1
200K
1M
R1
3
1k
R2, R13, R21
1
4K7
50k
R3
1
4K7
200k
R4
1
200k
R5
1
220R
4k7
R6
1
200K
4k7
R7
1
200K
10k
R8
1
50K
10k
R9
2
10k
R10, R11
1
220R
R12
1
200K
1k
R14
1
2M2
1k
R15
1
22R
1k
R16
2
10K
200k
R17, R18
1
10K
2M2
R19
1
10K
22R
R20
1
50K
50k
R22

Inki l2 design files

The KiCad project lives in the c0de111/tinta repository on GitHub; these links point at the commit this page was built from.

Inki l2: common questions

What microcontroller does the Inki l2 use?

The Inki l2 is built around the SC0918, from the Raspberry Pi family.

How big is the Inki l2 PCB?

The Inki l2 measures 47.2 × 55.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Inki l2?

60 components, from 40 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 Inki l2 design files?

From the c0de111/tinta 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 Inki l2 design in my own project?

Yes, under the terms of its Apache-2.0 license, which c0de111 chose for the repository.

Can I test firmware for the Inki l2 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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