HardLabs

Inki

c0de111·tinta·hardware/circuit/legacy/inki.kicad_pcb

Inki PCB layout, top view — open source Raspberry Pi board by c0de111
Simulate this board

About the Inki PCB

Inki 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 54 components from 22 distinct parts.

Its main chip is the SC0918, from the Raspberry Pi family. Other key parts include the DS3231M, BMP581 and RV-3028-C7. By type, the board carries 22 resistors, 8 diodes, 8 capacitors, 6 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 repository contains the electronic schematic and hardware documentation for the inki project — a battery-powered, low-power circuit employing a Raspberry Pi Pico W and a DS3231 RTC module for wireless ePaper display - as for instance for room signage.

In the default state of the circuit, Q1 is in the off-state and the Pico does not get any supply voltage. Two events can switch Q1 on via its gate and thus power the Pico: An alarm from the RTC DS3231 via its INT pin, or a manual trigger via pushbutton #0. If this happens, the Pico will start, and as a first action in its program pull down…

Inki, from the project README
From the project README

Main components on the Inki

DS3231MBMP581RV-3028-C7

Inki bill of materials (BOM)

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

QtyPartRefs
1
DS3231M
U1
1
BMP581
U2
1
RV-3028-C7
U3
2
TSM260P02CX
Q1, Q3
2
MMBT3904
Q2, Q4
1
connector epaper
J1
5
CONN_01X02_SOCKET
Conn_01x02_Socket
J2, J3, J4, J5, J7
1
SW_DIP_X04
SW_DIP_x04
SW1
1
Battery 3,7V
battery_RTC1
1
SC0918
pico1
7
BAT54J
D1, D3, D4, D5, D6, D7, D8
1
1N4148WS
D2
8
100NF
100nF
C1, C2, C3, C4, C5, C6, C7, C8
4
200K
200k
R1, R7, R8, R14
1
1M
R2
2
4K7
4k7
R3, R4
6
1k
R5, R10, R11, R12, R13, R21
1
220R
R6
2
50K
50k
R9, R22
1
2M2
R15
Show 2 more
QtyPartRefs
1
22R
R16
4
10K
10k
R17, R18, R19, R20

Inki 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: common questions

What microcontroller does the Inki use?

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

How big is the Inki PCB?

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

How many components are on the Inki?

54 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 Inki 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 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 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.

More boards in tinta

Similar boards