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Canary

michael-michelotti·canary·pcb/canary.kicad_pcb

Canary PCB layout, top view — open source Raspberry Pi board by michael-michelotti

About the Canary PCB

Canary is an open source Raspberry Pi PCB design by michael-michelotti, published on GitHub. It is a 2-layer board measuring 65 × 56 mm, with 22 components from 15 distinct parts.

Its main chip is the Raspberry_Pi_4, from the Raspberry Pi family. Other key parts include the TMP119AIYBGR, BMP388, SGP40-D-R4, SHT4x and CAT24C32WI-GT3. By type, the board carries 8 capacitors, 5 ICs, 5 resistors, 2 connectors and 2 diodes.

It belongs with the sensors and dev boards & breakouts designs in this gallery.

From the project

Raspberry Pi air quality HAT with a custom Linux IIO kernel driver for the Sensirion SGP40.

An indoor air quality HAT for the Raspberry Pi 4 — custom PCB, custom Linux kernel driver, end-to-end MQTT pipeline.

Canary measures temperature, humidity, pressure and VOCs through four I2C sensors on a Pi-mounted HAT and features:

- A custom IIO kernel driver for the Sensirion SGP40, with the Sensirion VOC Index Algorithm ported into kernel space - A custom TMP119 driver, forked from the upstream tmp117.c to handle the TMP119 device ID - A device-tree-driven bring-up of the remaining sensors using upstream Linux drivers (sht4x, bmp280) - A self-heating compensation model calibrated using…

Canary, from the project README
From the project README

Main components on the Canary

TMP119AIYBGRBMP388SGP40-D-R4SHT4xCAT24C32WI-GT3

Canary bill of materials (BOM)

22 components, 15 distinct parts.

QtyPartRefs
1
TMP119AIYBGR
U1
1
BMP388
U2
1
SGP40-D-R4
U3
1
SHT4x
U4
1
CAT24C32WI-GT3
U5
1
Raspberry_Pi_4
J1
1
Conn_01x02_Pin
J2
1
LED
D1
1
TPD2E001DZDR
D2
5
100nF
C1, C2, C3, C6, C8
2
1uF
C4, C5
1
4.7uF
C7
2
1k
R2, R3
2
3.9k
R4, R5
1
4.7
R6

Canary design files

The KiCad project lives in the michael-michelotti/canary repository on GitHub; these links point at the commit this page was built from.

Canary: common questions

What microcontroller does the Canary use?

The Canary is built around the Raspberry_Pi_4, from the Raspberry Pi family.

How big is the Canary PCB?

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

How many components are on the Canary?

22 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the Canary design files?

From the michael-michelotti/canary repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Canary design in my own project?

The repository has no license, so all rights stay with michael-michelotti. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Canary 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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