HardLabs

Plant buddy

HeyPCB·plant-buddy·kicad/plant_buddy.kicad_pcb

Plant buddy PCB layout, top view — open source AVR/Arduino board by HeyPCB

About the Plant buddy PCB

Plant buddy is an open source AVR/Arduino PCB design by HeyPCB, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 40.3 × 127.9 mm, with 13 components from 10 distinct parts.

Its main chip is the ATTINY412-SSNR, from the AVR/Arduino family. By type, the board carries 5 resistors, 3 diodes, 2 capacitors, 1 IC, 1 battery holder and 1 switch.

From the project

Sprout, the plant buddy: A circuit-board sprout that cries a little blue tear when your plant is thirsty. KiCad 10, heypcb.ai merch.

A circuit-board sprout that cries a little blue tear when your plant is thirsty.

Sprout is a capacitive soil-moisture stake that lives in a plant pot on one CR2032. Its stem carries a mask-covered electrode; an ATtiny412 times how long that electrode takes to charge through 1 MΩ, and wet soil takes several times longer than dry. When the soil dries out, a blue LED tear drips under its left eye; when the plant is fine it winks. Boop the bud between its gold leaves for an instant answer.

Plant buddy, from the project README
From the project README

Main components on the Plant buddy

ATTINY412-SSNR

Plant buddy bill of materials (BOM)

13 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY412-SSNR
ATtiny412
U1
1
3034TR
CR2032
BT1
1
TS-1187A-B-A-B
TS-1187A
SW1
2
KT-0603G
Green
D1, D2
1
NCD0603B1
Blue
D3
1
CL21A106KAYNNNE
10uF
C1
1
CC0603KRX7R9BB104
100nF
C2
1
0603WAF1004T5E
1M
R1
1
0603WAF1001T5E
1k
R2
3
0603WAF1000T5E
100
R3, R4, R5

Plant buddy design files

The KiCad project lives in the HeyPCB/plant-buddy repository on GitHub; these links point at the commit this page was built from.

Plant buddy: common questions

What microcontroller does the Plant buddy use?

The Plant buddy is built around the ATTINY412-SSNR, from the AVR/Arduino family.

How big is the Plant buddy PCB?

The Plant buddy measures 40.3 × 127.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Plant buddy?

13 components, from 10 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 Plant buddy design files?

From the HeyPCB/plant-buddy 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 Plant buddy design in my own project?

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

Can I test firmware for the Plant buddy 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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