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teostefan·WRO-2025-Future-Engineers-Canada·pcb/main/main.kicad_pcb

Main PCB layout, top view — open source AVR/Arduino board by teostefan

About the Main PCB

Main is an open source AVR/Arduino PCB design by teostefan, published on GitHub. It is a 2-layer board measuring 65 × 30 mm, with 28 components from 22 distinct parts.

Its main chip is the ATtiny85-20P, from the AVR/Arduino family. Other key parts include the DRV8847PWP and TCA9544A. By type, the board carries 11 connectors, 8 resistors, 6 capacitors and 3 ICs.

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

From the project

Main repository for the joint uOttawa-CarletonU team competing in the WRO Future Engineers 2025 competition.

The following repository contains the code and technical documentation regarding the robot created by the CarletonU-uOttawa joint team for the 2025 WRO Future Engineers competition.

- About our Team - Demo Video - Software Setup - Power and Sensor Management - Obstacle Management - Mobility Management

Oscar Barbieri is a student at the University of Ottawa and is studying software engineering, and Stefan Teodorescu is a student a Carleton University studying aerospace avionics. Last year, Oscar and Stefan participated in the WRO Future Innovators challenge and made it into the international…

Main, from the project README
From the project README

Main components on the Main

ATtiny85-20PDRV8847PWPTCA9544A

Main bill of materials (BOM)

28 components, 22 distinct parts.

QtyPartRefs
1
ATtiny85-20P
U1
1
DRV8847PWP
U2
1
TCA9544A
U3
1
GPIO
J1
1
5V IN
J2
1
Motor Voltage In
J3
1
Steering Motor
J4
1
Tachometer
J5
1
Motor
J6
1
Aux I2C 3
J7
1
Aux I2C 4
J8
1
Aux I2C 5
J9
1
Aux I2C 6
J10
1
Gyroscope I2C Bus
J11
3
10uF
C1, C2, C3
1
0.1uF
C4
1
0.1uF@300V
C5
1
100uF
C6
5
10K
R1, R2, R3, R6, R7
1
330mΩ Thru-Hole
R4
Show 2 more
QtyPartRefs
1
15Ω Thru-Hole
R5
1
10K
RN1

Main design files

The KiCad project lives in the teostefan/WRO-2025-Future-Engineers-Canada repository on GitHub; these links point at the commit this page was built from.

Main: common questions

What microcontroller does the Main use?

The Main is built around the ATtiny85-20P, from the AVR/Arduino family.

How big is the Main PCB?

The Main measures 65 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Main?

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

Where can I download the Main design files?

From the teostefan/WRO-2025-Future-Engineers-Canada repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Main design in my own project?

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

Can I test firmware for the Main 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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