HardLabs

DIY Cyclecomputer

jucordero·DIY_Cyclecomputer·Electronics/CiclocomputadorMKII.kicad_pcb

DIY Cyclecomputer PCB layout, top view — open source AVR/Arduino board by jucordero

About the DIY Cyclecomputer PCB

DIY Cyclecomputer is an open source AVR/Arduino PCB design by jucordero, published on GitHub. It is a 2-layer board measuring 87.6 × 50.8 mm, with 18 components from 11 distinct parts.

Its main chip is the ATtiny85V-10PU, from the AVR/Arduino family. Other key parts include the L80 and FeatherM0Adalogger. By type, the board carries 4 resistors, 3 ICs, 3 switches, 3 capacitors, 2 transistors and 2 connectors.

It belongs with the rf & radio and displays & leds designs in this gallery.

From the project

Create your own custom cyclecomputer / GPS tracker

The microcontroller board used is the Adafruit Feather Adalogger M0: https://learn.adafruit.com/adafruit-feather-m0-adalogger/overview

While not the cheapest option, it provides both the form the factor and ease of integration to the project in terms of not having to bootload a custom microcontroller chip. Also, having the SD card reader on board facilitates things a lot. Of course there are plans to move to a completely integrated design, with a fully custom board including the SAM21G18 to drive the display and perfipherals.

DIY Cyclecomputer, from the project README
From the project README

Main components on the DIY Cyclecomputer

L80FeatherM0AdaloggerATtiny85V-10PU

DIY Cyclecomputer bill of materials (BOM)

18 components, 11 distinct parts.

QtyPartRefs
1
L80
U1
1
FeatherM0Adalogger
U2
1
ATtiny85V-10PU
U3
2
Q_NPN_BEC
Q1, Q2
1
Conn_01x23
J1
1
Conn_01x02_Male
J2
1
Battery_Cell
BT1
2
SW_Push_Dual
SW1, SW2
1
SW_Push
SW3
3
C
C1, C2, C3
4
R
R1, R2, R3, R4

DIY Cyclecomputer design files

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

DIY Cyclecomputer: common questions

What microcontroller does the DIY Cyclecomputer use?

The DIY Cyclecomputer is built around the ATtiny85V-10PU, from the AVR/Arduino family.

How big is the DIY Cyclecomputer PCB?

The DIY Cyclecomputer measures 87.6 × 50.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the DIY Cyclecomputer?

18 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the DIY Cyclecomputer design files?

From the jucordero/DIY_Cyclecomputer repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the DIY Cyclecomputer design in my own project?

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

Can I test firmware for the DIY Cyclecomputer 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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