HardLabs

Odoconv

movatica·odoconv·circuit/odoconv_circuit.kicad_pcb

Odoconv PCB layout, top view — open source AVR/Arduino board by movatica

About the Odoconv PCB

Odoconv is an open source AVR/Arduino PCB design by movatica, published on GitHub. It is a 2-layer board measuring 51 × 27.9 mm, with 16 components from 12 distinct parts.

Its main chip is the ATtiny85-20PU, from the AVR/Arduino family. Other key parts include the LM2937xT and PC817. By type, the board carries 4 ICs, 4 resistors, 3 diodes, 3 capacitors and 2 connectors.

From the project

Using an ATtiny85 to extract a speedometer signal from alternating current.

odoconv ist ein Kunstwort aus odometer (engl. für Hodometer bzw. Wegmesser) und converter.

Die hier beschriebene elektronische Schaltung konvertiert die Wechselspannung eines Nabendynamos in ein Schaltsignal, mit dem normale Sigma-Fahrradtachos angesteuert werden können. Damit entfällt die Installation des Reedkontakts am Vorderrad.

Das macht zwar nichts wirklich einfacher, ich finde es so aber eleganter :blush:

Odoconv, from the project README
From the project README

Main components on the Odoconv

LM2937xTPC817ATtiny85-20PU

Odoconv bill of materials (BOM)

16 components, 12 distinct parts.

QtyPartRefs
1
LM2937xT
U1
2
PC817
U2, U4
1
ATtiny85-20PU
U3
2
Conn_01x02
J1, J3
1
B125C800DM
D1
1
1N4148
D2
1
1N4728A
D3
1
1uF
C1
1
100nF
C2
1
100uF
C3
2
10k
R1, R3
2
100
R2, R4

Odoconv design files

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

Odoconv: common questions

What microcontroller does the Odoconv use?

The Odoconv is built around the ATtiny85-20PU, from the AVR/Arduino family.

How big is the Odoconv PCB?

The Odoconv measures 51 × 27.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Odoconv?

16 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the Odoconv design files?

From the movatica/odoconv repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Odoconv design in my own project?

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

Can I test firmware for the Odoconv 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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