HardLabs

Yaafr

atoomnetmarc·yaafr·Kicad/Yet Another AVR Fusebit Rescuer.kicad_pcb

Yaafr PCB layout, top view — open source AVR/Arduino board by atoomnetmarc

About the Yaafr PCB

Yaafr is an open source AVR/Arduino PCB design by atoomnetmarc, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 233.7 × 81.3 mm, with 56 components from 25 distinct parts.

Its main chip is the ATmega328P-PU in socket, from the AVR/Arduino family. Other key parts include the L7805. By type, the board carries 27 resistors, 7 crystals, 6 connectors, 5 switches, 4 capacitors and 3 transistors.

It belongs with the usb & debug tools designs in this gallery.

From the project

This is Yet Another AVR Fusebit Rescuer. It is able to restore fuses in bricked AVR microcontrollers using high voltage programming.

This is Yaafr, Yet Another AVR Fusebit Rescuer. It is large because of all the ZIF-sockets and does not even feature any mounting holes. It also has two IDC headers for expanding to programming clips or other adapters to rescue non-dip AVR microcontrollers.

It is be able to restore wrongly fused or locked AVR microcontrollers that support high voltage parallel (HVPP) programming or high voltage serial programming (HVSP).

Yaafr, from the project README
From the project README

Main components on the Yaafr

L7805ATmega328P-PU in socket

Yaafr bill of materials (BOM)

56 components, 25 distinct parts.

QtyPartRefs
1
L7805
U1
1
ATmega328P-PU in socket
U2
2
BC557
Q1, Q3
1
BC547
Q2
2
ZIF socket 40-pin, 240-3345
X1, X2
1
ZIF socket 28-pin, 228-3341
X3
2
ZIF socket 20-pin, 220-3345
X4, X5
2
ZIF socket 14-pin, 214-3341
X6, X7
1
Barrel_Jack_Switch
J1
1
Conn_01x20_Female
J2
1
Conn_01x03_Male
J3
1
Conn_02x10_Odd_Even
J4
1
Conn_02x06_Odd_Even
J5
1
AVR-ISP-6
J6
1
SW_Push
SW1
4
MSS22D18 DIP slide switch
SW2, SW3, SW4, SW5
1
1N5819
D1
1
LED
D2
1
100uF 16V
C1
1
33uF 16V
C2
Show 5 more
QtyPartRefs
2
100nF
C3, C4
2
10K
R1, R27
22
1K
R2, R4, R6, R7, R8, R9, R10, R11 +14
2
100R
R3, R25
1
470R
R5

Yaafr design files

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

Yaafr: common questions

What microcontroller does the Yaafr use?

The Yaafr is built around the ATmega328P-PU in socket, from the AVR/Arduino family.

How big is the Yaafr PCB?

The Yaafr measures 233.7 × 81.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Yaafr?

56 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Yaafr design files?

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

Can I use the Yaafr design in my own project?

Yes, under the terms of its Apache-2.0 license, which atoomnetmarc chose for the repository.

Can I test firmware for the Yaafr 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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