ATtiny85 Fuse Restorer and Memory Erase Tool

[Chris Smith]

Hi all 

Chris G0JTN here

Over New Year and the past few weeks I have been playing with a smart little CTCSS board designed by Andrew ZL2PD. The board is 1"x1" and has only a hand full of resistors and caps plus the programmed ATtiny85.

I have now used them in a couple of PMR radios I've been working/ wasting my time on to give then CTCSS.

 

I have had to learn about physically programming the ATMEL ATtiny85. Using things like AVRDUDESS and lots of adaptors, programmer and cables, HEX and all the rest of the stressful bits..FUN?

However, if you have played with these little microcontrollers, and have probably bricked some along the way like me by setting the wrong fuse bits, then read on..

Andrew, has also designed a really good ATtiny85 Fuse Restorer and Memory Erase Tool to recover the "bricked" ATtiny85. 

It is easy to build (takes about an evening) uses a small amount of standard discrete components and uses a 5v USB power supply from a PC or separate 5v USB wall socket supply.

Just connect the PCB to a USB 5V supply, plug in the ATtiny85 to the PCB socket and press the button. The green light will come on and the chip is reset back to factory settings.

It does not use any PC or other Arduino to do the job and is stand alone.

Checkout Andrews website:

https://zl2pd.com/CEFR_Fuse_Reset_Tool.html

I have a few spare boards if anyone is in need of the CTCSS PCB or the Reset tool PCB (you will know if you need one)!!! Just see me at the club sometime.

All the best Chris

Chris Smith  MIET (G0JTN)

35 Allendale Road

Earley

Reading

RG6 7PD

Mobile 07809707056

email: christophe...@gmail.com