We have a ham radio repeater club and 1 of the members is a silent key this past month. Here is the info we need, We have a repeater when keyed or activated it will give its call sign in morse code. It will stayed keyed until the morse code is finished. The member who was taking car of this passed away silent key. The interface he used small pc board with the Tiny AT85 chip. We need to get this file for future repeater upgrade. The members wife got rid of his equipment before we had a chance to where he might of kept the hex file he used to program the AT85 chip. We have some paper work on what he was doing but no actual file. Is there a way to read/extract the file from the at85 with blown fuses? we have blank chips and some info but no file to program the chips Any help thanks

[image] van_der_decken: First draft of the program is working. I think it would be a better option to OP than hacking the chip by china service :slight_smile:

I'm back and great news you might have to program finished. Had to do a field trip today with my son and his school in our town. So i do have a Nana and ordered the same power supply. Hope to get the programmer working and also waiting on the program you are writing. I,ll be here most of the night its 2:50pm here in Boston Ma.

I know a friend who used their services and had good results getting a 12F683 chip extracted. They need a chip to do this and say you will not get the chip back as they some how remove the top. So the Hex file is emailed to you, this of course after you pay them.

[image] dss67: I,ll be here most of the night its 2:50pm here in Boston Ma. Boston Ma. ? I was wondering about this from the OP and had thought that "silent key" was simply a Google translate effect for a "death" in a strange tongue: [image] dss67: We have a ham radio repeater club and 1 of the members is a silent key this past month.

Ham operators call a death of a member a silent key As here in the states to get your ham license you need to pass Morse code hence using a cw key. So the person was the brains of our club/repeater and you never think of someone passing until it happens.

Finally back in from a long day. Here's the sketch with the debounce code for PTT_IN included (which may or may not be needed but doesn't hurt) and the 3 blinks of the LED on startup as well. The forum wouldn't allow a raw hex file, so it's been zipped. repeater.ino.hex.zip (7.1 KB) Your fuse selection is 8MHz internal clock and reset disabled.

Agreed that it would seem unlikely that the originator of the software would have taken steps to protect the hex code. However, the following is not correct. [image] Delta_G: If the lock fuses aren't set then you just need a regular programmer to read it out. A regular ISP programmer needs a functioning reset pin on the ATtiny85. However, in this case, the reset pin has been configured as a gpio pin. This is evident from the schematic where the ATtiny (PB5) reset pin (1) is used to test the busy pin (16) of the DF player. This means that a high voltage programmer is required first and this has the effect of restoring the original function of the reset pin.

Thanks so much for your help with the file. I will try later today and see if it will work in the pc board we have. Its a Holiday here in states Thanksgiving so gotta help the wife get things ready for tomorrow. My best time to do all my work is at night after 7pm. So again thanks to all who have helped and especially [van_der_decken] for writing the file and im excited to see if it will work later today. Happy thanksgiving to all out there. It would be nice for all to maybe state where your from country/state. Thanks for now have to get my son to school be back later to report.

I remember the person said he would protect the chip from other people so they could not use on their repeaters. and also in their base/mobile radios. I do have a copy of a file he wrote its the one that will key after the person is through talking and the repeater will stay keyed until sound finished. I have that file in Hex and have used my programmer to program the chip. When I did a few chips I did try to read and got all fffffff on a working chip. Just never got around to getting the keyup file from him to have in case he was not around and for sure now he is a silent key. There are a few other clubs who have been using our setup on there repeater and they also want the keyup type. Again we have no backup so cant wait until tonight to try the file and program a chip. Some ham operators also installed the module in there radio with an on/off switch to Identify themselves their call sign so they dont have to. The pc board is about 1.5x1.5 inches so its small and can fit in most radios. thanks to all have a great Thanksgiving day tomorrow

Tiny at85 CHIP INFO NEEDED

Other Hardware Science and Measurement

dss67 November 22, 2023, 12:31am 41

Here is link Contact Us - Shenzhen SiChi Technology

I want to know that How I lock my firmware in atmega328

Topic		Replies	Views
Help getting attiny85 to work with DF player mini Programming	140	1584	September 23, 2026
Soundmaschine für ATtiny85 Deutsch	57	1651	February 3, 2024
DFPlayer Mini begin() always fails with "Busy" error, but works standalone via IO_1/GND short General Guidance	31	467	October 3, 2026
Dfplayer mini not working Audio	83	760	September 25, 2026
Rtttl with T88 Tiny Programming	39	766	June 13, 2026

Tiny at85 CHIP INFO NEEDED

Related topics