It would be useful to see the wiring schematic you used for this project. Perhaps you could add it to README.md?

Edit: Also, I'm confused. Does this let us also program cheap Ebay knock offs to look like "genuine" Dell chargers? Your README.md instructs the user to connect to it to the "OneWire bus", but it's not exactly clear what that means. Some clear schematics of the use cases -- both when programming the chip, and when putting it into circuit, would be useful.

Edit 2: also, would this work on an 'duino? Lots more people have 'duinos, instead of Tiny85s lying around. I'd like to try this project before my Tiny85s and dev boards arrive.

My current preferred setup for attiny programming consists of a board with an arduino programmed to function as a ISP, with a couple of additional components to prevent it from resetting to bootloader. The relevant wiring is essentially this. This is a very popular type of programmer I think, since a lot of people have and know where to get arduinos.

How would I use this project with my setup to program my attiny85?

Can I use this code and upload it into arduino? I have also same problem of the Dell charger.
and another question is that, if I use Digispark ATTINY85 then How Can I upload this complete code into Digispark ATTINY85?

I am using this Digispark attiny85 module and It can be programmed using Arduino IDE. Please help me that how can I program your code in this attiny85 module using Arduino IDE?

Hi, not sure the schematic in its current form would work:

TXD --------|<|----*-------- ID
                   |
RXD ----------------

GND ------------------------ GND

Seems TXD is at least missing a pullup on the anode (assuming the diode polarity is correct), since when you want to send, you would drive the pin low and open/close the diode:

                        VCC 
                        _|_
                       |  |
                       |__|
                        |
TXD --------|<|----*----*--- ID
                   |
RXD ----------------

GND ------------------------ GND

Hi
It looks like dell-charger-data-editor.py no longer works on ubuntu 20.04.

File "dell-charger-data-editor_backup.py", line 192
print('%02x ' % byte, end='', flush=True)
^
SyntaxError: invalid syntax

Would it be easy to fix it ?

So, eeprom-data.hex isn't a binary file. I was originally confused about this -- trying to open it in a hex editor and such, before I realized it was "meta-hex" -- ASCII values encoded in hexadecimal.

This seems confusing to edit, and none of my coding tools will actually interpret the hex data into ASCII in any panels, so I can see what it says easily. E.g., where the "DELL" tag is, etc.

Now, of course, I can do all this by hand, but it doesn't seem ideal. I'm weary of making a mistake, since I could theoretically fry a motherboard that way.

Is this ASCII-encoded *.hex file a standard format? If so, what tools can I use to edit it? (PLEASE let them be FOSS tools! 😝)

If not, would it be worth considering having this be a normal binary file instead of ASCII-encoded?