Flylogic Engineering now has an interesting blog up on chip hacking! If you liked the posts on my blog about chip hacking, you may very much enjoy the postings at Flylogic. They’ve actually got a very nice piece up on the PIC18F1320 which reveals new findings about a device that I have some prior familiarity with. I’m looking forward to reading part II of their series!
[…] Article Link […]
[…] – Flylogic Engineering’s Analytical Blog – [via Link. […]
Hi,
I came across your blog by accident. I realise that perhaps you may feel that my input is too minimal to be worth responding to, but I really could do with some help.
I have an 8 pin DIL chip which I believe to be a counter. It is mounted on a small card with pads for connection to spring contacts. My problem is that the identification has been sanded off.
Is there any way I can identify what it is? There isn’t even any dimple to show which pin is no. 1.
Following around from one corner in an anticlockwise direction on the opposite side to the board, I have pin 1 as 0 volts, pin 2 is supplied with 5 volts, pin 3 has 0 volts, and pin 4 is reading 4.83 volts.
The remaining 4 pins on the other side of the chip are all soldered together and are connected to pin 3. There is also an unmarked resistor across pins 3 and 4 and what appears to be a resistor marked ‘222’ across pins 1 and 4.
If this is indeed a counter chip, I would like to find out which pin needs to be connected high in order to reset the counter.
If anyone can help me I would be highly indebted.
I think I kow what this device is from – I have an identical board from a fluid dispenser for an automatic litter machine. It fits your description, but you have pin 1 on the opposite corner. (Mine has the marker for pin 1). Did you ever find out any more about how to reset it? Thanks!
Sorry about the long delay replying. I only just found this website again. Yes you are correct. this is from a cat litter machine. I became totally disillusioned with this machine. It kept sticking during some cycles or wouldn’t scoop all the poop out and then would wash and bake the stuff. The smell was terrible. In the end I gave up and consigned it to the garage. Maybe I’ll find another use for it one day? I haven’t taken it apart, but my guess is that there is probably a small PLC inside it. Maybe that could be reprogrammed? I thought that the chip method for making you purchase more of their washing solution was a cheek! Why shouldn’t we be able to refill it with anything we like? Anyway, that’s my 2 cents worth. Did you ever find anything else about the chip properties?
Chris.
I saw that Flylogic Engineering blog. It’s interesting