AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Diy Eeprom Programmer4/20/2021
Since the Arduino doesnt have enough pins to directly control all of the address, data, and control lines of the EEPROM, two 74HC595 shift registers are used for the 11 address lines (15 for the 28C256) and the output enable control line.
Diy Eeprom Programmer Code Is DuplicatedA lot of the code is duplicated since each sketch built on the previous ones.But Ive kept them separate to make it easier to find the exact code that goes with a particular video.This is a good place to start if youre looking for the fastest way to make sense of this repo. Youll probably want to watch the whole 8-bit computer playlist (see below) for this to really make sense, but the specific videos describing the code here are. Diy Eeprom Programmer Full Series OfAgain, youll likely want more context from the full series of videos, but heres the video describing the code. Theres a much larger series of videos about this project on YouTube as well. In all likelihood, if this repo interests you, you want to binge that whole playlist. This is why you should use a hot air station so it heats all the pads evenly and you can just pick the chip off the board instead of prying it. YouTube Video: DIY Honda Odometer Reprogramming Disclaimer: 1. ![]() Use care and caution when dealing with delicate components, and practice first on a spare cluster. Add Tip Ask Question Comment Download Step 1: Introduction Lets say you swapped an instrument cluster from a coupe to a sedan to change the look or color of the needles, or youre replacing a defective cluster. The mileage on most (Japanese) cars is stored on the instrument cluster itself, and not in the ECU. Therefore the mileage of the original vehicle that the cluster was from will be displayed on the dash. Odometer information is stored on a small EEPROM chip on the circuit board. The chip can be read and written to using a serial programmer. The odometer information can be copied over from the old cluster to the new cluster using Honda HDS, assuming the original cluster is operable. What follows is a hack-around to using HDS, by programming the mileage directly to the chip. You can also opt to merely swap the chips, or copy and paste the program, rather than decode. Add Tip Ask Question Comment Download Step 2: Disassemble the Instrument Cluster Once the cluster is out of the vehicle, pull up on a few tabs to remove the front plastic cover and fascia. Take a photo of their home position before taking this apart so you know where to realign it upon reassembly. Use gloves and dont touch the black face of the gauges, its a fingerprint magnet. ![]() Add Tip Ask Question Comment Download Step 3: Solder Hookup Wires According to the datasheet, pins 1, 2, 3, 4, 5 and 8 will need to be connected for programming. To read the information off the chip, while its still in the cluster, we need to solder some hookup wires to the leads. If you use a multimeter you can trace the leads to the pads on the other side of the circuit board, and then solder some hookup wire. ![]() Add Tip Ask Question Comment Download Step 4: Programming Hardware Setup This is the EEPROM programmer I built to connect the chip to my desktop computer. All it is are three 5V zener diodes (1) and three 4.7K ohm resistors (1). Using the PonyProg software, I was able to read and save the information from the odometer chip. The EEPROM must be removed from the board if you want to write to it, as it cant be programmed in circuit. So off we went trying to desolder an SMD chip And SNAP The leads broke off the chip.
0 Comments
Read More
Leave a Reply. |