After you have chosen which Logic IC to test, it connects the Supply to the corresponding pin, pin 14,pin 16 or pin 20. After that, it checks the overcurrent pin. If there is an overcurrent, it disconnects the power. This what the logic IC tester do before testing an IC. The microcontroller pins are all high or in input state so it will not pull down the pin of the Logic IC when connecting the power of the device under test. This prevents damage to the logic IC in case you entered the wrong part number.
This project is made from scratch and I did not copy or download from the Internet. I wish to post it for Free in elabs to earn pogi points but I need the money to buy some things like a harddisk or a solar panel.
Usually, I earn USD$500 for such a project but the publisher said this project is not interesting to their readers. That is why I am selling it.
Source code language: 8051 Assembly language
Source code file size: 148 Kbytes
Assember: Metalink Cross Assembler
Processor: Any 8051 microcontroller with Flash memory with at least 13KB like DS87C520 or AT89C55, DS89C430
Crystal: 8 Mhz
Size of Intel Hex file: 28 KBytes
Size of BIN object code: 12Kbytes
You can see from the size of the source code that this project is not made in just one afternoon or one day. I spent many days coding it and testing it to earn the USD$500 from Circuit Cellar. However, it was not published.
Circuit Cellar is a great magazine. It is a magazine for engineers by engineers. It has good content superior to other magazines which targets just the plain hobbyist. You can subscribe to it or submit articles like I do. This is my source of income after quitting my day job. You can visit their website at www.circuitcellar.com
for contests and COOL freebies. This is where I get COOL,FREE hardware not just ICs.