Tag Archives: Electronics

PS/2 keyboard filter (interceptor) on Microchip PIC

In the project of “internet vending machine” we used almost standard qwerty keyboard and standard PC, so we needed to have possibility to be able to switch off keyboard during reboot, to disable CTRL+ALT+DEL and so on. These functions with a decent quality, until the death of the project, had been performing by “the keyboard interceptor” device. Interceptor is a device that is connected between PC and keyboard for keyboard data filtering. Device also capable to receive from external sensors and transmit to PC via serial port some data, to control some peripheral devices , but it’s main task, which consumes the most of it’s resources, is keyboard data filtering.

Presence detector on Microchip PIC and TSOP1833

Some years ago I participated in a startup that was aimed to create some sort of vending machine. Those machines had to sell internet access for people in places like airports, railroad stations and malls. At that time (2005-2006) smartphones had just started to become popular and access to the Internet wasn’t so easy as […]

8×16 Microchip PIC LED message board. Preface.

My fun with LED message boards started in the very end of 2004 and ended in August 2005. By the August 2005 I had created some simple LED message boards (8×64 and 8×128), which are usually called here “the running string”, and had placed myself to stalemate. For my boards I used Assembler language and […]

Hard way to electronics.

This is a preface to the next few posts about simple LED message boards. Since I was a child I was interested in electronics. But it was just a feeling, impression. There were no any actual deeds until, probably, my 15th birthday. Why hadn’t I done anything to get closer to my field of interest […]