http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008-12-02T00:47:47-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t9448.html 2008-12-02T00:47:47-08:00 Hi everyone!I am newbie here. What I need is create a project that can turn on and off light (220V) with microcontroler using PC. It is like small home automation but only for lights and electromotors. Can you explain me what do I need to do to do that, what microcontroller, how to make serial connection, how to make programmer (is serial connection same as programmer?) and how to make microcontroller turn on the light bulb (is it with relay?)..I know how to make software but I need details on hardware. Is at89c51 good for that? I really need simplest solution and I hope you can help me. http://www.8051projects.net/forum-t9448.html 2008-12-02T00:47:47-08:00 abbas1707 you can do it with pc's parallel port.but if you want large distance or less wires, serial can be the choice.pc-->microcontroller-->circuitry for deriving relays-->relaysyou can use 89c2051...but this choice depends on number of outputs you want to have http://www.8051projects.net/forum-t9448.html 2008-12-02T00:47:47-08:00 Rayman I want just few outputs (not more than 8) and serial connection would be fine. Where to find schematics for programmer and serial connection? http://www.8051projects.net/forum-t9448.html 2008-12-02T00:47:47-08:00 sashijoseph It's better to use an ISP chip which can be programmed easily(with minimal hw).No point wasting time building a programmer or wasting money buying one.Use AT89S51 with this programmer http://www.kmitl.ac.th/~kswichit%20/cheapcable/index.htmlor a Philips P89C51RDxx (bit costly) which only requires a serial cable for programming.As for the serial hw,we have it right here in the Tutorial section.http://www.8051projects.net/serial-communication/introduction.php