Hi

Pls check http://www.freewebs.com/maheshwankhede/

For Atmel/Intel 8051 microcontroller basic tutorials

Tutorial include Interfacing examples of different circuits to 8051
like I/O Ports LED, Switch, Relay, RS232C Cell Phones, GPS receiver,
7-Seg. Display, LCD Display, ADC & DAC, Sensors, Stepper Motor, DTMF
Decoder, Keyboard, External Memory with relevant theory, schematics and
sample codes in Assembly language & C language

Mahesh

Great work Mahesh!
Seems you have put lot of effort in to this.
RN