Hi
Pls check
formatting link
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