L293D Pin diagram and functions

L293D Pin diagram and functions. The pin out of L293D is as shown below.

This IC is basically a Motor driver. It consists of four inputs , four outputs , four grounds and two enables for each motors. We can drive two motors using single L293D chip.
The below is the Truth table or the function table of the L293D motor driver.

Pin 1	Pin 2	Pin 7	Function
High	Low	High	Turn clockwise
High	High	Low	Turn anti-clockwise
High	Low	Low	Stop
High	High	High	Stop
Low	Not applicable	Not applicable	Stop

Atmega 32 pin diagram

Atmega32 is a High performance , low power AVR  8 bit Microcontroller.

The pin diagram is as shown above. Atmega32 have 40 pins with four ports A,B,C and D. We can add crystals to increase the clock of the device. It is very important to learn about this Microcontroller, it can be used in many projects.

AT89S52 pin diagram

AT89s52 pin diagram is as shown below.

• Pins 1-8 are port 1
• Pin 9 is RST.
• Pins 10-17 are Port 3
• Pins 18 &19 - Crystal (XTAL)
• Pin 20 - GND
• Pins 21-28 are Port 2
• Pins 32- 39 are port 0
• Pin 29 - PSEN
• Pin 30 - ALE
• Pin 31 - VPP