Robo India presents the working and concept of electro mechanical switch Relay. It also explains how to use it with AVR family's microcontroller Atmel Atmega 16.

1. Robo India
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2. • Atmega16 have total of 40 pins
32 I/O pins..
PORT “A” = 8 Pins
PORT “B” = 8 Pins
PORT “C” = 8 Pins
PORT “D” = 8 Pins

3. Port “X”
DDRX PORTX PINX
NOTE:- X is the name of port and it can
be A, B, C or D .

4. • DDRX – For setting the direction i.e. Input
or output.
• PORTX – For setting output value of port.
• PINX – For reading data available in port.
NOTE:- X is the name of port and it can be A,
B, C or D .
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5. DDRX= 0xFF; (O/P-Port)
DDRX= 0x00; (I/P-Port)
or
DDRX = 0b 1 1 1 1 1 1 1 1 ; (O/P-Port)
DDRX = 0b 0 0 0 0 0 0 0 0 ; (I/P-Port)
NOTE:- X is the name of port and it can
be A, B, C or D .
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6. 1.If
if ( conditions )
{ code to be executed }
2.For loop
for(start ; condition ; step)
{code to be executed}
3.While loop
while( Condition)
{ code to be executed }
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9. Qn. What is RELAY ?
ANS. RELAY is a electromechanical switch
which use ELECTROMAGNET for switching
operations.
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10. • #include <avr/io.h>
• #include <util/delay.h>
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Email- info@roboindia.com
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