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microcontroller pic 16f877a

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meenachi

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hi all,
i am designing line following robot using pic16f877a.
the problem i faced is with input-output ports.
the output from sensor is 5v which is given to port D of muc.but due to internal voltage drop this 5v input is not processed by muc.
one solution i got is using external resistor chip.
is it correct solution?or else we can change the ports?
which is best?please help me..
 

The input of the 16F877A should not be dropping the sensor voltage. Do you have the port D pins configured as inputs? It should work on any of the port pins.
Brian.
 

meenachi said:
hi all,
i am designing line following robot using pic16f877a.
the problem i faced is with input-output ports.
the output from sensor is 5v which is given to port D of muc.but due to internal voltage drop this 5v input is not processed by muc.
one solution i got is using external resistor chip.
is it correct solution?or else we can change the ports?
which is best?please help me..
Click to expand...

can you please upload your circuit diagramm for it..because m working on this project too ..thanks.
 

u can try using relay or a transistor for switching.
hope this works.
:D
 

meenachi said:
hi all,
one solution i got is using external resistor chip.
is it correct solution?or else we can change the ports?
which is best?please help me..
Click to expand...
If u connect the resisor chip is pull-up between port pins & 5v... Then, it should be correct..
from my own exprnce 877a ports (i/p or o/p) to be use as logic (0 or 1), Better connect a pull-up resisor form pin to 5v...
 

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