16f877a with SN754410

[Metabolic_7]

sn754410

currently i'm useing the PIC16f877a with the sn754410,
but have a problem with it trying to use push butten to activate it
but have problem with the code do anybody have a code for it

 

[mvs sarma]

sn754410 circuit

you may have to implement contact de-bouncing logic in software. you may have to read the switch few times ( say 8 ) , if the switch is ON after those testing attempts, (amounts delay like few mill sec.) then only it is accepted as a true switch on condition. likewise OFF also.

 

[blueroomelectronics]

The SN754410 is a quad half bridge, what does a push button have to do with it? Schematic might help.

 

[Metabolic_7]

i put 8 push butten at portD for 8 speed so each butten will actived
at each speed and a stop butten at portA

 

[zawmintun1]

Where Sources

 

[Metabolic_7]

dc

 

[blueroomelectronics]

Your jpg is tough to read, and your design won't work.
Lots of errors, no decoupling caps, no current limiting resistor for the LED, your H-Bridge will only run the motor in one direction, your switches have no pulldowns.

 

[Metabolic_7]

this was the 1 circuit have put caps, current limiting resistor for the LED, pulldowns for the switch,but i want the H-Bridge to go only one direction, just need help on the H-bridge circuit