how to make car controller using photodiode? and body car using DC motor using relay

 

Are you asking how to make a line-following robot? Try searching on that term.

I can't understand your request.

 

sorry for not details.

so here, i want to make car control using DC motor with relay..so in my remote car controller i want to use photodiode only. so once i touch photodiode, i want it send signal to car control to move forward & reverse.

 

This language barrier may be too high to scale.

 

So you have a remotely controlled car. A toy?
Instead of using a joystick, you want to use your finger to block ambient light to a photodiode?

If this is close, I think you will need one photodiode for each direction. The photodiode has no directionality - it is either lit or not lit.

 

sorry for not details.

so here, i want to make car control using DC motor with relay..so in my remote car controller i want to use photodiode only. so once i touch photodiode, i want it send signal to car control to move forward & reverse.

Try drawing a picture of what you want and show us that. Which language do you speak natively?