line follower circuit

[Norlin]

They're NPN transistors and I'd assume that their emitter is connected to the negative terminal of your battery. It's not on the schematic, but it's probably assumed to be a given.


Edit: nevermind, it IS on the schematic

 

[Norlin]

Also, you don't need the resistor and two red LEDs, but if you do use them, make sure you pick a resistor to match your LED pair

 

[Norlin]

Ahh, the one end of the photoresistors is likely meant to be hooked up to the positive terminal of the battery?

 

[Transistorman]

the power is 6v (its up to your kind of your motor was ( mine is 12v so it can make the motor slower ))

 

[Dragon Tamer]

I've seen that sandwich robot design before, I even have the book. I find that it is better if you use an op-amp with a gain of 2 for the circuit because it is less likely to stop its motor suddenly and pass right over the line.

 

[goutam]

yeah, but how are they powered then?

Using relays

 

[Norlin]

Using relays

relays??? There aren't any relays in this particular circuit. The transistors here are sinking current and are "turned on" by the photoresistors.

 

[Transistorman]

will work fine

the circuit will work fine if the photoresistor keep detecting/touching the black line
**broken link removed**

 

[vantusaonho]

This is my circuit that i designed myself: (xps file)

http://www.mediafire.com/?0h6tsht4tlo2nzq

Sorry for i cant capture into MS Paint since it is too big with screen!
If you can not read it, i can re-post part to part!

 

[3arssharmat]

vantusaonho: can u please upload a link to ur schematics again thnx

 

[4pyros]

vantusaonho: can u please upload a link to ur schematics again thnx

vantusaonho has not posted for two years.
Start a new thread if you need help.