Let's Make Robots!

any schematic design for brainless/no PIC/no microcontroller. avoiding obstacle robot??

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The motors should be running at the same speed. I've edited my reply above.

hmm.. should i use 2n2222 and 2n2907..?? 


ill buy a DC motor maybe tommorow. 6v DC motor right?? 

Yes, try those transistors.

And look for a lower current motor, similar to the pololu one I linked to above. Stall current of around 800mA, etc.

Good luck!

hey can i series two IR led right?? and minimize the R1 to adjust the range. up to?
Yes, that would be ok. R1 at around 150 ohms or so for an IR LED current of around 25mA.
haha. sumthing went wrong while im testing it again.. sumthing smoked.. but i think it's shorted.. may be i connect some wires.. hah.. this weekend im gonna buy new components and ill directly put it in PCB.. maybe ill use presensythised PCB.. wish me luck.. thanks for your help joC.. you help us a lot..
No worries, aidzmana. I hope it all works out.

i would like to try dis dy9wUCxwzK19.gif

i will just put this h-bridge in relay hbridge.gif

hmm. but i want to reproduce it twice.. should i use dual timer? or just simply reproduce the RECEIVER and relay? 

Just use one 555 and duplicate the receiver circuit.

'ullo, you're back!  Couple of points:

The h-bridge is not a drop-in replacement for the relay.

Regarding the h-bridge you've shown, you won't be able to drive the upper NPN transistors into saturation unless the h-bridge voltage is a couple of volts lower than the control voltage.

Saturation in h-bridge transistors is A Good Thing.

If you are still going to use a single supply for both control and motors, I can suggest other h-bridge configurations you can use. Also if you want to drive the motors from a higher voltage than the control voltage.

If you keep the 74HC14, you can use a couple of its inverters to drive the h-bridge, and use another inverter to make your oscillator, obviating (that's a good word, isn't it!) the need for the 555 chip.

P.S. Did you end up swapping out those high current motors?