Cytron Technical Forum

Posted: **Thu Oct 31, 2013 2:46 pm**

Hello.

I'm currently building a RC robot using PT2262 and PT2272-M4. I'm having trouble with controlling the DC motor using L293D. The motor keeps turning on and off while I connect the input pins on L293D to PT2272-M4 data pins. The supply voltage for L293D is 9V and I'm using 5V for the enable pins on L293D. I followed everything as stated in the schematics. Can anyone tell me what's the problem causing it?

The schematic:

p/s: I've changed the HT648 into PT2272-M4

Posted: **Thu Oct 31, 2013 4:49 pm**

My advise is to replace the L293D with LED first. If the LED is working, then only replace with L293D.

Also check the voltage from 9V battery, it drain-out easily, without stable voltage, you get unstable system.

Posted: **Thu Oct 31, 2013 6:16 pm**

the led works, but when I changed the led into L293D, the current becomes unstable. I tried replacing the 9V battery with a new one, same problem still occurs. Speaking of battery, is 9V battery suitable for this kind of circuit? or do I have to get a LiPo battery or lead acid battery?

Posted: **Thu Oct 31, 2013 7:49 pm**

During development, I always use adapter. Normal 9V battery cannot discharge fast enough and the voltage drop easily.

Posted: **Thu Oct 31, 2013 8:43 pm**

Ok. Will do some modifications and see how does it turns out.

Posted: **Sat Nov 23, 2013 5:50 pm**

The problem is solved. I've changed into a smaller drive motor. It seems like I was using the wrong motor, causing the circuit fail driving the motor effieciently during the test run. Now, I'm using 2 3V DC motor and everything turns out to be perfectly fine. Besides, the power source is a 9.6V 3000mAh NiCd battery.

Cytron Technical Forum

Need help with L293D!!!

Need help with L293D!!!

Re: Need help with L293D!!!

Re: Need help with L293D!!!

Re: Need help with L293D!!!

Re: Need help with L293D!!!

Re: Need help with L293D!!!