Stepper Motor Strife

[circuitfish]

Hi folks,

I've built a stepper motor circuit using an L293D chip which receives 4 inputs, A, B, C and D from three data latches. I'm measuring the voltage of A, B,C and D for each step of the motor and was wondering if the table below shows the correct pattern.

I'm using a 4.5v power supply and any help would be much appreciated.
Thanks,
**broken link removed**

 

[Ubergeek63]

Stepper motor - Wikipedia, the free encyclopedia gives the standard drive waveforms...

but you should really dump that piece of garbage from ST (L293) - you are losing half your voltage in it (see the data sheet spec - saturation voltage)

 

[AlainB]

Here is another tutorial:

Stepperworld Bipolar Tutorial

Alain

 

[circuitfish]

Thanks chaps