So I am trying to use Arduino to control my motor.
I connect the pin 12, pin 13 on my arduino to the 1A and 1,2EN on SN754410 (Here is datasheet http://www.sparkfun.com/datasheets/IC/SN754410.pdf
I didn't connect 2A,2Y,3A,3Y,4A,4Y,3,4EN,VCC2,GND3,GND4
After setting 1A and 1,2EN to be high, what I can observe is:
VCC1: 12V 1A, 1,2EN : 3 ~ 6V (Keep changing,Never lower than that value) 1Y (output volate to motor): 0.66 V, should be same as Vcc! Wrong
GND1,2 = 0, All other pins have a little voltage like 1V or 2V....
Why the output voltage is so low.... what should I do? Should I just connect all pins? Or should I add some kinds of capacitor / resistor circuit?