[xixiaobo]

Hi, I purchased the a SB_1 Simple H-Bridge to drive a brushed DC motor and it is connected as follows:

H1 = 5V
L2 = pwm

H2 = Ground
L1 = Ground

5v = 5v
GND = Ground

S1 and S2 are not connected to anything,


On the other side, MV = 12 V and GND = Ground,

M+ and M- are not connected to anything,

No matter how I change the pwm, the potential between M+ and M- is always 12 V.

Did I do anything wrong?

Mechatronics Engineer

[Lon]

xixiaobo,

Try connecting a load to the M+, M- pins to see if the voltage changes. Something like a 1K ohm resistor should work. Without a connection between these two points there is no connection between M+ and M- to ground when the PWM signal turns the H-bridge on.

Lon