Hi
I want to measure the current, the below plot is of current values obtained from motor, which is controlled by PWM input of 50% duty cycle.
my current values are going back to 0 when the PWM cycle is in off state, how i can measure the current? what can i do for it?
They should be zero (0) when the PWM is off.
So I'm a little confused about what you are trying to measure.
What you probably want to do is measure the RMS current. Here is a circuit that will do it for you.
There is a lot posted on the WEB about RMS current, voltage, and what it is. Your best tool will be your search engine.
It seems you have already measured the current.
How else did you get a graph like that.
So how did you do that.
DC motor current can be measured with a shunt (resistor) in the ground line of the motor (driver). The PWM component should be filtered out (averaged) in hardware and/or software.
Leo..
I don't know your PWM frequency however this plot does not seem correct for a DC motor controlled by PWM. Even if your PWM allows the motor to stop (which would actually be start - stop, not PWM) this waveform looks wrong.
What is your goal? I would think a simple multimeter with a DC amps range would do the trick.
Hi, @newbiee22
Welcome to the forum.
Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Can you post some images of your project?
So we can see your component layout.
Thanks.. Tom.. 
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