Is it possible to use an Hall effect sensor with PWM?

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i have acs712 sparkfun. after calibrating,  mode filtering used , current readings (usually 30ma difference measured on voltage regulator) when varying voltage @ voltage regulator. however, in application need control high current load, hence using configuration utilizing pwm , transistor (as described here). fritzing image below depicts current configuration (the led on circuit nickel-titanium wire heated via joule effect) , arduino code available @ github.




the problem have when utilizing pwm, current accurately measured when pwm's output 0v or 5v. value in between, result either quite unstable or not precise. previous forum post, seems not possible use hall effect current sensor measuring current when utilizing pwm. can more experience confirm this? if true, guys recommend changing in circuit accurate results? (my maximum current 2 a)

you need synchronize reading when pwm high, multiply the
duty cycle - can problematic low duty cycles on-period may short the
hall sensor settle (usually few microseconds).

what mean fritzing software doesn't have symbol nickel superalloy heating wire? ;)


Arduino Forum > Using Arduino > Sensors > Is it possible to use an Hall effect sensor with PWM?


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