Hi Gene, somehow I don't relay understand your problem, but... > Sparkfun put an op-amp on the chip output to make it more > sensitive, but for my purposes, it should have been a comparator.
You can easily rewire the existing circuit to be a comparator. See http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Current/ACS712%20Low%20Current%20Sensor%20Board%20v14.pdf and break the connection between the output and R1 and C1. Or to get a comparator with a adjustable hysteresis additional rewire R3 to get an adjustable resistor between the output and the positive input of the amplifier. The current the circuit draws highly depends on the impedance of the input you connect the output to. The OPA344 its self only draw 150 µA (max. 250) but can deliver up to 15 mA (max. 30 at high temperatures). The ACS713 draws 10 to 13 mA with open output. So you end up with 13 mA min. to 30 mA (in worst case around 45) depending on the load at the output. See you Flo ------------------------------------------------------------------------------ Master HTML5, CSS3, ASP.NET, MVC, AJAX, Knockout.js, Web API and much more. Get web development skills now with LearnDevNow - 350+ hours of step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122812 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
