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Member Since: July 18, 2013

Country: United States

  • This is definitely a useful product, but your choice of op amp is a bad one. The LM358 can only drive the “HIGH” level to about 3.5 or 3.6 Volts, which I believe is barely hovering around the threshold for the Arduino HIGH level. You might instead replace the LM358 with a rail-to-rail op amp like the MC33202, which is also available in the SOIC package. This could avoid some potential snafus when the logic is not working as it should…

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