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  • c.r.h. commented on thediylife's instructable Simple Arduino Home Energy Meter3 weeks ago
    Simple Arduino Home Energy Meter

    Hum...If using min and max values, how about instead of subtracting 516 counts as an offset, consider:RMScurrent = (maxCurrent - minCurrent)/2.0 *0.707 / (your constant)

    Since the output of the current transformer is AC, doesn't the output (after the shunt resistor) need to be rectified and smoothed. No need to bias such a circuit so long as the common of the rectified signal is common the the Arduino's analog ground. Hardware signal scaling would be accomplished via the shunt resistor value.

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  • DIY 300 to 75 Ohm TV Antenna Coaxial Baluns

    Was Googling around for baluns and found your Instructable. You may want to double check the transformer schematic. On the 300 ohm side where the two windings #2 & #3 connect, I think that net should float, not connect back to the 75 ohm ground. As it is shown currently, winding #2 is shorted.

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  • c.r.h. commented on othermachine's instructable The Nerd Watch11 months ago
    The Nerd Watch

    Neat Project. For the watch strap... There are some one piece nylon watch straps out there. I found a few on Amazon but they are 18-22mm wide typically. Could modify PCB for a std. one piece strap for a highly finished look. Just need to weave the strap through the two slots in the PCB.

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