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  • cwalger commented on sriksh9's instructable Quick Start to STM Nucleo on Arduino IDE4 months ago
    Quick Start to STM Nucleo on Arduino IDE

    Thanks for this, awesome!

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  • Monitoring Residential Water Usage by Reading Municipal Water Meter With Hall Effect Sensor + Arduino

    Mine has a rotating peice as well, and I considered trying to sense that. But I don't have any experience with it. Have you tried it? How'd it work out?

    Sorry for slow reply. You don't need an amplifier. You only need a micro and the compass module.

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  • cwalger followed Gregory011 months ago
      • 500W Halogen Work Light to 100W LED Work Light DIY Conversion (9000 Lumens)
      • Fixing Westinghouse LVM-37w1 LCD TV No Turn on & Shut Off Problem
      • Removing Infrared (IR) Filter From Microsoft Lifecam Studio
  • Monitoring Residential Water Usage by Reading Municipal Water Meter With Hall Effect Sensor + Arduino

    Thanks for posting! This inspired me to do the same but I tried gregory0's and rgsparber's circuits will poor results. I then bought a HMC5983 compass module (~$3) and it is much better. I only got a couple mV output signal with a hall, but the compass module interfaces with I2C and reads back values that vary 80 from max to min, so it's easy to find edges, and alignment/placement hardly matter. It also makes it easy to grab both rising and falling edges, as gregory0 mentioned, to double resolution. My meter only has 22 rising edges per gallon, so the double resolution is nice. Both hall circuits are AC coupled, so they can miss very low flow rates, and errors can accumulate with many flow starts/stops, but with the compass you always know where the magnet is so you don't get those inac...

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    Thanks for posting! This inspired me to do the same but I tried gregory0's and rgsparber's circuits will poor results. I then bought a HMC5983 compass module (~$3) and it is much better. I only got a couple mV output signal with a hall, but the compass module interfaces with I2C and reads back values that vary 80 from max to min, so it's easy to find edges, and alignment/placement hardly matter. It also makes it easy to grab both rising and falling edges, as gregory0 mentioned, to double resolution. My meter only has 22 rising edges per gallon, so the double resolution is nice. Both hall circuits are AC coupled, so they can miss very low flow rates, and errors can accumulate with many flow starts/stops, but with the compass you always know where the magnet is so you don't get those inaccuracies. No other components are needed other than the arduino (i'm using an esp8266 actually). Thanks again!

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  • Sonicare FlexCare - Tighten metal shaft

    Thanks for the writeup. you don't need to bend the coil away to get at the screw behind the coil. You simply need to pull the top and bottom half of the brushed apart. The black plastic has two plastic tabs that slide into the metal - if you pull the top and bottom of the brush away from each other, the tabs 'click' down an eight of an inch or so and the two halves come apart (held together on ly by the two coil wires). The it's easy to get at the back screw.

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