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    building a noise activated sensor to record the noise and duration the noise is made

    Sounds like problem with the neighbours..?? WE used to use an off the shelf tape recorder. These days equivalent would be some sort of dvd recorder with a mike I'd imagine. Another approach is record or download a wav file of a barking dog and place on an SD card. Loop playback the wav with an...
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    Relay question

    You may have to rethink your logic here. As Hop says, how can you toggle a device on or off but at the same time have a 5 second delay? With a uC would be possible to engage short or long press with differing outcome so perhaps some study in front of you.
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    Next Smoke Detector Millionaire or Not?

    The way things are currently in Aus is dependant on many factors. Things will change over the next few years as new laws come into being. (2027 I think it is) Hard wired in rental currently is for accessible locations. When inaccessible to the building wiring, battery are acceptable. Currently...
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    Challenge - See if you can solve this simple circuit diagram

    Trash the 2 element LED bulb and replace with 2 single element, perhaps add some load resistance to make the flasher work on LDE loading or replace with flasher designed to work with LEDs. No way of knowing the internal circuit of the LED combination without hacking into one and I'm not about to...
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    Challenge - See if you can solve this simple circuit diagram

    To begin with, you do not show any detail or link to the LED units currently used or the flasher units.
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    Challenge - See if you can solve this simple circuit diagram

    If you were to draw the circuit diagram in a conventional way you would immediately see the problem associated with the dual LED in each instance. It is this precise reason why, voltage fed auto lights in particular are switched in the negative AND in a particular sequence/arrangement. Without...
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    Camera leveller

    There was a hack many moons ago for rc servos to change from the standard feedback pot to optical encoder. Why I'm not sure, I just vaguely remember it. Perhaps a tighter deadband.? See what I can find but again, why bother for a simple device as described here. The servo itself is hardly going...
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    Sharp microwave oven does not start

    Good one. I imagine you did some basic leakage tests afterwards also..?? Glow in the dark family members not included as such.
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    Water level meter

    Piezo will be ok. As for the rest, the link shows a few different types of sensor. Some are 5 to 12v and others 5 to 24v so depends which unit you have as to use in your vehicle. Most 12v cars will go at least to 13.8v on charge so it depends on the unit as to whether or not it will survive. If...
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    Regulating voltage made it worse???

    Zener regulator is not for that type of arrangement. Use a converter. https://www.ebay.com.au/itm/DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-1-23V-30V/400749241579?hash=item5d4e8424eb:g:r8AAAOSwIUZbYVEq
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    Sharp microwave oven does not start

    I am and my advice to you is not to play with it. Take to an authorised repairer or simply buy a new one.
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    Water level meter

    Just be aware that output has a maximum handling current of 200mA and whatever you intend to drive with the sensor may draw more current than that. In which case a relay or similar would be required.
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    Sharp microwave oven does not start

    Microwave ovens are not the sort of device for amateurs to be playing with. Not only the high voltages but also the risks from the micro waves should you happen to accidentally get something to work with the case open. Cost of replacement magnetron alone would be over Aus$70.00 so in most...
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    Question concerning Arduino and C++

    Good work on the pcb's. A little bit of undercut but not bad all the same. I tend to use a protective spray after the board is completed. If it looks like it will be more than a couple of hours exposed, I spray it and the product below allows one to "solder through" later...
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    Please can you help identify this LED hula hoop switch

    I was chasing a similar mounting tactile switch a few months back but no luck there either.
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    Varistor TVR 10241 blown

    Although a good scan is a starter to fault finding, it is a good move to meter out certain items as 73'sde Edd outlined. Electronic faults are more often than not, not visible by eye. More than likely it would have taken out the main switcher or ic associated with it.
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    Question concerning Arduino and C++

    Yes, I understand exactly where you are coming from. Most of my applications, although variable in nature, usually are a combination of many different operations. Most are covered quite well by the Arduino pro mini. I tend to learn as I go, so to speak, where I don't bother too much with a wide...
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    Question concerning Arduino and C++

    Go to the Arduino page, download and install the IDE, run down the list of example sketches and you'll soon see. From the above I think you are trying to jump in at the deep end. Start simpler...... Best to get a couple of boards etc. to play with as you'll pick it up more quickly. Using clone...
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    Water level meter

    It's an npn output and one can use it whichever way around one desires. AS the instructions in the link you provide near the circuit diagram explains. If you connect a relay, for example, to this output with change over contacts , you can drive whatever.
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    Question concerning Arduino and C++

    You do realise it is not necessary to know C or C++ to program Arduino. There is a much bore basic approach and for the most part will get you to the same end in a much easier shorter time.
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