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    VFD (Variable Frequency Driver) for 3-phase motors.

    Good luck with power output and torque. The phrase "wouldn't pull the skin off a rice pudding" sort of comes to mind.
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    Li-Ion battery: Too much voltage?

    You could switch cells in and out of circuit to get roughly some speed control. Would depend on the extent of the current draw as to whether it would have adverse battery life as a whole. Don't understand why you need any further speed regulation though as you said you already have a pwm...
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    VFD (Variable Frequency Driver) for 3-phase motors.

    Watch and believe videos like this will just get you into more strife than Flash Gordon. All they are doing here is making a "crude" cap start/run motor. Nothing to do with VFD.
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    Help about fridge protector delay time

    Who says they don't have these. A quick look at any uC will show many have internal components. External devices are usually added for more accuracy. A quick look at the bottom of the first page for the 12c series will show internal osc. Pdf enclosed ..........
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    Proximity sensor for parking

    79 and busy as....... sound a lot like my place. I'm sure I used to have waaaay more time to do things before I retired. Then again the missus got wind of how much spare time I "have".
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    Stair Light/Motion Sensor

    Giveaway is the moon symbol. (Lux) This pot adjusts whether pir works in daytime as well as nightime. i.e. screw it around to the moon and it only works at night. Fairly rough adjustments though ( log rather than linear) so have to fiddle a bit. 220-240v ac ones are the same.
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    Li-Ion battery: Too much voltage?

    Lithium ion or LiFePo4 are nominal 3.3v per cell. Lipo's are nominal 3.7v.
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    Stair Light/Motion Sensor

    Try these...... https://www.ebay.com.au/itm/Automatic-DC-12V-LED-Light-IR-Infrared-PIR-Motion-Sensor-Switchs-Adjustable/163497737709?hash=item2611397ded:m:mFspvGQiKNiiPgY9ASQ_fcg:rk:2:pf:0 Or cheaper still ...
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    Proximity sensor for parking

    Seems you have no idea of how some car owners treasure their vehicles. Mine is a '78 Celica and I for one would shudder to think a piece of flexible plastic hose or whatever was scraping down the side of my vehicle's paintwork every time I parked in the garage. :eek::eek:
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    Proximity sensor for parking

    Yes, that was the idea. Edit:- I found one of many garage sensor projects. This one uses a 3 colour LED and the code is relatively simple. https://www.instructables.com/id/Ultrasonic-Parking-Sensor-With-Arduino/ You will need to download the Arduino program (IDE....integrated development...
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    Help about fridge protector delay time

    No.
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    Proximity sensor for parking

    Come on now, you're a Jag driver......:cool: The Arduino ones I referred to are sonic devices so they would normally operate at right angles to the vehicle. (Tx and Rx module) I am trying to imagine how you would set it up so I'm guessing on the door frame would cover any part of the vehicle...
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    Proximity sensor for parking

    You don't say how close...... Anyhow I would imagine the Arduino type sonic sensors would work just as well. Distance is distance whether side on or in front. I just hang a tennis ball from the ceiling.:):) Actually there is one I have seen that has a row of LEDs which light in sequence so...
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    Will 13v led lamps run on 12v?

    Something not right there. First photo shows the light with it's own internal driver ( input 220-240v 50 hz) Although I would not be happy with single insulation as supply lead for 220-240v. If it is indeed referring to the driver, then 1 driver per fitting. 13v 0.7A close enough to 9w...
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    Help about fridge protector delay time

    Just be careful with some of the links as I had 2 warnings come up with Avast. There is a video on one link but if you can understand it, you are better than I am. Sounds like the bloke did the video with his head in a bucket.
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    Help about fridge protector delay time

    Front label says "microcomputer design" so more than likely there is a microcontroller with the "timing" is built in to the program.
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    Do 32 input/1 input and gates exist?

    Doesn't make sense to me I'm afraid.
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    Do 32 input/1 input and gates exist?

    Think you will find 4 is usually a maximum for design reasons. Are you saying all 32 are hi or are some lo and some hi. You will probably need to run up a logic diagram to get the right structure. More detail on what you are trying to do would help also.
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    Deep Cycle battery and trolling motor question

    Many of the battery Ah ratings will deteriorate as the load current increases so it is not a simple matter to openly say 100Ah/20A = 5hours like you have done. There will be discharge curves one can apply and one of the best places to get detailed info is probably battery university. You can...
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    Wireless signal needed from motorcycle to backpack - don't know how

    Actually with the Arduino there are libraries included which makes the writing much like basic. Quite simple really, read the brake light is on, send instruction for relay 1 to operate remote brake indicator. A few seconds or whatever send another to turn it off. Same with other channels. Kids...
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