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  1. Old Steve

    motor driver 12v .. 2a... fail~

    Usually Usually, transistors fail open-circuit. MOSFETs tend to fail short-circuit.
  2. Old Steve

    pressure measuring device

    I don't know. How did you plan to use a single compression load cell so that it could weigh a large object? Whatever you had in mind can also be used for a strain gauge load cell. Just mount one end solidly, and the pressure is applied to the other end. Or use 4, on for each corner, and make...
  3. Old Steve

    Simple timer

    This one comes pre-assembled, by the look of the listing:- http://www.ebay.com.au/itm/Electronic-Liquid-Level-Controller-Sensor-Module-Water-Detection-Sensor-5V-/281440233982?hash=item41872529fe You can probably cut the probe board down the centre to set each half up for the high and low...
  4. Old Steve

    Simple timer

    Fabian, this might do it:- http://www.ebay.com.au/itm/New-Water-Level-Detection-Sensor-Liquid-Level-Controller-Module-DIY-Kit-Good-/271607310692?hash=item3f3d0ea964 You'd need to make your own probes, to set at the levels that you want, by the look of it. (See function 1 2 - oops - in the...
  5. Old Steve

    Simple timer

    Alec, we were typing at the same time, but thinking alike. :D
  6. Old Steve

    Simple timer

    I would normally suggest that you might be better off sensing the water levels in the bucket you're draining, turning on the pump when it's full and cutting off the pump when it's empty. (3 probes) Being unable to solder easily makes that more difficult though. I've been looking for a suitable...
  7. Old Steve

    Hacking a Mattel Mindflex Headset for Brainwave Control

    Ha ha. And actually, we don't have Halloween here - it's an American thing. There's very little need to do anything in asm. On rare occasion, a tiny bit of inline assembly in a C program is helpful, but otherwise I avoid it like the plague. :D With regard to Arduino, there are benefits to...
  8. Old Steve

    pressure measuring device

    I have no idea, but doubt it very much. Have you tried Google? Generally a compressive load cell is more expensive than a normal strain gauge type. You could set up strain gauges in a 'sandwiched' situation.
  9. Old Steve

    pressure measuring device

    Actually, many strain gauge type load cells have 4 strain gauges in the one load cell - one for each resistor position in the Wheatstone bridge. (Full bridge operation) And there's a little more to it than what I described in post#19, but that's the basics. Getting good accuracy isn't easy.
  10. Old Steve

    PWM led without timer

    I'll go so far as to show you how to set a timer. You can work out the rest. It'll be good practice:- // Set up prescaling:- // 0x00=stopped, 0x01=CLK/1, 0x02=CLK/8, 0x03=CLK/64, 0x04=CLK/256, 0x05=CLK/1024 TCCR0B = 0x05; // Initialize the counter:- TCNT0 = 0...
  11. Old Steve

    PWM led without timer

    You ignor You ignored all of my questions, including several requests to post your code, yet expect me to jump and upload more code for you? You asked for a solution without timers. You have it, you said.
  12. Old Steve

    Linker files

    It was about lunchtime here when you replied. That pullup resistor wouldn't have helped, since your code relies on the opposite. Let me know how you go. (And try adding that LED flash on startup. I always do. It's pretty useful.)
  13. Old Steve

    Trouble with solder

    Not me - I ride an electric bike. ;) And I'm not worried about the lead in solder. That's why I still use leaded solder.
  14. Old Steve

    PiezoElectric Tiles

    A nylon pot-scouring pad does a good job, too.
  15. Old Steve

    Hacking a Mattel Mindflex Headset for Brainwave Control

    Thanks mate. I struck a little set-back, so have to sit on my hands for a couple of weeks and can't do anything - the headset is sending data OK, and I can parse and decode the whole stream without any problems, (it's only 32 bytes as I found), but it was only sending '0' for "Attention" and '0'...
  16. Old Steve

    pressure measuring device

    You'll need to do some research on using a load cell. Have you considered Googling "load cell circuit" or similar? Even better, "load cell Wheatstone bridge" or "load cell Wheatstone bridge circuit". In effect, you need to use a Wheatstone bridge, with the load cell in one leg, (a 1/4 bridge...
  17. Old Steve

    pressure measuring device

    As I mentioned, this is useless for measuring weight. It's a waste of time, for number of reasons, the two main ones being large variations with humidity and the fact that the foam doesn't return fully to original thickness after compression, especially with repeated use. If it was any good for...
  18. Old Steve

    PiezoElectric Tiles

    @Dave Benemerito, it's certainly an advanced subject that you're getting into. I think a bit of encouragement is in order. It's really good to see you having a go. I just found a couple of papers on the subject that you might want to read. There are some hints in them, but I couldn't find any...
  19. Old Steve

    Trouble with solder

    It worked OK, Dave, but just didn't feel the same. I guess I should be more ecologically aware - I am when it comes to recycling, but as soon as it felt different I gave up. :rolleyes: I think that roll of lead-free solder is still here somewhere. I might dig it up and give it another go. (Most...
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