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  1. KrisBlueNZ

    Simply relay circuit - help please

    nemo, I don't think that's what anyone here is trying to suggest. You said there is a fan connector, which is supposed to be 5V, but when you measured it, you measured only 3V. It is possible that this connector IS supposed to be connected to a 5V fan. The voltage could have been 3V for two...
  2. KrisBlueNZ

    Switch on load only when alternator is running?

    Yes you can use a P-channel MOSFET instead of a relay. Connect the source to the +12V rail (from CN1). Connect the gate to the K pin of U1. Connect the drain to the switched output voltage (to CN2). Replace D1 with a 1K resistor. No other changes are needed.
  3. KrisBlueNZ

    [Help!] Having all kinds of issues with a simple project.

    As Steve said, the voltage from the solar cell will drop under load. The cell that's rated for 6V and 250 mA is probably only capable of supplying 250 mA in direct sunlight, and perhaps not even then. Typical cellphone chargers are rated to supply 1A. So you need a much bigger solar panel...
  4. KrisBlueNZ

    Switch on load only when alternator is running?

    Here's a circuit that should do what you want. Here's a circuit description. The circuit connects to an automotive power supply of +12V (nominal) and 0V using CN1 and CN3. When this voltage is higher than a set level, for example 13.0V, relay K1 is activated, and feeds the +12V supply out on...
  5. KrisBlueNZ

    Help analyzing this simple circuit?

    The part marked L1 (item 1 in post #3) is an inductor, not a resistor. I think the bands are brown, black, brown, gold, which is "one hundred, 5%". It may be 100 uH (microhenrys) or 100 nH (nanohenrys) depending on the marking system used by the manufacturer. Probably 100 uH I think. I'd be...
  6. KrisBlueNZ

    Simply relay circuit - help please

    Good idea Chris :-)
  7. KrisBlueNZ

    Simply relay circuit - help please

    You can probably just use a transistor for this. I'm making a few assumptions here. 1. The negative terminal of the 3V fan connector is connected to the negative supply from the USB port. 2. The 3V fan connector is either ON or OFF; it doesn't have a variable voltage to vary the fan speed...
  8. KrisBlueNZ

    Monsoon MH-500 Speakers - Need to know what IC is in U5 on board

    Depends where you are. (There's an option in your profile for your location; it helps us if you fill it in.) It's a common IC. Here are the product pages for three American e-tailers who will ship worldwide: http://www.digikey.com/product-detail/en/TLC555CP/296-1857-5-ND/277502...
  9. KrisBlueNZ

    Pic programming and SPI connections

    I feel that you have taken a patronising attitude to me in your last post. I found your initial description difficult to understand. The English was not good, but I can deal with that, if I can see that the intended description behind the words is clear and thorough. After re-reading it several...
  10. KrisBlueNZ

    Rice Cooker

    Thanks Miguel. That explains a lot.
  11. KrisBlueNZ

    Pic programming and SPI connections

    Your English is not clear. But I think I'm beginning to understand what you want. Please provide links to the data sheets for the transmitter and receiver modules you have. These should have been in your first post.
  12. KrisBlueNZ

    Set Arduino pin to High Impedance (floating)

    That's an intersting idea. On the AVR (and in general), you set I/O pins to the high impedance state by turning OFF the corresponding bit in the DDR (data direction register) for the port. For the AVR, you also have to ensure that the output state for the port, in the PORTn register, is 0; if...
  13. KrisBlueNZ

    Rice Cooker

    That's exactly what I asked for and you've done a good job, so I'm really sorry to say that it's not enough to enable me to understand how it all works. Perhaps another photo looking nearly straight at the bottom would help. Also, close-ups of the switch stack (2) from several angles might...
  14. KrisBlueNZ

    Relaxation oscillator Noob need education

    Bob, shhh! No! This is a PUBLIC forum! One more slip-up like that and we may have to kick you out of the Illuminati...
  15. KrisBlueNZ

    Send data with one wire protocol?

    Thanks for the expanation. I've had a look at your code, the data sheet for the MCU, and the other information you've provided. In my opinion you are a long way from being ready to write this code. You do not have a specification of what you want to do with the 1-wire interface - you haven't...
  16. KrisBlueNZ

    Send data with one wire protocol?

    Do you have a schematic diagram for the one-wire interface in the Arduino slave? Do you have a schematic diagram for the one-wire interface in the STM8S circuit? What other functions does the firmware in the STM8S module need to perform? What internal peripherals are available to the 1-wire...
  17. KrisBlueNZ

    Rice Cooker

    CC, I think the problem is that the thermal fuse is opening because it gets too hot. I assumed this would be caused by a failed thermostat, because of the discoloration, the fact that it boils the water and produces steam, and the fact that a 142 degrees Celsius thermal fuse is popping. But it...
  18. KrisBlueNZ

    Pic programming and SPI connections

    I don't really understand what you're after, but this site might be useful: http://rfsolutions.co.uk/
  19. KrisBlueNZ

    Rice Cooker

    I don't think that circuit diagram is going to be of any use. Can you take a photo looking almost directly at the underside of the bowl, add numbers to the photo for every item, and make a list that has the numbers, and for each number, everything you can tell us about that item in the photo...
  20. KrisBlueNZ

    Rice Cooker

    We've got a rice cooker and it doesn't boil. It doesn't really make steam either. I can't identify it in that picture either, but you may be able to find it through a process of elimination. It will be attached to the metal so it can monitor the temperature, and it will have two contacts, and...
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