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  1. Old Steve

    Arduino vs raw PIC, Atmel etc

    No mate, I won't give up altogether on the Arduino language. I've been studying 'Processing' at the same time, but have still managed to pick up a fair bit of the Arduino stuff already. Some of the Arduino classes are well worth using, and there are some pretty useful commands that are worth...
  2. Old Steve

    LP2950 Indecision - How would you do it?

    That makes good sense. It's the way I was leaning, ak, but I wasn't too sure. I thought it was a good idea for the same reason as it's recommended for an LM317 or similar - to stabilise the voltage across the resistor. The load will include a serial to RF board, which will draw 30 mA in very...
  3. Old Steve

    4v motor damaged?

    It depends on which way it's tilted. With the motor turning in one direction, tilt it left and it moves away, or tilt it right and it moves toward you.
  4. Old Steve

    LP2950 Indecision - How would you do it?

    I have a need for a <100mA low-dropout regulator with an output voltage of 3.45V to 3.5V It has to feed two modules, one with a minimum supply voltage of 3.4V, and the other with a maximum supply voltage of 3.6V. (Between a rock and a hard place.) I'll be feeding it with a minimum of 4.2V or...
  5. Old Steve

    Unusual 12V SLA Charger Circuit

    While it was apart I should have pulled out the oscilloscope and taken some measurements maybe, but the 'scope is deeply buried and I've been flat-out on other things, so I just quickly repaired it and put it back together. When I first pulled one apart, about 20 years ago, I was impressed by...
  6. Old Steve

    Help with a project

    You'll actually need 5 x LM3914s if you go that route, Trevor. I've attached a copy of the datasheet below. I haven't used one in many years, but they should still be readily available, I imagine. Very easy to use, as you'll see by the datasheet. Let us know if you run into problems. They can...
  7. Old Steve

    Mind & Infra Red Controlled Robot Car

    PM sent. Got my bug fixed, too. A 24-bit shift right worked. A shift right in 'Processing':- int In32bit=0x7FFFFFFF; char Out8bit=(char)(In32bit>>24); Results in 0x7F (127 decimal) as I'd hoped. It can be done exactly the same in the Arduino IDE too, but with long and unsigned char. (Just...
  8. Old Steve

    Why isn't my new 3.5" TFT LCD screen working with my Raspberry Pi B?

    Spike, does this help at all? It's about a 3.2" version, but mentions the same problem.:- https://www.raspberrypi.org/forums/viewtopic.php?f=100&t=87818 I haven't done any reading there yet. Just happened to stumble across it. This might be worth a look too:-...
  9. Old Steve

    Help with a project

    Yep. He still has to figure out how to connect them up and draw up a schematic. And if he needs/wants more than 10 LEDs, he has to work out how to string two LM3914s together. A nice, neat little learning project. One of the first things I played with when I was starting out.
  10. Old Steve

    Help with a project

    Ha ha, you read my mind Dave, regarding the LM3914, but I was leaving it to Trevor to work that bit out. (After all, he has to do something in the way of design, since it's a classroom project.) Not to worry.
  11. Old Steve

    12vDC Issues

    And double-check that the relay is actually switching.
  12. Old Steve

    Mind & Infra Red Controlled Robot Car

    Doesn't an Apple allow a screenshot using the keyboard's "Print Screen" button? (Never used one, I'm a 'dyed-in-the-wool' IBM-compatible slave.) And I was already going to suggest email for exchanging files etc related to this project, rather than posting them all here, and since PMs don't...
  13. Old Steve

    Beginner project

    Do you mean all the way out, then all the way back in each time, instead of the three-stage operation you originally desribed? Would your commercial fisherman friend want that? And what would happen in the case of a temporary power out - a bad battery connection, or an overload blowing a fuse...
  14. Old Steve

    Unusual 12V SLA Charger Circuit

    I guess you mean C1? (The bottom one.) I wouldn't have thought smoothing was needed - the battery would already act like a big capacitor. Many old car battery chargers connect the rectified DC from the diode bridge directly to the battery without smoothing at all, and only bi-metal contacts for...
  15. Old Steve

    Mind & Infra Red Controlled Robot Car

    5:30am and I'm still awake. I realised I made a blunder with my graph. I set it up for 11 8-bit values. Turns out that only the signal strength, attention & meditation are 8-bit. All others, alpha, beta etc are 32-bit. I 'think' that all I need to do is shift the values right 24 bits, (3 bytes)...
  16. Old Steve

    Mind & Infra Red Controlled Robot Car

    Nope. I saw your thread, but can't help there. I thought about replying to bump it back to the top, though. :D I just replied above, too. And you'll be surprised at how little needs to be changed to make Arduino into C.
  17. Old Steve

    Mind & Infra Red Controlled Robot Car

    I could do that with short sketches, or snippets of code. But I need to get used to the Arduino language first. I haven't done much yet. No point until I actually have the UNO. (And don't get too advanced too fast with Arduino, or you'll beat me and I won't be able to translate it to C.)...
  18. Old Steve

    Help with a project

    Yep, I thought about something like the Playstation buttons too. I guess they also work on variable resistance. Might be capacitive. A slider pot and xxxxxx chip would do it easily. :D Long travel though.
  19. Old Steve

    Mind & Infra Red Controlled Robot Car

    Just looking through the Arduino reference, the "String" class is supported, but it will be very heavy on program memory, as are a lot of the other Arduino commands and data types/classes. Anywhere that you can use char and the associated C character-handling functions I mentioned, you'll be...
  20. Old Steve

    Help with a project

    It takes you over the Wheatstone Bridge. Edit: It really depends on the level that Trevor is working at. Since only a LED display was asked for, I think that a load cell, Wheatstone bridge and instrumentation amplifier might be overkill, and above the level of the class. That's why I suggested...
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