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  1. J

    Picaxe-controlled LED glow staff

    Yup, just a quick one so only a few patterns, but it gives you some idea of how it looks:
  2. J

    Picaxe-controlled LED glow staff

    Hi All, I've a detailed write-up of the build of my LED glowstaff at http://happyinmotion.livejournal.com/tag/mitochondrion. It uses an overclocked 40X1 to control eight PCA9625 drivers to control forty RGB LEDs to display over a hundred animated patterns. In the write-up I've tried to share...
  3. J

    Filtering, the serial terminal, and dealing with noisy sensors

    I've just finished the a couple of pairs of motion-controlled glow fans for dancers, described in this post. Anyway, this project has raised a couple of questions for me: 1) Accelerometer output is noisy as so I've assorted code in there to filter this via a running average. I'm trading off...
  4. J

    Motion-controlled glow fans

    Here's the latest project - motion-controlled glow fans for dancing with. Inside each is a Picaxe 20X2, reading a 3-axis accelerometer, working out the hue from the angle of acceleration and the brightness from the total acceleration, chucking that info via I2C to a PCA9633 LED driver, which...
  5. J

    Is this how EEPROMs die?

    I'm having odd problems with an EEPROM. Certain locations are unwriteable, the rest if just fine. For example, here's some test code to load test data to a particular location: -------------------------- ' Setup hardware addresses SYMBOL EXTERNAL_MEMORY_ADDRESS = %10100000 SYMBOL eeprom_pointer...
  6. J

    Calibadc problems

    I'm getting something odd, after upgrading to 5.2.5. Previously to the upgrade, my code was reading the battery voltage via a 27k/27k voltage divider and readadc10. With the calibration from calibadc10, I was getting results within 3% of my cheap multimeter. However, now: calibadc b0 debug...
  7. J

    Latching the reset pin

    Can a Picaxe (28X1) be safely left with the reset pin pulled to ground for quite some time (days)? I'm running short on space on the usable surfaces of the 'box' that contains the current project, and one means of turning the thing off is just to latch the reset switch. I've looked through the...
  8. J

    40X1 - TQFP Surface Mount format

    I note that Techsupplies has the 40X1 in a QFP surface mount package. However, the Picaxe manual only lists pin-outs for the 40-pin DIP version. The packaging info in the Microchip datasheet (PIC16F887) lists all the pins, but I'm having some difficulty translating Microchip pin names to Picaxe...
  9. J

    Stable battery power supply with fluctuating load

    I'm using a 28X1 to control 40-odd RGB LEDs using eight PCA9532 i2c drivers, powered by 4 AAA NiMHs. It all looks most trippy, but testing has found a failure mode that I'm trying to find a way around. When the batteries are tired, the system runs just fine, but is no longer programmable. What...
  10. J

    Well, it was working just fine...

    Bought VSM this morning, isn't it great? I'm building a two-channel ADC, using a dual op-amp, so, lay out the circuit, add a signal generator to simulate the mic, connect up the virtual osciloscope, and it just works. Brilliant. Except, it's now stopped working. Hmm... I get the following...
  11. J

    Yet Another Download Problem

    This seems a common scenario - new circuit, Picaxe soldered in, can't download a program to it. So to save everyone's time, I've been through as much debugging as I can think of, and I think I've found the problem (or at least a problem). Picaxe (28X1 SMT) has power, reset pin is high...
  12. J

    Improving the sound detection circuit, part 2 - Op Amps

    Okay, I built the circuit that Boriz suggested, thanks Boriz: http://img223.imageshack.us/img223/5739/audiosensorob2.gif And it works, it works better than the version with transistors. Its getting there but the sensitivity is still poor. It doesn't quite have to be be inside the speakers, but...
  13. J

    Improving the sound detection circuit

    I'm working on using a 28X1 to control a bunch of LEDs for a rave toy. Hence I want these LEDs to be sound-responsive. So I built the sound detection circuit as described at: www.rev-ed.co.uk/docs/picaxe_sound.pdf Changed the holding capacitor C4 to a much smaller value (470nF to 22nF) so that...
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