Recent content by Jaguarjoe

  1. J

    Picaxe double integration?

    I'm baaaaaaaaaack! My latest project is a tremorometer, a glove with three axis accelerometers on each finger tip. This will allow me to quantify how my fingers shake due to the essential tremors I suffer from. I would like to integrate the accelerometer's signal twice to give me velocity as...
  2. J

    ADC input Z

    Hi guys, I've been gone for quite a while due to an extended bout of stage 4 esophageal cancer. I have more stitches than a baseball! Actually, the cancer itself was pretty greuling but once all the surgury was over I had no aftereffects. I can't say that at all for the chemotherapy though. It...
  3. J

    I must be missing something

    I was thinking about this while I was laying under my Jeep: Feed a 0-5v signal into a 10 bit ADC and you get ~1000 bits of resolution, which ain't bad. But- What would happen if you took that 0-5v signal and subtracted 2.5v from it with an op-amp? Now you have 0 to +2.5v and 0 to -2.5v. Take...
  4. J

    crystal heater

    Somebody here might get a kick out of this, it's pretty novel: http://www.romanblack.com/xoven.htm
  5. J

    PWM'er

    Here's a new LTC part that is a self contained PWM generator. It just needs a couple resistors and a 0-1vdc input signal. It could take some of the load off of a Picaxe or other uC: http://cds.linear.com/docs/Datasheet/69921234fb.pdf
  6. J

    AD5235 digital pot

    Has anyone interfaced a 'axe with an Analog Devices digital pot? I want to make a Wein bridge oscillator. It requires 2 identical caps and 2 identical resistances for setting the resonant frequency. To make it tunable I can either use a dual gang variable cap that's as big as a house or a dual...
  7. J

    MAP sensors

    I would like to build a simple vacuum gauge with a bi-color LED output. Low=red, medium=red+green, and high vacuum = green. This will help teach my wife to learn how to live with $4/gal fuel. Anyhow, I need to know if an 08M can work with 160Hz square waves. I can get MAP (Manifold Absolute...
  8. J

    accurate/high res temperature reading

    A couple of weeks ago someone here wanted to measure temperature to a high accuracy and resolution using a thermistor. I just learned about these devices which might do the job for him: http://www.statek.com/products/pdf/10162.pdf Instead of fretting over maintaining a constant crystal...
  9. J

    Cool resistance calculator

    I found this today. If you need an odd value of resistance, it will calculate the various combinations of the 2 E24 series resistors required to make what you're looking for. It also shows the % deviation from the target value. http://www.sengpielaudio.com/calculator-parallel.htm This a real...
  10. J

    Free to a good home

    I have 20 new and unused Nichia high brightness LED's that were engineering samples for an LED street lamp project. 15 are #NS6W183JE 5 are #NS9L153MJH3E I have no data for Vf or If or anything else other than each unit contains 8 LED's. All are mounted on aluminum substrates. Free to a good...
  11. J

    Manual #3

    Maybe this is just a typo: Manual #3 shows how to interface the uP to MOSFETs. It uses IRF530 parts. IRF530's are a poor choice to use with a uP because it is not a logic level device. The gate threshold can be as high as 4 volts and it requires 10 volts to pass full current. With a 5 volt uP...
  12. J

    Wired

    Here's an article about a new type of wire being put on the market. It's not good: http://tinyurl.com/2eeuqq5
  13. J

    Temperature spec

    A poster asked a question based on a comment made in a post on All About Circuits which stated that Picaxes are not industrial temperature rated. I looked in the datasheet for the 08M's base chip, the PIC12F683. In section 15 it shows a temp range of -40 to +125C and storage at -65 to +150C...
  14. J

    Economizing

    It probably costs more to do this than it does to make the right part in the first place. http://tinyurl.com/26em8eq
  15. J

    Power supply

    This looks like a good deal. A 5.5 volt regulated power supply for $3.50. By adding a diode in series with the output, the output will be about 4.8 volts, fine for 5 volt chips like the Picaxe. http://tinyurl.com/58wkxz
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