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  1. CDRIVE

    Advice on LCD display for Picaxe project.

    Hey, just had a thought! Why mess with PNPs when you can just invert the code by making C.2 normally low and bringing it high to turn on a NPN? In this case the Collector will be connected to "K" and Emitter connected to GND. A 1K base resistor still applies. Chris
  2. CDRIVE

    Advice on LCD display for Picaxe project.

    Not quite like that. If you're using a PNP that turns on when the Picaxe pin goes low you want the Emitter connected to "K" and the Collector connected to GND. Don't forget a 1KΩ between the picaxe pin and the transistor Base. Chris
  3. CDRIVE

    Advice on LCD display for Picaxe project.

    I just whisked off an email to my contact at DesignSoft that makes my favorite schematic capture/spice simulator TINA. I love Picaxe but TINA doesn't support them. This forces me to use PicaxeVSM, which is not a Picaxe product. It's a scaled down version of PROTEUS/ISIS. It's a clunky app which...
  4. CDRIVE

    Advice on LCD display for Picaxe project.

    Admittedly I didn't examine and scrutinize the entire app. I settled for acceptance in the syntax check. Chris
  5. CDRIVE

    Advice on LCD display for Picaxe project.

    Let's take one thing at a time. I changed only two lines of code and it syntax tested OK. These are lines 45 and 49. Chris ; ******************************* ; ***** Sample Header File ***** ; ******************************* ; Filename: ; Date: ; File Version: ...
  6. CDRIVE

    Advice on LCD display for Picaxe project.

    Is the PE editor throwing errors? If so where? Chris
  7. CDRIVE

    Problem With OPAMP

    Maybe we should be asking Sid why he thinks he should measure -1V on the output pin? Chris
  8. CDRIVE

    741 OpAmp

    I must have missed the memo. Did Google crash??? Chris
  9. CDRIVE

    Problem With OPAMP

    I don't see any of these OpAmps powered from a split (±) supply. What I do see is the (-) power pins at GND. So how can the OpAmp's output swing below zero? :confused: Chris
  10. CDRIVE

    Op Amp 741

    Jeff, you seem to have an aversion to answering questions. All the photos are nice but this is going to be a long laborious thread if you don't do so. Chris
  11. CDRIVE

    Op Amp 741

    Oops, I see the meters say 115 to 120V on the face. Then resistance, impedance or input current at or near the operating frequency would be useful info. Chris
  12. CDRIVE

    Op Amp 741

    Those meters are all beautiful. Like Dave, I haven't seen one in many years but I do remember when they were common in industry. If I'm not mistaken the 400Hz meters were found in military aircraft application as they used both 28VDC and 120VAC @ 400Hz. I think the latter was (is?) used for...
  13. CDRIVE

    Help with sensing a stopped sprocket

    That's a good question. It's partially why I put an "Idle" sub in my code to cover either order of events. Chris
  14. CDRIVE

    Winco generator not producing electricity

    Proof once again that great minds think alike. :D Chris
  15. CDRIVE

    Help with sensing a stopped sprocket

    Here's a video. Well I couldn't resist the bells and whistles. Besides, that schematic was created in Picaxe VSM schematic capture / Spice software. It's not my favorite Spice app but it's the only one (that I know of) that can simulate a Picaxe. It's a clunky app but it is stable and does a...
  16. CDRIVE

    Winco generator not producing electricity

    Well, for the next guy that tries this it might behoove them to place a 1A fuse in series with the battery. Not the fastest acting component known to man but better than nothing. I'm just curious as to whether the battery even needs to remain connected while the generator is cranked? It's quite...
  17. CDRIVE

    Help with sensing a stopped sprocket

    Here's my finished contribution using a Picaxe 08M2. The circuit and code include a few bells and whistles that make it easy to see what sub-procedure the Picaxe is currently executing. You may omit these components if you wish. Doing so does not require modification of the program. This is the...
  18. CDRIVE

    Winco generator not producing electricity

    I'm curious Steve. In the other thread, which I think I remember too, was the 9V battery left connected while starting the generator? Chris
  19. CDRIVE

    Winco generator not producing electricity

    You know we often read the familiar phrase "I know just enough to be dangerous" but what you described might win you this year's top Darwin Award. You may find comfort in knowing that in my younger years I did sh!t dopier than that! :D Glad to read that it's up and running though. Moreover...
  20. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    Stu, It's always good to hear that advice given here at EP actually works! :) Don't forget, if it gets too cold do like the song says and roast your Chestnuts on an open fire. :p Chris
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