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  1. J

    Receiving numeric string from serial port

    Sounds like a very cool project.
  2. J

    Web Graph Display

    Wow, very prolific!
  3. J

    Web Graph Display

    I found something that's very simple but needs tweaking here.
  4. J

    Web Graph Display

    Thanks Papaof2 and Jeff. I'm swimming in all the graphing packages, I'm sure there is a simple one out there but haven't found it yet. The HTML route with Canvas is in the lead so far. I'll research the Chart.js today. I remember in the infancy days of computers you can get a graph up and...
  5. J

    Web Graph Display

    Hello, I have many picaxe chips collecting all sort of data and displaying the data on a web server run on a Pi or a PC. I would like to also display graphs, now, I use thingspeak for graphs but would like to go to a local server. There are dizzying amount of ways to serve graphical pages, I...
  6. J

    A timing question

    i rather like it when the conversation meanders a little. This board is full of brilliant polite people, everyone brings something to the party. I have dedicated film scanners, i was so worried about demise of film that i have 4 film scanners in stock. I have also filled a refrigerator with...
  7. J

    A timing question

    that's phenomenal, i have tried my own LDR volume control and couldn't tell much of a difference from an Alps pot. I have a very good system but nothing spectacular, other than the Dynaudio speakers. I'm sure my hearing has tapered off with the passing years. I hope you do well selling your well...
  8. J

    A timing question

    wapo54001, thank you for the detailed explanation of your project, very well done. i am at a point in life where i simplify things and know what i like. when i go back to the project i will have at most half a dozen positions on the volume control, of course i do want maximum fidelity and close...
  9. J

    A timing question

    I have experimented with LDR volume control circuits but never achieved smooth control. Please keep us updated with your progress and share any schematics. I have used PWM to control the LED in the LDR and it worked reasonably well. My other plan was to use a very precise D/A converter and...
  10. J

    Hayabusa

    For Australian forum members, Hayabusa2 will be dropping off it's capsule December 6th here is a link to help spot the Fireball. I wonder if there is a way to detect it using a picaxe.
  11. J

    Multiple masters I2C

    Thanks Gents. Project I'm planning is to have a box full of sensors outside of the house and have the picaxe act as a data collector, storing information in an external eeprom. I want everything running on solar/battery so the Pi would only turn on as needed and the picaxe, due to negligible...
  12. J

    Multiple masters I2C

    Hi lbenson, i have attached a 20X2 the way you mentioned and it works well. I was hoping to transfer much more data. I can transfer it using serial but i was just curious if it can be done with the I2C.
  13. J

    Multiple masters I2C

    Hello, would it be possible to have a picaxe and a raspberry pi sharing an EEPROM. My thinking is to have a picaxe write data to an external EEPROM and then have a raspberry pi retrieve that data at will. I realize they can't both be active at the same time so i would have to have handshaking...
  14. J

    PCB scope - reviews?

    Has anyone tried one of these Ultra Thin Scopes?
  15. J

    New Art / Study Project

    Really nice and such a fast turnaround. I have to learn how to use the board design software.
  16. J

    DAC Transistor

    Hi Alan, Thanks for taking the time to help. I have abandoned the NPN follower and am driving the LED through 1K resistor directly from the PWM pin. I also am experimenting with a 2K precision potentiometer between the 1K and the LED to see if varying the dropping resistor helps with the range...
  17. J

    DAC Transistor

    I have done some more tests with the optocoupler and want to build a PWM controlled LED. I had a bag of these optocouplers so I went and matched them in pairs of close matching resistances. I also ran tests with just a potentiometer and the optocoupler and here is the range I found depending on...
  18. J

    DAC Transistor

    Thank you gentlemen, I have used PWM and the wizard before but never to vary two PWM pins. Will be testing code tonight.
  19. J

    DAC Transistor

    Hello, I need more help. I have decided to go the PWM route for volume control for a different project. What I'd like to have is a volume control for each channel in a stereo setup. Idea being that I can vary the balance from distance to fine tune the stereo image. My question, Can I run 2 PWMs...
  20. J

    DAC Transistor

    Well I ran some tests with the unit and everything mentioned is true, LDR does have a very slow response, the volume takes a very noticeable time to change from led fully on to fully off. I'm aware of the logarithmic curve, by a rough estimate I have about 4 levels with the present setup, I can...
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