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IR Beacon - Page 2 — Parallax Forums

IR Beacon

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  • vla7vla7 Posts: 79
    edited 2009-04-08 02:47
    Yup, I measured it with a meter.
  • vla7vla7 Posts: 79
    edited 2009-04-08 02:51
    Ok, I just double checked it and got 3.9V instead of 3.5V.
  • vla7vla7 Posts: 79
    edited 2009-04-08 03:02
    Ok, it's between 3.6V and 4.0V depending on which 9V battery I use.
  • kwinnkwinn Posts: 8,697
    edited 2009-04-08 22:19
    The resistor values (470, 1450) will give approximately 40% on time so an average of 53mA/3.6V would be a peak of 132mA/9V which is what is expected. That is a 61mA peak current through the leds. I hope that is within their rating. Are you able to pick that up at the required distance?
  • GWJaxGWJax Posts: 267
    edited 2009-04-09 02:44
    kwinn said...
    The resistor values (470, 1450) will give approximately 40% on time so an average of 53mA/3.6V would be a peak of 132mA/9V which is what is expected. That is a 61mA peak current through the leds. I hope that is within their rating. Are you able to pick that up at the required distance?

    Here's a nice stable circuit that works great. All values are in the small box along with the schematics. This is just incase you can not get the other one working the way you want..

    Jax

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    If a robot has a screw then it must be romoved and hacked into..
    pdf
    pdf
    IRBeacon.pdf
    11K
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