 | | Re: Shutting off illumination LED on Light Sensor for LIDAR —Troy McLucas
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| | | I drilled a hole in a 1x2 brick to give the light sensor a better sense of direction and to block the LED. The goal was to have the light sensor seek an IR beacon. (...) (23 years ago, 29-Mar-01, to lugnet.robotics)
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| | | | | Re: Shutting off illumination LED on Light Sensor for LIDAR —Chris 'Xenon' Hanson
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| | | | (...) Thanks for all the tips, everybody. I set out last night to open up my light sensor and add a jumper to allow me to take the LED out of the circuit. I was unsuccessful in getting the casing open, even after cutting the underside latching tabs (...) (23 years ago, 29-Mar-01, to lugnet.robotics)
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| | | | | | Re: Shutting off illumination LED on Light Sensor for LIDAR —Bernardo Dal Seno
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| | | | | (...) That's not a legOS feature. You just set the input port to passive mode, and read it in RAW mode. There is an example in NQC at (URL) (I forgot to add the address in my previous post :-). (...) You can find light sensor schematics on Michael (...) (23 years ago, 29-Mar-01, to lugnet.robotics)
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| | | | | | | Re: Shutting off illumination LED on Light Sensor for LIDAR —Chris 'Xenon' Hanson
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| | | | | | (...) Thanks. I had seen this technique (and noticed this effect myself) but had heard rumor that this impaired the sensitivity of the detector. I'm going to try some rigorous tests and see if I can verify this. (...) We almost needa Yahoo-style (...) (23 years ago, 30-Mar-01, to lugnet.robotics)
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| | | | | | Re: Shutting off illumination LED on Light Sensor for LIDAR —Matthias Jetleb
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| | | | (...) I strongly suspect this is a myth. A transistor is a transistor is a transistor. They all require biasing in order to function properly and that requires power. Mind you, even so-called passive devices must either generate a voltage or have a (...) (23 years ago, 31-Mar-01, to lugnet.robotics)
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| | | | | | Re: Shutting off illumination LED on Light Sensor for LIDAR —Juergen Stuber
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| | | | (...) Actually you don't need LegOS, any input set to raw mode with the LEGO firmware will do fine. This is because even in passive mode there is a pull up of 10k to 5V, and in fact the LED is glowing dimly in this mode. Just tried it, I can get raw (...) (23 years ago, 1-Apr-01, to lugnet.robotics)
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| | | | | | Re: Shutting off illumination LED on Light Sensor for LIDAR —Chris 'Xenon' Hanson
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| | | | (...) Yes, this is the result I discovered this weekend. My conclusion is that setting the sensor to raw mode does not fully remove the light produced by the LED, and detrimentally impacts the sensor performance. I think my next approach is to try (...) (23 years ago, 2-Apr-01, to lugnet.robotics)
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