reading electricity meter ir impulses


Posted on Feb 5, 2014

Yesterday I was triyng to read the infrared impulses from my electricity meter. The phototransistor I`m using, can see the IR from all the remotes in the house. but doesn`t read the blink from the electricity meter. I can see the IR blink of the meter with any camera, is bright and powerful enough. I wonder why the phototransistor doesn`t see it


reading electricity meter ir impulses
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You see the remotes since they put out a long train of pulses, the meter is apparently only putting out one short pulse. So either the frequency response or the sensitivity of the phototransistor is too low. Do you have an oscilloscope that you can view the signal with You see the remotes since they put out a long train of pulses, the meter is apparently only putting out one short pulse. So either the frequency response or the sensitivity of the phototransistor is too low. Do you have an oscilloscope that you can view the signal with But I don`t really understand your circuit. You have a 10k resistor going from the PT to pin 2 of the Arduino. So how does the Arduino bias the PT What is the mode of pin 2 It would seem that you would want the resistor going to +5V and the junction of the PT and the resistor going to pin 2. Just saw in Arduino`s documentation that I actually have a problem in my code. I`m trying to turn the status LED on and off there. and that`s not possible with a delay (just learned that delay doesn`t work in the function called by attachInterrupt: ). You were right, the impulse probably is too short and I don`t have a blink and with remote control works because they put out a long train of pulses. I should modify the code to: But I don`t really understand your circuit. You have a 10k resistor going from the PT to pin 2 of the Arduino. So how does the Arduino bias the PT What is the mode of pin 2 It would...




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