Comments (11)
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Thank you for your quick respond. I found the hot spot at SYMBOL_PERIOD 2400 & changed the threshold which is still perfect square wave on the oscilloscope, unfortunately my photodiode won't detect any faster than that. But I'm glad the LED is above the threshold of human eye to perceive.
Thank you once again 👍
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from arduino.
Oh sorry, it's a phototransistor. I use a macro lens to magnify in order to improve the signal.
http://www.vishay.com/docs/81321/tept5700.pdf
Bought it from: http://my.element14.com/vishay/tept5700/photo-transistor-npn-570nm-5mm/dp/1497676
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Cool.
Yea, because I need to match the wavelength with the transmitter, most receivers are at IR range.
To achieve a standard communication system, other than modulation, what else could be implement into this project? (If arduino could handle it)
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@Jozhxy Can you help me with this? please [email protected]
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@shivanksharma91 For this case, only IR is fast enough to modulate cuz it's the standard.
LED will dim as it doesn't have much time to stay fully on or off. There's only few that manufactures high switching LED & phototransistor/diode which are very costly.
You can use function generator as an external modulation into AND transistor or if you can code a fixed modulation frequency while sending data in Arduino, maybe extract IR library and modify it.
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@Jozhxy thanks for the quick respnse, i need help in using photodiode at receiving end. If i just replace the led with photodiode on the receiving end and upload the code, will it work? Since i cannot really understand the code, i am new to it.
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The code sends out by frame, loop Hello Word 1 to 10.
Try it short distance, adjust to lower speed first in the code. Get a variable resistor to adjust photodiode sensitivity like IR receiver circuit.
See other issue posted before for further info of the code
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Related Issues (20)
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