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Infrared Led Diodes
How to Calculate ohm resistance needed for a circuit?
I wanna run a complete simple circuit consisting of 3 infrared diodes (IRED?), 1 LED, and powered by 2 AAA batteries.
My question is, how do I calculate the type of resister I need so I don't blow up the LED and the IREDs. I can only assume that the ohm resister value needed doesn't depend on the type of LED/IRED I use.
As a 2nd question, if I add one or two more AAA batteries to power the circuit, does that mean I need to change the resister as well?
The resistor(s) values DO depend on the specifications for the LEDs (all 4) that you have. The IR diode is actually an IR LED.
With only 3 volts, you will need a resistor for each LED, and that resistor value depends on the Vf of the LED and the current spec for the LED. Each string of 1 LED and 1 resistor is across the battery, in parallel.
I'll do one sample calculation. If the Vf of the LED is 2 volts and you want 20 mA of current, and you have a 3 volt battery, the R = (3–2)/0.02 = 50 ohms.
If you change to 4.5 or 6 volts (3 or 4 cells) then you have to change the calculation. And, depending on the Vf, you may be able to put two in series, so, instead of 4 different strings, you may have only 2 or 3 strings.
Email me when you have the needed info.
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Testing IR transmitter diode
I have one infrared LED and an infrared photo diode. How do i make an obstruction sensor out of these?
I have an infrared LED and an infrared receptor (which looks similar to an LED).
Now, my idea is to create an obstruction sensor such that when the obstruction is removed from the path of the light from the IR LED, the sensor should pick up the light from the LED and should let current pass (to a transistor, which then opens up to power an alectromagnet).
Can u please help on how to realise this.
Please also help me with information on supply voltage and the polarity.
I am not sure on an obstruction, but on power supplies and polarity I can help you with. are you wanting to know polarity of a power supply or the diodes?
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