Hello, i'm gonna buy these IR LEDS
https://www.everlight.com/file/ProductFile/IR333-A.pdf
Could you please tell me if they are good for 1/1.5 meter distance and what kind of resistence should i put ? I don't know how to populate the voices provided in the specs into this site http://led.linear1.org/led.wiz
Looks like that datasheet has some conflicting info on pg 3.
Absolute Maximum Ratings table:
"Continuous Forward Current I
F 100 mA" -- no restrictions noted for 100 mA continuous use.
Electro-Optical Characteristics table:
Voltage forward "I
F=
100mAPulse Width
≦100μs ,Duty
≦1%" -- major restrictions on pulse width (how long it is on) and duty cycle (% of total time it is on) for 100 mA operation.
------------------
Here are some safe values to enter in the LED calculator.
Source voltage: 5
- I assume you'll be running these with 5v. Enter "12" for 12v.
Diode forward voltage: 1.2
- The table on pg 3 lists several possible V
F values.
-- 1.2v will give you a continuous 20mA current draw with no restrictions on pulse width or duty cycle so this is a safe value to use.
-- The other values have major restrictions on pulse width and duty cycle.
Diode Forward Current (mA): 20
- The other values have major restrictions on pulse width and duty cycle.
Number of LEDs in your array:
- Not sure how many LEDs you will want/need.
View output as: Wiring diagram
Scott