i buy one multimeter.
It looks like 1.4 amps. But i'm not sure I made the right measurements.
what do you think?
Hello, actually I tied you in the way you said. I did not mark the picture because the other ends were in the back.mahjongg wrote: ↑Wed Oct 04, 2017 12:44 pmI'm not sure you have wired it correctly, it could be that only one of the LED's is actually burning, if the arrows are pointing to where you connect the positive wires, then at least one of them seems wired the wrong way around.
this picture shows how to connect power to the two modules.
Two IR LED modules.gif
Best use an EXTERNAL 3.3Volt power supply, using the internal 3.3V of the PI might result in either very dim LED's or overloading of the 3.3V supply. Using an external supply you can turn up the brightness without endangering your PI.
Perhaps its also possible to feed these LED's 5V, but then they might get very hot, and also the transistors that limit the current might, to the point they burn up, as they would dissipate at least as much power as the LED's do..
I think you need to learn how to use a multimeter before you damage something.
Yes Peter. Good point I dont know using to multimeter. Thanks for links...PeterO wrote: ↑Thu Oct 05, 2017 11:25 amI think you need to learn how to use a multimeter before you damage something.
It looks like you have effectively short circuited the 3.3V supply.
To measure current you have to break into the circuit...
This looks like a goof tutorial for you to follow : https://learn.sparkfun.com/tutorials/ho ... multimeter
if you only want to know, if both IR LED's are working, simply use the smart-/mobile-/cell- phones camera, and watch the LEDs when they are powered up.