Using the Unregulated Motor Block and Conversion Cable to Light LEDs

The light turning off happens because of the Device Connection Manager in the EV3 firmware. The algorithm used to detect when a motor is connected relies on there being a load on pins 5 and 6 of the output ports to determine if the motor is a Large or Medium motor. The 8528 adapter cable only has wires on pins 1 and 2. When you use a VM command (via a programming block or by using the on-brick app) to tell a motor to run, it forces the motor to run, but then the device connection manager immediately resets everything because it does not think that a motor is connected.Also see How to use Power Functions with Mindstorms EV3?The fact that setting a power of -100 keeps the power on continuously, though, is new to me. I am at a bit of a loss to explain that observation. UPDATE:I've done some digging and now I better understand what is going on.Output port pin 2 is connected to pin 6 via a 100k resistor as seen in the schematic diagrams below.When the EV3 is instructed to run a motor in the forward direction pin 1 will have battery voltage and pin 2 will be at 0V. When running in reverse, however, pin 1 will be at 0V and pin 2 will be at battery voltage.When using the converter cable, nothing is connected to pin 6 externally, so it will also be at battery voltage (pulled down slightly by R216 to 5V). This triggers an event in the device connection manager. Most of the time (but not 100% of the time) the EV3 will think that it has a motor attached because of this and so the LED will stay on

1. How many LEDs can two AA bateries power?

You are missing one crucial piece of information, the amperage of the LEDs you are using. The lower the amperage, the greater number of LEDs

2. Why are optical mouse LEDs red? [closed]

No.Any colour can be used.No.Both.For more information, see this Wikipedia article

3. How do I enable LEDs by increasing voltage?

I mean I got 10 LEDs in serial and if I change voltage to 1V I want first LED to switch on. Then 2V and 1. and 2. LED switch on. If 10V all LEDs are switched on. How to do this please? Should I use transistor? Or something like that?

4. fluorescent.... are they really the best thing to use? i hear of LEDs have replaced that statement is it true?

there is in basic terms one fact, God is love, He made us and gave us a regulation, that we broke, the penilty for breaking the regulation is loss of life, yet experience He enjoyed us, He willingly died for us, He took our punishment, and He rose from the grave, and now if we repent of our sins and have faith in Him, we are able to be saved from sin and loss of life

5. Should I use a transistor or op amp transconductant amplifier for LEDs with variable voltage?

Well how i hooked up 12V LED lights in my car i have a nice system sound n i just connected the LED lights to the amp no problem (that would be the easiest way if you have a system sound) n if you dont have a system sound make a small amplifier n no i dont think it would burn if you made it to work at volume 10 n crank it up i dont think so it should work just fine! Hope it helps! Good luck

6. What LEDs would you reccomend for this circuit?

The LED's you found at 'bestoffebuy' would be fine

7. Correcting for non-linear brightness in LEDs when using PWM

I found this guy who uses a method he calls "Anti-Log Drive". Here is the direct download link for his info

8. How can I light up 3 LEDs in sequence but only one at a time?

What you want is an LED chaser.There are a few basic ways this is done.Mechanical. That does not lend itself to repeating or automation.Build a circuit of flip flops.Use a CD4017 Decade counter, looping the 3rd output to the reset. Basically a pre-built flip-flop circuit. Just add a 555 timer.Use a 50 cent micro controller that you can get started programming for under 5 bucks. MSP430, Arduinos, etc. This is how many people would do it today, not just PhDs.How you physically arrange the LEDs has nothing to do with how you control them electronically btw

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