LEDs

Hi all, I hope people can help with this, cos I'm baffled.

I've been using a picaxe 08M2 (the new one) to control a stepper motor, which works fine until I want to use the free input to trigger the motor.

When I do that no input affects what the chip is doing

I took it back to the program, nothing odd there, so I tried using a pushbutton switch to turn an LED on and off.

If I use this program:

main:

if pinC.3 = 1 then

high 1

It seems to me some very cheap devices are not used to their full potential in robotics. Currently I am focused on optical mice. There are tutorials on the web and even an easy to use PS2 library for Arduino but I never see a robot on LMR using them.

I am currently experimenting with a cheap PS2 optical mouse as a high resolution quadrature encoder. With a resolution of 800 DPI, I can get an accuracy of 3600 counts per revolution (1/10th of a degree) by having the sensor mounted near the outer edge of a disc about 40mm in diameter.

hello
im building a flashing heart for my girlfriend, im using a 555 chip and 7 LEDs

i have a circuit lay out from multisim it says it will work but i have my doubts 

 i wanted the potentiometer to change how fast the LEDS flash on  multisim  its always the same soo im not sure why 


im using 10 mm LEDs  

Well i have an idea in my mind about a mini christmas project but i dont know how to make it.

The idea.

It will be an arduino with a buzzer ,a small lcd display (16x2 probably) ,a big red push button and some red leds.

What this thing is going to do ?

Every time you connect it to your pc though usb port and you push the red button it will tell you how many

days , months,minutes ,etc are left for the christmas eve ,new years eve .

Hi guys,

I am trying to get an LED (attached to the i/o port of a microcontroller) to fade in and fade out without using PWM.  I hooked up a resistor and LED pair in parallel with a large-ish polarised capacitor, thinking that as the cap charged it would prevent some current getting to the LED, resulting in a fade up to full brightness.  When power was removed the cap would then slowly empty it's charge through the LED, resulting in a fade out.  It worked for the fade out but not the fade in; it simply went to full brightness when power was applied.

Hi All!

I've got in mind a project that will involve a couple hundred LEDs that have to be independently controlled. I want to  make a clock where the individual seconds, minutes, hours, days of the month, and months of the year are represented by a lit LED. As the LED's representing seconds passes 60 seconds and goes to the next minute, all the "second" LED's go out, one "minute" LED turns on, and the seconds start over with all of them being dark. The process repeats indefinitely and cascades into hours, days, months.