suntracker

hi vendorf70, when applies a voltage (5 V) to the LED and charges up the capacitor that exists at the
junction between the two types of silicon sandwiched together in the LED. Then, the RCTIME command
changes the I/O pin to input (doesn’t send a high or low signal, just listens), and measures the time it takes the
junction charge to decay below 1.4 V. This time is controlled by how much light shines on the LED. The
program measures the number of 2 μs time increments it took for the LED voltage to reach 1.4 V and stores it
in a variable named time.

' Test LED Light Detector.bs2
' {$STAMP BS2}
' {$PBASIC 2.5}
time VAR Word
DO
 HIGH 11
 PAUSE 1
 RCTIME 11, 1, time
 DEBUG HOME, DEC5 ? time
 PAUSE 200
LOOP

moreover Led are cheaper of photoresistor

Now i'm looking to do same with Arduino

Anyway basic stamp project as still some problem: Horizontal movement is not stable in continue to move back and forth

as you can see on video

I must use a feedback

If anyone have made same project please let me know

hi, i'm going to build a new one using arduino . This in the post use 4 yellow leds to chase the sun, and the chrome dish focuses

the sun. 4 switch avoid multiple turns to chase the sun and prevent that servo cables block it.

i 'll post video and basic stamp code  .

Next build will use arduino, 2 maxiservo and a plastic mirror to heat water