Problem driving a laser pointer
Hi,
As a beginner, I am trying to drive a laser pointer from a PIC16F84 using this simple program:
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loop: High 0 'Turn on LED connected to RB0
Pause 1000 'Delay for 1 second
Low 0 'Turn off LED connected to RB0
Pause 500 'Delay for 0,5 seconds
GoTo loop 'Go back to loop and blink LED forever
End
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For sure it flashes but it looses much brightness.
I tried to drive the laser pointer from a TIL111
using the following circuit but it still looses much brightness.
http://www3.sympatico.ca/louiscimon/...9v%2016f84.pdf
I suppose that "High" is in fact an oscillation that is not a continuously "on".
I have the same difficulty trying to drive a piezzo buzzer
(Velleman SV10) : it looses much loudness in the process, even driving it from 18 v
with the TIL111.
I would like to understand and find a solution.
Thank you very much
Louis Cimon
Québec, QC
Canada
http://www3.sympatico.ca/louiscimon/
Problem driving a laser pointer
Hi Jumper,
Thank you for your input.
I changed the resistor for a 470 ohm.
I am reading 4,92 v between rb0 and ground
and 4,92 v between TIL111 pin 1 and ground
I am reading 8,35v between TIL 5 and battery and the battery produces 8,35 v.
I tested my piezzo on two 9v batteries in series and the sound output is greatly reduced when I drive it with the TIL111 compared to driving it directly with the batteries. The voltage readings of the batteries and the TIL11 output are the same.
Solution?