Where are the schematics?
If you are using a 555, you could use the output of the photo detector to hold the reset pin of the 555 low when light is present and high when light is not present... A transistor could work as an inverter.
Whas this what you were asking?
Activating a circuit using a photocell
- 8th May 2006 02:58 AM #1mtrails
Activating a circuit using a photocell
Hi,
I'm on the low scale of elcectronic engineering, and basic knowledge of basic circuitry, and have two scematics of circuits I would like to combine as one:
Circuit 1
A basic LED alternating flasher
Circuit 2
A photocell detector
Objective: Use the photocell detector to activate the alternating LED circuit. When light is present, the alternating LED circuit is OFF. When light is diminished, the LED circuit is switched ON.
The schematic of the photocell detector, uses 3 LED's as indicators. If possible, is there a controlled circuit that uses the voltage recieved of one of the LED's (signaling low light), that might be interfaced with a transistor to switch on the separate circuit?
- 8th May 2006 05:25 AM #2lord loh. 0
- 8th May 2006 05:44 AM #3akg
the immediate solution comes with the 12F PIC
.. but if ur not interested with that u can do it with a comparator and 555(as blinker)
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- 9th May 2006 03:51 AM #4mtrails
Originally Posted by lord loh.
Yes.
Here is the link to the schematics:
Photocell Detector http://home.cogeco.ca/~rpaisley4/xComp555photo.html
LED Flasher http://wild-bohemian.com/electronics/flasher.html
Thanks0
- 9th May 2006 06:26 AM #5akg
u connect the o/p of the photocell detector ckt (using 555 ) to pin 4 of led flasher (using 555) . the 555 requires a 'high' on pin 4 to oscillate which is provided by the photo-ckt during dark .
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- 10th May 2006 05:13 AM #6mtrails
Great! Thank you for your responding to my inquiry.
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