I'm currently working on a project to indicate 3 levels of ambient light intensity using 2 LEDs as the indicators.
For:
Good light - Both LEDs on
Medium light - One LED on
Poor light - One LED flashing at about 1 Hz
At the moment, the best solution I can come up with is using a LDR to assist turning on 3 NPN transistors at different light intensities.
First transistor turns Both LEDs on in series,
Second transistor turns 2nd LED on,
Third transistor turns a 555 astable timer on, with the output going back to the 2nd LED.
... I'm sure this is probably not the greatest solution... does anyone else have ideas or suggestions how I could tackle this problem?
Thanks.
For:
Good light - Both LEDs on
Medium light - One LED on
Poor light - One LED flashing at about 1 Hz
At the moment, the best solution I can come up with is using a LDR to assist turning on 3 NPN transistors at different light intensities.
First transistor turns Both LEDs on in series,
Second transistor turns 2nd LED on,
Third transistor turns a 555 astable timer on, with the output going back to the 2nd LED.
... I'm sure this is probably not the greatest solution... does anyone else have ideas or suggestions how I could tackle this problem?
Thanks.