Light Sensor ??

H

Hansen

Member
I wan't to make a light sensor that i can place on my monitor

it have to see light or black in a square 8 * 8

I only want to have in for if the is no light

plan was to use a 08M so it can interrupt my 20x2 with high(NO light)

the size off the check place is 10 pix high

look for light sensor & example for a program
 
E

eclectic

Moderator
Hansen said:
I wan't to make a light sensor that i can place on my monitor

it have to see light or black in a square 8 * 8

I only want to have in for if the is no light

plan was to use a 08M so it can interrupt my 20x2 with high(NO light)

the size off the check place is 10 pix high

look for light sensor & example for a program
Click to expand...
How big is 10 pix in millimetres?

e
 
S

SAborn

Senior Member
You may well be able to use a led for the sensor.
Simple and easy, im just not sure if it will react to the light levels enough.
Be worth a try with maybe a 3mm led or even smaller.
Different colour leds will likely give different results.
The lense would need to be pressed against the screen and may pay to use a smd one as they are small and flat without a lot of bulky lense.
Easy to test out with a bit of sticky tape.

Just a thought.
 
W

westaust55

Moderator
Maybe even a small LDR is an option.
They have a flat surface so easy without mods to the LDR to make contact with the screen.
Do not know where you live, :confused: but here in Australia for example, local Rev Ed agents, MicroZed sell a small roughly 5mm diameter LDR – it will ft through a hole drilled for a plastic LED mount.
By comparison, Jaycar and others here sell larger LDR’s which are around 10 to 12mm in diameter.

LDR’s do take a brief time (see the relevant datasheets) to react to a change in light level so need to consider if reaction time is critical.
 
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