Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Light Detector Circuit Suggesiton?

Status
Not open for further replies.
M

mertkan65

Junior Member level 3
Joined
Nov 24, 2004
Messages
30
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Location
Ankara/Turkey
Activity points
279
Hi everybody. I am new here. I search the old topics but I cant find any idea about my problem.

Now, I have to implement a system such that it senses the amount of ambient illumination level and indicates it using an indicator. I want to use an array of LEDs to indicate the amount of illumination.

How can I make this circuit? Are there any book or documentary that you can suggest?

Thanks for your help..
 

picotube said:
AMBIENT LIGHT SENSOR (ALS)
h**p://www.taosinc.com/
Click to expand...

Thanks for your reply. But I need open circuit configuration :roll:
 

Tandy/Radio Shack sells photo resistors. Make a bridge circuit with an op amp stage. Then you will need some comparators to detect the different voltage levels and each comparator can drive a LED.
 

flatulent said:
Tandy/Radio Shack sells photo resistors. Make a bridge circuit with an op amp stage. Then you will need some comparators to detect the different voltage levels and each comparator can drive a LED.
Click to expand...

I had just thought the same thing but I hadnt been sure of my thought. I made some circuit designs, but I wonder are there any circuit schema in some documents or someone.
 

mertkan65 said:
flatulent said:
Tandy/Radio Shack sells photo resistors. Make a bridge circuit with an op amp stage. Then you will need some comparators to detect the different voltage levels and each comparator can drive a LED.
Click to expand...
I had just thought the same thing but I hadnt been sure of my thought. I made some circuit designs, but I wonder are there any circuit schema in some documents or someone.
Click to expand...
Here's the circuit.
 

I think one LED should be enough to do the job by using a TIA. More light more current. Output higher potential.
 

You can built a circuit with op-amp stage and bar graph LED display IC. This you can find within this forum or enywhere else on the web..
 

Thanks for your posts. I made my own design. Here is the circuit. I simulate it and it works properly. I am waiting for your opininons.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top