Hey guys! I hope you are fine. I am looking for some sort of help on LDR (Light dependent Resistance). I am not very much good in building circuit. But I hope that your help can make it easy for me.
I planned to build a small light sensitive circuit using LDR.
Here is the list of things which I planned to use:
1- 2 White LEDs ( 5mm) (forward current =20mA) (Forward voltage = 3.5 )
2- LDR
3- Input Voltage 4.0 volts
4- Sensitivity control ( Potentiometer )
5- Transistor
6- Switch
Now I have tried one circuit which I found on the internet. It uses an NPN transistor 3904 and worked with only one RED LED which requires less current as compared to the white LED.
The second thing I am worried about is sensitivity. I want to make it too sensitive that it only light up when there is no light. So can you kindly help me to make that possible?
I planned to build a small light sensitive circuit using LDR.
Here is the list of things which I planned to use:
1- 2 White LEDs ( 5mm) (forward current =20mA) (Forward voltage = 3.5 )
2- LDR
3- Input Voltage 4.0 volts
4- Sensitivity control ( Potentiometer )
5- Transistor
6- Switch
Now I have tried one circuit which I found on the internet. It uses an NPN transistor 3904 and worked with only one RED LED which requires less current as compared to the white LED.
The second thing I am worried about is sensitivity. I want to make it too sensitive that it only light up when there is no light. So can you kindly help me to make that possible?