I am doing my final year project on a LED dimmer circuit based on the
ambience in a room. This can be done using a LDR. However the circuitry of
has been a major stumbling block for me. My first circuit is a simple one where
the voltage input is connected in series with a resistor which is small(100 ohm) and a Load(which is the LED lamp). also the Load is parallel with
the LDR. With this configuration, when it is dark, the LED lamp brighten, and when bright it will dim. However the problems are:
1) The LED lamp will not dim until there is no light.
2) The LED lamp is not bright enough.
So my question are: 1) is there any other circuit which can be used
2) is there another way to vary the current into the LED
lamp ( as it is current driven), where it will be off when
there is really low current, and it can achieve
brightness in a dark room.
3) or should i vary voltage instead to dim the LED lamp
Specs: 12 volt power supply. 4 watts LED Lamp ( around 0.3mA to drive it),
LDR
Anyway, sorry if i don't post the image of the circuit. first time user. thx.
ambience in a room. This can be done using a LDR. However the circuitry of
has been a major stumbling block for me. My first circuit is a simple one where
the voltage input is connected in series with a resistor which is small(100 ohm) and a Load(which is the LED lamp). also the Load is parallel with
the LDR. With this configuration, when it is dark, the LED lamp brighten, and when bright it will dim. However the problems are:
1) The LED lamp will not dim until there is no light.
2) The LED lamp is not bright enough.
So my question are: 1) is there any other circuit which can be used
2) is there another way to vary the current into the LED
lamp ( as it is current driven), where it will be off when
there is really low current, and it can achieve
brightness in a dark room.
3) or should i vary voltage instead to dim the LED lamp
Specs: 12 volt power supply. 4 watts LED Lamp ( around 0.3mA to drive it),
LDR
Anyway, sorry if i don't post the image of the circuit. first time user. thx.