Thanks for response, the details which you asked are as such ,
1. solar charger circuit to charge a lead acid battery.
2. my project demands that in a room if someone is present then LED's should be always on.
3. if the natural light is gud then it should dim its light .
4. if nobody is there in room then after a delay of 1-2 min it should switch off.
5. provision to shut down during holidays.
All i need is my department room during college hour or after if needed should be lighted with using solar energy directly or through batteries.
I am really counting on you , I DON'T HAVE ANYONE WHO CAN TEACH ME THIS AND I GOOGLED IT LOT BUT ITS NOT WORKING OUT.
AS per the request the following energy saving intelligent light circuit consists of three separate stages, viz: the PIR sensor stage, the LED module stage, and the PWM light controller stage consisting of a couple of IC555.
Let's understand the the different stages with the following points:
The upper stage consisting of the PIR sensor module, and the associated circuit forms a standard passive infrared sensor stage. In the presence of humans in the specified range, the sensor detects it and it's internal circuitry converts it to a potential difference so that it's fed to the base of the first NPN transistor.
The above trigger, activate both the transistors, which in turn switch ON the LEDs connected at the collector of the TIP127.
The above stage makes sure that the lights are ON only during the presence of humans in the vicinity, and are switched OFF when there's nobody around. C5 ensures the lights don't switch OFF immediately in the absence of humans rather after a few seconds of delay.
Next, we see two IC 555 stages which are configured as standard astable and PWM generator stages. C1 determines the frequency of the PWM, while the R1 resistor may be used for optimizing the correct response from the circuit.
The PWM output is fed to the base of TIP127 transistor. This means, when the PWM pulses consist wider pulses, keeps the transistor switched OFF for greater periods of time, and vice versa.
It implies, with wider PWMs, the LED would be weaker with their intensity, and vice versa.