Intro: LDR Outdoor LED Light Controller Under 450INR
Its Light dependent outdoor Light activation with integrated OFF timer running on 8 pin AVR tiny13.
It uses the cheap internal unregulated SMPS DC power source. in my case with no load the DC source was going high up to 44V~50V and with LED ON its around 28V~32V. and 5.1V reference is generated using D2(1/4W) and R3(1W) network.
Step 1: PCB Assembly
its very simple assembly, I have assembled on a general purpose board with some jumper wires.
Step 2: Flashing the Firmware to ATTiny13a
Download the firmware HEX file from https://github.com/123swk123/Outdoor_Light_Controller
and set the fuses as per the fuse image shown
Step 3: Inside the LED Assembly Housing
make sure LED does not picks up its own LED ON/OFF luminescence change I have used heat shrinking tube to minimize that also in the firmware has logic to ignore the self feedback of luminescence change.
Step 4: PS: Additional Trick
As a Timer:
removing the LDR will just convert this system to behave as a normal digital off timer(2hrs ~ 12hrs).