Light sensor input fed through an LM339N comparator
Light sensor fed through an LM339 comparator
Light sensor notes
Brown wire is soldered to the power button. The red wire is soldered to the power pin on the VGA output and let's the circuit know when the computer is turned on.
Daylight power circuit version 0.
Daylight power circuit version 0
Adding a timer to keep the circuit from 'hot clicking' the EEEpc's power button.
Adds a timer to keep the circuit from 'hot-clicking' the EEEpc's power button: 220uF cap, 56K resistor and 2N4400 NPN transistor.
Adds a timer to keep the circuit from 'hot-clicking' the EEEpc's power button. Making more rooom on the breadboard.
Final circuit soldered onto a board in an enclosure
Final circuit with power supply mounted outside the case. Light sensor left; output to computer power button top; computer power state input bottom. Left LED indicates sun is up, right LED indicates computer is turned on.
I hacked this exterior electrical box to make a weatherproof container for my webcam
I had to take the webcam out of its case to fit in the weatherproof enclosure.
My daughter came up with the idea to use popsicle sticks to mount the camera in the box. It worked very well.
The solar panel is mounted on the cedar pole about 8' off the ground.
At the base of the tree is the metal box my Dad donated to the project. That's where I put all the electronics to keep them dry.
Here's the skeleton of the stand I built for the metal box and the web cam.
Here's the final result. You can see the webcam in its little enclosure above the metal box. At the top of the Cedar pole are the weather instruments: rain guage, wind direction and anemometer. The temperature guage is mounted above the metal box where it remains shaded.
Looking inside the metal box you can see the deep cycle battery, charge controller, power supply, and the computer with the custom circuit to turn on/off the computer when the sun is not out. On the right is the weather station.