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The lamp positive (tleft) is the VIN on the Arduino, (accepts up to 12v and requires a minimal of 3.3v probably, ideal 5v or to 12v) and lamp negative (right) is to its ground. The 9v's on the left are rechargeable (Energizer NiCd) 9v batteries, changing the volts lower shows the circuit refill, each switch near them simulates removing a battery (longer course of replacing even if power is out). The 10v on the right is a outlet adapter AC 120VAC to DC 10v. The switch on the right simulates power outage. The 10v on the left represents small solar panels, I'm using two 5v solar panels in serial for testing. Or you may say it's night time and turn down the left 10v to near zero, and cut the power with the right switch, then drain a battery or few by turning down the 9v to nearer zero and then the sun comes up, turn the 10v back up and hopefully the power was on already switched. (same project with out the solar junction: https://everycircuit.com/circuit/5802126037745664). Non zener diodes I'm using are 1N4007 - nforystek
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