Arduino battery backup with battery level and ac power indicator

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04:34:56

Automatically switches to a 9v battery on power loss. The 7 segment shows a power level of 5-0 as the battery voltage drops from 9-4 volts. The dot on the 7 segment shows when the main power supply is active.

The voltage source on the left represents a 9v battery and you can see how it operates by changing its voltage. The supply on the right represents a 12v main supply.

published 8 years ago

BillyT

8 years ago

This circuit is great and a has inspired me to try and find another way of doing it, here is one of the circuits that came out of that challenge. http://everycircuit.com/circuit/6362049860337664

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