This is a design circuit that can be used for monitoring the status of roof equipment. This circuit is work with based on LM324 for controller the circuit. This is the figure of the circuit.
The circuit works as follows: with the switch open (e.g., TV antenna parked) input pin 2 is high so output pin 1 is low compared to the mid voltage at input pin 3. So input pin 6 is low and thus output pin 7 is high and the green LED lights. When the switch is closed (the antenna is up) input pin 2 is low so output pin 1 is high, input pin 6 is high and output pin 7 is low and the red LED lights. Power consumption is ~18.3 mA green, 19.0 mA red. Only one circuit includes the divider string of resistors. All others use that mid voltage reference. And the circuit for the roof vents has the LED reversed since the switch is closed when the vents are closed. The fourth circuit and LED are unused so far.
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