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Creating a simple device that tells you when your dishwasher has been run

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jesuscf:
If an electro-mechanical solution is the only option, an small DC motor with a lever may work.  Below is the circuit.  The idea is that over time the capacitor is discharged via the 10k \$\Omega\$ resistor.  When the thermostat closes, the capacitor starts charging behaving like a short circuit for a short time.  This causes the small DC motor to move a little bit, moving the lever in one direction.  To reset, just move the lever to the other position.  The circuit may even work without the resistor, or a resistor with bigger resistance.  That would allow the batteries last for a very long time.

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I don't have a thermostat, so I am simulating its operation by touching one terminal of the DC motor with the capacitor.  Here is the circuit with the lever to one side.



When I manually connect the capacitor to the motor, the lever moves.  The capacitor charges quickly so the motor moves for a short time.



Of course, when the thermostat opens again, the lever remains in its last position.


langwadt:
put in some dirty dishes. Later when you check them, if they are clean dishwasher has been run ;)

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