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Step 4Run a Relay Race
An independent SPST reed relay is tied to each PIR sensor. An electrolytic capacitor and diode help to smooth the on/off operation of each relay by reducing "chatter" on the PIR sensor control lines.
Each relay is also tied to one of the electric motors inside the tank.
The tank kit's remote control box is used for housing the completed relay circuit board along with the motors' battery pack.
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