Remote-Controlled Door LockECE 345 Design ProjectZack Morris & Paul Cheng4/29/99

IntroductionObjective: To design a receiver -transmitter pair that would allow us to open doors remotely with the following specifications:

Use Minimal Size Transmitter Low Stand-by Power High Security Mechanism Low Range of Transmission Programmable Code

Original DesignTransmitterReceiver

Assembly of CircuitHoltek Decoder/EncoderParallel-Serial-Parallel, Resistor ValuesLinx ModulesSoldering & Antenna AttachmentDoor Lock (Solenoid Assembly)Relay, Bolts, Springs & Mounting

Final Design

Functional TestsEncoder/Decoder Frequency Mismatch1/16th SamplingTransmission InterferenceDoor Lock Open TimeTransmitter/Receiver OrientationTransmitter Voltage Test Dip Switch Combination Test

Power ConsumptionReceiver Stand-by Power ~ 1.5 W (Circuit) + ~ 12 W (Power Supply)Transmission Power~ 65 mW

Problems EncounteredCalibrating the Encoder/DecoderTesting While Others TransmittedMechanical Difficulties of the SolenoidSpring Assembly

RecommendationsUse Rod Actuator Instead of SolenoidManual Lock/Unlock with KeyRolling CodeROM, Random Sequence GeneratorUse Solder Board Instead of ProtoboardFilter Integration