transistor, a 1N4007 diode, relay switch and a ready-made PIR sensor module. The operating voltage of the circuit is 12V DC but it can also be operated with lower voltages for example 5V or 6V DC. For operating the circuit with 5V or 6V DC the relay value and PIR module operating voltage must match the operating voltage. 
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With this simple motion sensor circuit you can change your home doorbell into completely automatic doorbell that will activate automatically when a visitor come near to your door. The circuit is using very few parts, which can be easily purchased from your local electronic store; the parts are one 2N4401
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Simple Motion Sensor Doorbell Circuit Diagram