Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to control an AC bulb using a PIR sensor, a relay, and a transistor. The circuit converts AC to DC using an AC to DC converter and uses a PIR sensor to detect motion, which then triggers a relay through a transistor to turn on the AC bulb.

Component List

1. PIR Sensor

   • Pins: VDD, SIG, GND
   • Description: Passive Infrared Sensor used to detect motion.
   • Purpose in Circuit: Detects motion and sends a signal to the transistor.

2. KF-301 Relay

   • Pins: signal, power, ground, NC, C, NO
   • Description: Electromechanical relay.
   • Purpose in Circuit: Controls the AC bulb based on the signal received from the transistor.

3. BC547 Transistor

   • Pins: Collector, Base, Emitter
   • Description: NPN Bipolar Junction Transistor.
   • Purpose in Circuit: Acts as a switch to control the relay based on the signal from the PIR sensor.

4. AC to DC Converter (actodc)

   • Pins: 12v, -, 5v, live, neutral
   • Description: Converts AC voltage to DC voltage.
   • Purpose in Circuit: Provides the necessary DC power for the PIR sensor, relay, and transistor.

5. AC Source

   • Pins: +, -
   • Description: AC power supply.
   • Purpose in Circuit: Provides AC power to the AC to DC converter and the AC bulb.

6. AC Bulb

   • Pins: P, N
   • Description: Standard AC light bulb.
   • Purpose in Circuit: Illuminates when the relay is activated.

Wiring Details

PIR Sensor

• VDD is connected to the 5v pin of the AC to DC Converter.
• SIG is connected to the Base pin of the BC547 Transistor.
• GND is connected to the - pin of the AC to DC Converter.

KF-301 Relay

• power is connected to the 5v pin of the AC to DC Converter.
• ground is connected to the - pin of the AC to DC Converter.
• signal is connected to the Collector pin of the BC547 Transistor.
• C is connected to the P pin of the AC Bulb.
• NO is connected to the live pin of the AC to DC Converter.
• NO is also connected to the + pin of the AC Source.

BC547 Transistor

• Base is connected to the SIG pin of the PIR Sensor.
• Collector is connected to the signal pin of the KF-301 Relay.
• Emitter is connected to the - pin of the AC to DC Converter.

AC to DC Converter (actodc)

• 5v is connected to the VDD pin of the PIR Sensor and the power pin of the KF-301 Relay.
• - is connected to the GND pin of the PIR Sensor, the ground pin of the KF-301 Relay, and the Emitter pin of the BC547 Transistor.
• live is connected to the NO pin of the KF-301 Relay and the + pin of the AC Source.
• neutral is connected to the N pin of the AC Bulb and the - pin of the AC Source.

AC Source

• + is connected to the live pin of the AC to DC Converter and the NO pin of the KF-301 Relay.
• - is connected to the neutral pin of the AC to DC Converter and the N pin of the AC Bulb.

AC Bulb

• P is connected to the C pin of the KF-301 Relay.
• N is connected to the neutral pin of the AC to DC Converter and the - pin of the AC Source.

Code

There is no microcontroller code provided for this circuit.