Fyp2 - Week 8

RF Transmitter (315MHz)

- Capable transmit signal up to 100 meters range   around the open area

- Wide input supply (2.5-12V)

- Small dimension

- ASK Modulation

This low cost RF transmitter can be used to transmit signal up to 100 meters (the antenna design, working environment and supply voltage will seriously impact

the effective distance). It is good for short distance, battery power device development.

It has benefits of:

• Wide input supply (2.5V-12V)

• Easy to integrate (Data, Vcc and GND)

• Device in deep sleep mode when Data pin is grounded

• Very small dimension

RF Receiver (315MHz)

- Super regeneration design ensures sensitive to weak signal

- Low power consumption (4mA)

- Small dimension

This low cost RF Receiver can be used to receive RF signal from any 315MHz transmitter. Super regeneration design ensure sensitive to weak signal.

It has benefits of:

• Low power consumption (4mA)

• Easy to integrate (Vcc, GND and Data)

• Super regeneration design

• Very small dimension

Fyp2 - Week 7

RELAY DRIVER

• C547 transistor used as a switch for controlling the operation of the relay
• If there is voltage at the transistor base> 0.7V the transistor will be in the "ON"
• Current flows from the resistor, transistor base to ground.
• 12V current flow from the source to the collectors of transistors and thus to ground will cause the resulting magnetic field at which the relay coil's magnetic field will attract the "contact relay" from the "Normally close (NC @ OFF) to position" Normally open "(NO @ ON).
• If the voltage at the transistor base <0.7V the transistor will be in the off state. There is no current flow from the collectors of transistors to ground causes the relay Normally positioned close @ off

Fyp2 - Week 6

Buy components for the control box.