Download Sembicon-106-BiDirectional Annunciator

Annunciator System
Overview:
Annunciator is basically a system which is used to monitor and control different
industrial parameters like temperature, humidity etc in industrial development and
production systems.
The purposed system contains temperature, humidity sensors and their values
(readings) are displayed on the personal computer. The software running in personal
computer also has control button which is used to turn ON and OFF the parameter control
unit e.g. fan or heater for temperature.
Block Diagram:
Temperature
Sensor
ADC & Signal
Conditioning
Humidity Sensor
ADC & Signal
Conditioning
Preset
(Pot)
ADC & Signal
Conditioning
VB Software
(Personal Computer)
Power Supply
Microcontroller
Serial Communication
Relay
Relay Driver
Relay
Relay Driver
BiDirectional Annunciator
Working:
The system contains following modules;
1. Microcontroller
2. Sensors and signal conditioning circuit
3.
4.
5.
6.
Serial Communication
Personal computer with visual basic software
Relay and Relay Driver
Power Supply
1. Microcontroller
Microcontroller is the electronic device which contains processing
Power, memory and IO ports to interact with different connected devices. In this
system microcontroller is used to read the analog values of different sensors and
send to personal computer using RS232 communication protocol.
2. Sensors, ADC and signal conditioning circuit
In this system we are using temperature, and humidity sensors. Sensors are subject
to be changed according to application but the basic fundamental is the same for
any type of sensors since majority of the sensors are gives output as analog voltage
or variable resistor. Signal conditioning circuit is used to convert variable resistor into
voltage and amplification of incoming signal.
3. Serial communication
Serial interface is used for communication between PC and microcontroller. Serial
communication is widely used since its simple interface and range of distance that it
can handle.
4. Personal computer with visual basic software
The visual basic software running in personal computer shows the current values of
different sensors as temperature, humidity etc. User can see, analyze and
accordingly can ON/OFF the control devices like heater or cooling fan using button
provided in the GUI of visual basic software.
5. Relay and Relay Driver
Since microcontroller cannot provide sufficient power required to run the relay, relay
driver is introduced in the system. The relay driver circuit takes low power signal
(pulse) as input and gives high power as output. Hence it is used to drive the relay.
Relay is the electromechanical switch which is here driven by microcontroller via
relay driver IC.
6. Power supply
Every component system is required power supply which is +5 volts for
microcontroller and 9-12 volts for relay and its driver. This supply can be
provided from batteries.