1. REMOTE JAMMING DEVICE

2. Introduction
Using this project we can jam the emerging TV Remote signals on reaching the IR Receiver at the TV end.
We send higher strength modulated 38 KHz signal that a normal TV Remote delivers, generated through a 555 Timer in astable mode so that we can jam or stop the TV Remote signals reaching the TV Receiver.

3. EMBEDDED SYSTEMS Definition for :- EMBEDDED SYSTEMS
A combination of hardware and software which together
form a component of a larger machine.
An example of an embedded system is a microprocessor that
controls an automobile engine.
An embedded system is designed to run on its own without
human intervention, and may be required to respond to
events in real time.

4. EMBEDDED SYSTEMS

5. Contents Introduction Block diagram Hardware requirements Power supply
555 TIMER
IR DIODE
Schematic diagram
Working of the project
Advantages
Applications
Conclusion

6. 2.BLOCK DIAGRAM
Power
Supply
C555
IR TRANSMITTER

7. Hardware requirements
BC547
RESISTOR
CAPACITOR
555 TIMER
IR DIODE

8. BC547 (NPN –Transistor)
The BC547 transistor is an NPN Epitaxial Silicon Transistor.
It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors.
The ratio of two currents (Ic/Ib) is called the DC Current Gain of the device and is given the symbol of hfe or nowadays Beta, (β).

9. The current gain from the emitter to the collector terminal, Ic/Ie, is called Alpha, (α), and is a function of the transistor itself

10. IR LED
An IR LED, also known as IR transmitter, is a special purpose LED that transmits infrared rays in the range of 760 nm wavelength.
They, along with IR receivers, are commonly used as sensors.

11. 555 TIMER
The 555 Timer IC is an integrated circuit (chip) implementing a variety of timer and multivibrator applications
The 555 has three operating modes:
Monostable mode: in this mode, the 555 functions as a "one-shot". Applications include timers, missing pulse detection, switches, touch switches, frequency divider, capacitance measurement, pulse-width modulation (PWM) etc.
Astable - free running mode: the 555 can operate as an oscillator. Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse position modulation, etc.
Bistable mode or Schmitt trigger: the 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used. Uses include bounce free latched switches, etc.

12. Internal architecture of 555 timer
Pin
Name
Purpose 1
GND
Ground, low level (0 V) 2
TRIG
OUT rises, and interval starts, when this input falls below 1/3 VCC. 3
OUT
This output is driven to +VCC or GND. 4
RESET
A timing interval may be interrupted by driving this input to GND. 5
CTRL
"Control" access to the internal voltage divider (by default, 2/3 VCC). 6
THR
The interval ends when the voltage at THR is greater than at CTRL. 7
DIS
Open collector output; may discharge a capacitor between intervals. 8
V+, VCC
Positive supply voltage is usually between 3 and 15 V.