Featured Post

High CMRR Instrumentation Amplifier (Schematic and Layout) design for biomedical applications

on
Instrumentation amplifiers are intended to be used whenever acquisition of a useful signal is difficult. IA’s must have extremely high input impedances because source impedances may be high and/or unbalanced. bias and offset currents are low and relatively stable so that the source impedance need not be constant. Balanced differential inputs are provided so that the signal source may be referenced to any reasonable level independent of the IA output load reference. Common mode rejection, a measure of input balance, is very high so that noise pickup and ground drops, characteristic of remote sensor applications, are minimized.Care is taken to provide high, well characterized stability of critical parameters under varying conditions, such as changing temperatures and supply voltages. Finally, all components that are critical to the performance of the IA are internal to the device. The precision of an IA is provided at the expense of flexibility. By committing to the one specific task of
2

Automatic Train Gate controlling / Metro Train Indication

on
This Embedded System is designed to control the  train junction Gates automatically when train passes across this junction. Here we arrange two IR sensors before the junction ( distance > 500mtrs from Gate junction) and also two IR sensors after the junction (distance  > 500mtrs from Gate junction). The IR sensors which are before the junction will indicate that the train is coming near to the junction and the IR sensors which are after the junction will indicate that the train has passed away the junction.
The pictorial arrangement of the system is shown here
                       

when train comes in between the 2 IR sensors the output of both the photodetectors will become logic - '1'. Then the system will send logic high to the Siren, Red light will glow , green light will turn off and the Gate will close. 
Here is the simple flow chart showing its operation

           
                               

Case'1': When train is coming near to the junction
 to see the video output
  to download the C-code                                                     Servo Motor
    
Case '2': When train passed away the junction
                       

NOTE: 
Here we  connected single servo motor b'coz it is a prototype. but in real time we will use two servo motors, and also here the Siren is replaced by Yellow color LED and IR sensors are replaced by optocouplers.

Comments

Post a Comment