Afc ppt


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Automatic Flushing Control..!!!

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Afc ppt

  1. 1. Page 1
  2. 2. OVERVIEW Today, manual flush In manual flush systems have beensystems, the user presses a replaced with abutton, which opens a flush sensor-operated system valve allowing mains- that automatically flushes pressure water to flow into the fixture when the user the bowl, or sometimes the departs. Theuser presses directly a flush microcontroller-based lever (a handle connected automatic flush systemto a flushometer). The valve presented here uses an contains a pneumatic infrared sensor to detect a mechanism that closes it user approaching the after a preset time. fixture, then it waits until the user departs. Page 2
  3. 3. CONTd. A solenoid is used to actuate the flush from Installation of a 6V power supply with battery backup inside this the unit that also microcontroller powers the sensor circuit. This flush based automatic system is fully flush system is controlled by a shown in Fig. microcontroller. It also flushes before the person departs if the person is present for more than the preset time (more than 5 minutes). Page 3
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  5. 5. contd. The IR transmitter LED and the IR receiver modules are mounted side by side such that when the user approaches the mechanism, the IR receiver A solenoid operated module receives the water valve is used in IR signal reflected off the system. the person. Page 5
  6. 6. Circuit description: The AT89C2051 is an 8-bit microcontroller with It is built around 2 kB of flash based Below shows the Atmel 89C2051 program circuit of the microcontroller that memory,128 bytesmicrocontroller-bas controls the of RAM, 15 ed flush control process of input/output system. automatically lines, two 16-bit flushing the toilet. timers/counters, on- chip oscillator and clock circuitry. Page 6
  7. 7. Page 7circuit of the microcontroller-based flush control system.
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  9. 9. CONTD. A 6MHz crystal is used for providing clock. Port pins P1.0 All the input/output (I/O) pins arethrough P1.4 of the microcontroller reset to ‘1’ as soon as RST (pin 9) are connected to buffers N1 goes high on pressing switch S3.through N5 of CD4050 via 10-kilo-ohm pull-up resistors, respectively. Page 9
  10. 10. Contd. Holding the RST pin high for two machine cycles while the oscillator is running resets the device. Power-on reset is achieved by capacitor C2 and resistor R9.Resistor R10 limits the current Pin 12 (P1.0) of microcontroller IC2 through the LEDs. Port pins provides the 38kHz clockP1.1, P1.2, P1.3 and P1.4 are frequency, which is buffered by N1 used for indication of to drive the two parallel IR-LEDs. standby, alert, active and These IR-LEDs act as the infrared flush, respectively. signal transmitter. Page 10
  11. 11. Contd. Port pin P1.4 also drives relay RL1 through transistor T1. Diode D5 acts as a free-wheeling diode. INT0 (pin 6) of the The solenoid coil microcontroller is operated off 6V is pulled up with resistor connected to the R3 and connected to contacts of relay RL1. pin 3 of TSOP1738 IR receiver module. External interrupt 0 (INT0) is used to receive the reflected IR signal. Page 11
  12. 12. Contd. Pin 2 of TSOP1738 is pulled high with resistor R2, while pin 1 is grounded. In the IR receiver module TSOP1738, the PIN diode The demodulated output and the preamplifier are from the receiver module assembled on the lead can be directly decoded by frame, and the epoxy the microcontroller. package is designed as an IR filter. Page 12
  13. 13. Contd. An actual-size,single-side PCB forthe microcontroller- based automatic flush system isshown in Fig. belowwith its component layout. Page 13
  14. 14. Pcb & its component layout Page 14
  15. 15. The software: The software for flush First, instruct the compiler to system is written in ‘Basic’ use 89C2051.dat for language and compiled microcontroller AT89C2051using Bascom-8051 version. by statement ‘$regfile.’• Which we have used here, is a demo version of Bascom-8051. Page 15
  16. 16. Contd. Then declare the After this, instruct variables as the compiler to bits, bytes and override the words. Initialize crystal frequency port-1 to ‘0’ and options setting by port 3 to ‘1.’ statement (Port-3 acts as ‘$crystal.’ T the input port.) Now write the subroutine ‘Fn38K6’ to Enable the generate 38kHz interrupt after frequency for initialization. transmission of the IR signal. Page 16
  17. 17. Contd. Standby LED When ‘INT0’ goes When the person glows when low, i.e., the moves away (noexternal interrupt transmission is interrupt) within 5 ‘INT0’ is interrupted, alert minutes, thehigh, i.e., there is LED glows. After system flushes forno interruption of 5 seconds, active 10 seconds.IR transmission. LED lights up. Page 17
  18. 18. http://www.mcselec.c om/index.php?option =com_content&task= view&id=190&Itemid =57reference Page 18
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