Irlc computer controlling circuit

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Linux infrared remote control

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Irlc computer controlling circuit

  1. 1. 2010 by stormCommunications projectlirc = Linux infraredremote control
  2. 2. Part of presentation Introduction Component Facedto the project and criteria problems lirc
  3. 3. INTRODUCTION TO THEPROJECT lirc
  4. 4. Getting Started introduction lirc => Linux infrared remote control Serial Port Receivers reference http://www.lirc.org/receivers.html
  5. 5. Use remote !Use remote to send an IR signal and receive itin designed circuit and the control any thingin computer by a software .
  6. 6. COMPONENT ANDCRITERIA lirc
  7. 7. Components ! C1 - 4.7µF capacitor
  8. 8. Components ! D1 - 1N4148 diode
  9. 9. Components ! R1 - 4k7 resistor (4.7 kOhm)
  10. 10. Components ! IC2 - 78L05, 100mA, voltage regulator (TO-92 casing)
  11. 11. Components ! 9-pin or 25-pin SUB-D socket
  12. 12. Components ! Tsop 1738
  13. 13. Criteria You should choose the 38 kHz carrier frequency types because most remote control standards use this frequency. What happened if we use receiver with lower frequency ? The receiver wont stop working if your remote uses another frequency but the range will decrease.
  14. 14. Criteria The pin-out of the voltage regulator usually looks like this (front view) The pin-out of the tosp receiver usually looks like this (front view) 1,2,3 from left
  15. 15. Criteria Serial port distribution looks like this
  16. 16. Criteria The circuit of all receiver
  17. 17. CriteriaThe power for the circuit comes from the RTS (request to send )line of the serial port. D1 protects the circuit from the negativevoltage that is usually on the RTS pin. The LIRC driver will changethe serial port settings on initialization so that the circuit will getthe necessary positive voltage. For most standard PC serial portsthis will be approximately 10V. IC2 will convert the input voltageto exactly 5V.
  18. 18. Criteria C1 is optional but for safety. R1 is a pull-up that makes sure the DCD (Data carrier detect) line is on a valid voltage level if the receiver does not receive anything.
  19. 19. Criteria When an infrared signal is detected pulls DCD (Data carrier detect) down to ground, which should already be interpreted as a logical "1" (DCD=0) by the serial port.
  20. 20. Faced problems lirc
  21. 21. Faced problems 1* Due to low voltage in serial port that (6V or even less) out from regulator 2v this circuit probably wont work on some notebooks So you should make sure that your serial port delivers at least 8V of output voltage
  22. 22. SolutionIf your serial port provides less you can also tryusing a low-drop voltage regulator (e.g. LP 2950CZ) instead of the regulator suggested here
  23. 23. Faced problems 2 * we cant use USB to serial converter the USB port or the internal 5V line to power the circuit.
  24. 24. Then you wont need a voltage regulator at all.

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