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Servo controlled infrared transmitter
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Application examples:
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- Remote control for a camera on a RC-model through normal servo channels.
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- Control for a TV at home. Doorbell connected to one input - switches the TV to a surveillance cam.
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- Control for a stereo at home. Motion sensor connected to one input - pump up the volume to scare a housebreaker.
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The idea for this project came up, to control a HD-camcorder on a Mikrokopter with a second radio-transmitter.
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Gas-Stick: Zooming Camera
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3-way Switch: Stop/Picture/Movie record
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Nick-Stick: Cameraholder-Nick
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Roll-Stick: Cameraholder-Roll
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Inputs:
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2 channels for servo-signals, switches or other TTL signals
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1 IR-Receiver to learn new codes (36 - 40 kHz)
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Output:
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Modulated infrared signal at 950 nm
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Controls:
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1 LED to indicate several operating modes
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1 button to enter/leave the learning mode and switch between single and multi mode
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Supply voltage:
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5V DC @ 50 mA
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(Attention when using RC-Receivers with higher voltage)
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Theory of operation:
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Each channel is seperated into 5 states, depending on the positive pulse width:
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0,00 - 0,74 ms => 0 (switch to GND)
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0,75 - 1,24 ms => 1 (stick down)
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1,25 - 1,74 ms => 2 (stick middle)
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1,75 - 2,24 ms => 3 (stick up)
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2,25 - more ms => 4 (switch to VCC or open input)
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Together with the second input, you get theoretically 25 different combinations, which all can be populated with learned IR-code.
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When using servo signals only, you have 3 states per channel, so 9 combinations.
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When using switch signals only, you have 2 states per channel, so 4 combinations.
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When mixing both signals, you have 2 states for the switch and 3 states for the servo, so 6 combinations.
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When using only one channel, you get 2 (switch) or 3 (servo) states.
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After power-up, the device checks the inputs the whole time. When a combination was learned with an IR-Code before, this code is sent out through the IR-Diode. Depending on which mode this combination was learned, it is sent out only once (single-mode), or as long as the combination stays active (multi-mode).
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When the device sends out IR-Code, the red LED lights up.
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Theory of learning:
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When you press the button on the device, it goes to learning-mode.
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In this mode, the LED flashes 1 or 2 times (depending of the actual mode) every half second, indicating that the device is waiting for IR-codes.
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When pressing the button again, you can choose between single- or multi-mode.
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When an IR-code is sent to the device, it looks at which state-combination the inputs are, and saves the IR-code for this combination.
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Saving is confirmed with fast flashing of the LED.
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You can now learn multiple combinations with different (or same) IR-codes, you can even mix up different IR-protocols and use different modes on different combinations.
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When you have learned enough, press the button for 2 seconds, to permanently save the data to the EEPROM. This is confirmed with fast LED-flashing.
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The device goes back to normal operation and is ready for orders.
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Currently supported IR-Protocols
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Protocol:   Used by
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===================
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GRUNDIG     Grundig
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JVC         JVC
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KASEIKYO    Panasonic, Technics, Denon and more japanese manufacturer, which are member in "Japan's Association for Electric Home Application"
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NEC         NEC, Yamaha, Canon, Tevion, Harman/Kardon, Hitachi, JVC, Pioneer, Toshiba, Xoro, Orion, NoName and much more japanese manufacturer
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NIKON       Nikon
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RC5         Philips and more european manufacturer
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RECS80      Philips, Nokia, Thomson, Nordmende, Telefunken, Saba, Technisat
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SAMSUNG     Samsung
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SIRCS       Sony
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The code was compiled using WinAVR-20081205. Other versions generate much bigger code which don't fit in the ATMega8 anymore. To avoid this, use another WinAVR version or disable some IR-protocols in irmpconfig.h and irsndconfig.h
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This project is based on the nice IR decoder/encoder routines (IRMP/IRSND) from Frank Meyer => http://www.mikrocontroller.net/articles/IRMP