We no longer make the IR-X10A board, so we're posting the full schematics showing you how to build an 8-channel infrared receiver circuit with the IR-X10A decoder IC. Full schematics for our original IR-X10A board are available for download below. A link to the order page for the IR-X10A decoder IC is also below. The really neat factor with this IR decoder IC is its ability to learn new Sony button codes. And you can control the decoder IC with most any off-the-shelf universal IR transmitter.
The heart
of the operation
The heart of the IRX-10A
is an 18-pin PIC16F627A microcontroller. The PIC is pre-programmed to decode Sony brand infrared transmitters.
The IRX-10A IC will work with most universal infrared transmitters capable
of transmitting standard 12-bit Sony®
TV or VCR key codes, providing remote control of eight digital outputs.
Learn mode provides a simple method for teaching the IRX-10A
new 12-bit Sony IR control keys. New control keys are learned in order,
starting from Relay #1 to Relay #4, then Digital Output #1 to Digital Output
#4.
Status LEDs by each output turn ON to indicate the IRX-10A is
learning the new key code for that particular output, and back OFF once the
new key code has been learned.
Key codes are stored in non-volatile EEPROM memory inside the
IRX-10A decoder IC, and will not be affected by a loss of power. The
internal EEPROM memory has a write cycle life expectancy of approximately
1,000,000 writes, so learning new key codes frequently is possible.
Restoring Factory Default Key Codes
To restore the factory default key codes used to control the
IRX-10A outputs, remove power from the IRX-10A board. Press & hold the learn
switch on the IRX-10A, and re-apply power. Hold the learn switch down until
the learn LED on the IRX-10A board begins to blink. Once the learn LED
begins to blink, release the learn switch. The pre-programmed default
factory key codes have now been restored, and the keys shown in table 1 of
the IRX-10A datasheet will now control the relay & digital outputs.
Latching &
Momentary Modes
As shown in the schematic, a 3-pin MODE selection header is provided for jumper
selection of momentary or latching modes. All relay & digital outputs
operate in the same mode, depending on the position of the shorting jumper
on the MODE selection header.
In the L position all relay & digital outputs operate in
latch mode. Latch mode allows the user to toggle the relay contacts open &
closed, and digital outputs ON & OFF with each key press from the IR
transmitter. Simply press & release a transmitter key to toggle the state of
a relay contact or digital output.
In the M position relay contacts & digital outputs operate in
momentary mode. In momentary mode, relay contacts will remain closed, and
digital outputs will remain ON until the infrared transmitter key that
controls the relay or digital output is released.
Releasing the key on the IR transmitter opens the
corresponding relay contact or turns OFF the digital output controlled by
the key being pressed.
LED Status Indicators
LEDs are provided for a visual status of each relay, and
digital control output ON and OFF state.
A relay status LED is ON when the relay contacts are closed,
and OFF when the relay contacts are open. A digital outputs status LED is ON
when the digital output is active, and OFF when the digital output is
inactive.
The LED labeled P-Key provides a visual indication that a
“power” or control key code is being received. Power keys are IR transmitter
key codes that will control the relay & digital outputs. The LED
labeled V-Key provides a visual indication that a compatible 12-bit Sony IR
transmitter key code is being received. This LED will be ON while receiving
any valid 12-bit Sony key code.
Schematics The schematic to build
the IRX-10A circuit is quite large, so we're making it available in Adobe .PDF
format for download HERE.
Download the IRX-10A datasheet
HERE to see how the decoder IC works in an actual circuit. Purchase Parts We have the IRX-10A IR decoder IC's HERE. Click HERE For
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