K92.
IR Remote Control & Decoder IC
This Kit uses a commercial 14-pin remote control unit to put an active low signal onto one of 14
pins on a decoder IC. That is, when a RC button is pressed, the pin corresponding to that button on
the decoder IC goes low. Normally, each of the 14 output pins is high. It is up to the user to use this
information in their own circuit where remote control is required. For example, to control up to 14
relays or to control the movement of a robot. We supply all the necessary extra components
required for the decoder IC to function properly. No PCB is supplied. It is up to the user to
breadboard their application then make their own PCB. A sample application/test circuit is
provided. A 330Ω resistor & LED are supplied for testing the active low on a pin in response to a
button press.
We supply three sets of components:
1. a 14 button Infra Red Remote Control unit. It just needs you to add 2 x AAA batteries.
2. a 3-pin Infrared Receiver Module, the Waitrony PIC1018SCL which converts the modulated
38kHz signal into data pulses.
3. an Atmel 89C2051-24PC microcontroller which we have preprogrammed to decode the IR data
pulses from the remote control into one of 14 active low outputs. All required components for
the microcontroller are supplied – a 12MHz ceramic resonator for the oscillator, resistor,
capacitor and diode for the power-on reset circuit plus two 10K pullup resistors (see below).
CIRCUIT DESCRIPTION
The remote control unit sends out a 38KHz signal modulated with data pulses for the particular
button pressed. The infrared receiver module removes the 38KHz signal and outputs the data pulse
stream. This is fed into the microcontroller where it is decoded by onboard firmware and one of the
fourteen ouputs will go low. The microcontroller outputs are normally held high by internal pullups
except for pins 12 and 13 which require external pullup resistors (10K).
DECODER IC PINOUTS
The following table lists each pin function.
Pin Description Pin Description
1 RESET, active high 20 VCC (+5V)
2 Output 14, BUTTON 14 19 Output 1, BUTTON 1
3 Output 13, BUTTON 13 18 Output 2, BUTTON 2
4 Ceramic resonator 17 Output 3, BUTTON 3
5 Ceramic resonator 16 Output 4, BUTTON 4
6 Data input (from IR receiver module) 15 Output 5, BUTTON 5
7 Output 12, BUTTON 12 14 Output 6, BUTTON 6
8 Output 11, BUTTON 11 13 Output 7, BUTTON 7
8 Output 10, BUTTON 10 12 Output 8, BUTTON 8
10 GND 11 Output 9, BUTTON 9
COMPONENTS
330R resistor 1/4W 1 See our website at http://kitsrus.com
10K resistors 1/4W 4
5mm LED 1 Email us at peter@kitsrus.com if you have any questions. Yes,
1N4148 diode 1 we will supply any extra components you wish. Just email us. The
10uF/25V mini ecap 1 code inside the decoder IC is locked and is not available.
12MHz ceramic res. 1
AT89C2051 IC 1
IR Receiver module 1
27pF ceramic caps 2
IR Remote Control 1
K92. IR Remote Control & Decoder IC
