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K EE L OQ? 3 DEVELOPMENT KIT
USER ’S GUIDE
Chapter 7. K EE L OQ? Development Kit PIC16F636 Transmitter
7.1
7.2
7.3
INTRODUCTION
The K EE L OQ? 3 Development Kit PIC16F636 transmitter is a SAW-based, short range,
low-cost OOK (on-off keying) transmitter. The K EE L OQ encoding is done on the
PIC16F636 microcontroller. The PIC16F636 features an internal K EE L OQ encryption
peripheral, which eases encoding code development. All encoder data is stored in the
PIC16F636 internal EEPROM.
HIGHLIGHTS
This chapter discusses:
? Main features of the PIC16F636 transmitter
? K EE L OQ software encoder source code
MAIN FEATURES
The PIC16F636 transmitter is a software-based device. The K EE L OQ encoder source
code is available under the K EE L OQ encoder license. Thus, the user has complete
freedom in designing their own custom solution. While the kit comes with specific
software, there is basically no limitation in modifying the source code to create custom
encoding schemes.
In addition, the PIC16F636 based transmitter can support an 8 or 14-pin socket for use
with code development with other PIC ? devices. The four buttons (S0... S3) on the
transmitter are connected to input pins on the microcontroller. The user may activate
any combination of buttons transmitting any of the 15 possible function codes.
Header J2 (unpopulated) can be used for further development or for additional function
codes for XTEA and AES encoding protocols.
The battery holder accepts one CR2032 3V lithium battery, positive side up. The RF
oscillator circuit is designed to operate at this voltage.
Some of the features of the software-based PIC16F636 K EE L OQ encoder are:
?
?
?
?
?
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Two programmable 32-bit serial numbers
Two programmable 64-bit crypt keys
Two programmable 60-bit seed values
Four button inputs
Four selectable baud rates
PWM, VPWM, PPM and Manchester modulation
The included CD also contains software for a K EE L OQ /XTEA and K EE L OQ /AES
encoder, which include a larger serial number and crypt keys. All other functionality
remains the same.
? 2009 Microchip Technology Inc.
DS41378A-page 35
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