arduino-pocsag

Arduino based POCSAG decoder using the frequency shift keying demodulator on Motorola pager RF boards.

Tested successfully with up to 1200 baud POCSAG.

Designed for Arduino Mega2560 and optional DS3231 RTC

Sample output:

Wiring:

pin	used for
19	Input from RF Receiver Board
20	DS3231 SCA
21	DS3231 SCL
8	LED Preamble detected
9	LED SYNC word detected
10	LED for codeword errors
11	LED for field strength alarm

To receive decoded messages, connect it to a terminal with 115200 baud.

To show configuration help, type "h" in a serial terminal:

command	used for
c0	Real Time Clock disabled / not installed
c1	Real Time Clock enabled
d0	Debug Output OFF
d1	Debug Output LOW (show statistic summary after decoding)
d2	Debug Output MAX (prints all received codewords)
e0	Error Correction disabled
e1	Error Correction 1 Bit Errors
e2	Error Correction 2 Bit Errors
e3	Error Correction >2 Bit Errors (experimental)
l0	LEDs disabled
l1	LEDs enabled
i0	Input normal
i1	Input inverted (used for LX4 receiver board!)
p0	Parity Check disabled
p1	Parity Check enabled
u0	Umlaut-Replace disabled
u1	Umlaut-Replace enabled
ft n	Field Strength Alarm (n minutes; 0 = off)
me n	max. number (n) of allowed codewords with incorrectable errors
rics x - y	RIC-Filter. Message output only from RIC x to RIC y; set both to 0 to disable filter
time dd.mm.yyyy hh:mm:ss	set time
time	prints current rtc time

Debug output d2 (MAX) :
cw[0] = 2181040895; // (1) *

• codeword 1 (zero based index!) has the value 10000010000000000000101011111111 (decimal converted 2181040895) with 1 bit error.
• an asterisk shows, that an detected error was corrected. if there is no asterisk, the (not corrected) bit error was in the redundancy part of the codeword
• //PE = Parity Error detected in codeword (if parity check p1 is enabled)

Debug output d1 (LOW) :
=== [00.00.0000 00:00:00] CW(16) 37ms ===

• at time (in brackets), 16 codewords were decoded which took 37 milliseconds.