D.I.Y. Laser Tag Game System

  Infrared Carrier Signal

The carrier frequency is selectable between 38KHz/40KHz/56KHz.  

The system's transmit carrier frequency must be matched to the sensor used.

  Data Packet

Shot Packet = Header Pulse + 14 data bits

[Header] - [8 bits] - [6 bits]

Message Packet = Header Pulse + 24 data bits (or more)  

[Header] - [8 bits] - [8 bits] - [8 bits] ...

The header pulse and data bits are encoded onto a 56KHz infrared carrier signal using pulse-length modulation.  This modulation is similar to the format used in many IR remote controls.

  Pulse-Length Modulation

The value of the data bits ("1" or "0") and the header pulse are represented by the length of the pulse.  Each pulse is a burst of 56 KHz infrared light lasting the period (length) of the corresponding data bit.

• The Header Pulse is represented by a pulse (56 KHz carrier ON) with a period of 2400 uS (microseconds).

• A bit value of "1" is represented by a pulse (56 KHz carrier ON) with a period of 1200 uS. 

• A bit value of "0" is represented by a pulse (56 KHz carrier ON) with a period of 600 uS. 

• The space (56 KHz carrier OFF) between each of the bit pulses is 600uS.

[Header]-[PlayerID]-[Damage]

[Header]-[0ppppppp]-[ttdddd]

 

Header = (2.4 mS burst)

 

ID = 8 bits     0ppppppp  (First bit = "0" for shot packet)

 

ppppppp = PlayerID (7 bits)

see PlayerIDs in manual

Team/Damage = 6 bits   ttdddd

 

tt = TeamID (2 bits)

00 = Red

01 = Blue

10 = Yellow

11 = Green

dddd = Damage (4 bits)

0000 = 1

0001 = 2

0010 = 4

0011 = 5

0100 = 7

0101 = 10

0110 = 15

0111 = 17

1000 = 20

1001 = 25

1010 = 30

1011 = 35

1100 = 40

1101 = 50

1110 = 75

1111 = 100

[Header]-[Byte1]-[Byte2]-[0xE8]

[Header]-[0x83]-[Command]-[0xE8]

Command = see table below

[Header]-[0x87]-[Type]-[0xE8]-[data]-[data]...

Type 0x01 = Cloning Data

Type 0x03 = Score Data (Part 1)

Type 0x04 = Score Data (Part 2)

Type 0x05 = Score Data (Part 3)

Valid Messages

(Long Packets)

BYTE

VALUE