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LEGO RC Trains (not PowerFunctions) IR protocol explained
roeltrain posted a topic in LEGO Train Tech
Hello LEGO Trainenthousiasts, I've made a PowerFunctions-IRcontroller for 4 trains + lights + 3 railswitches with servo's based on an Arduino Uno R3 : https://forum.arduin...?topic=369292.0 One of demands was also using the older LEGO RC-trains. But on the internet no information was found. So with aid of a logicanalyzer I proudly presents the outcome of this investigation: An experiment to make this functional: http://forum.arduino...?topic=320405.0 LEGO RC TRAINS PROTOCOL note: mu s means micro seconds channel 4 means combichannel 1+2+3 This is not the LEGO PowerFunctions IR protocol version 1.20 as described at http://www.philohome...ons_RC_v120.pdf This protocol described below is the predecessor of LEGO PF. Start = Stop is bitstream 36kHz with 10 bits and pauze 1930 mu s Uno is bitstream 36kHz with 10 bits and pauze 280 mu s Zero is bitstream 36kHz with 10 bits and pauze 844 mu s 1 bit has a duty-cycle 16 mu s high and 11,5 mu s low pauze (common factor 18 ms, so factors for Channel actie bitstreams blok-pauze-blok-pauze-blok-pauze-blok) 1 up Start 1111 1111 1110 0001 Stop 3+2+2 = bitstream1 pauze = 3*18ms bitstream2 pauze = 2*18ms bitstream3 pauze = 3*18ms bitstream4 1000 0111 1111 1110 1001 1000 4+5+3 1 down Start 1111 1111 1101 0010 Stop 2+2+3 Start 0111 1111 1101 1010 Stop 3+2+3 1 stop Start 0111 1111 1111 1000 Stop 3+2+2 Start 1111 1111 1111 0000 Stop -------- 1 horn Start 1111 1111 1100 0011 Stop -------- Start 0111 1111 1100 1011 Stop -------- 2 up Start 1110 1111 1110 0010 Stop 2+3+5 Start 0110 1111 1110 1010 Stop -------- 2 down Start 1110 1111 1101 0011 Stop 5+3+3 Start 0110 1111 1101 1011 Stop -------- 2 stop Start 1110 1111 1111 0001 Stop 5+4+4 Start 0110 1111 1111 1001 Stop -------- 2 horn Start 1110 1111 1100 0100 Stop -------- Start 0110 1111 1100 1100 Stop -------- 3 up Start 1101 1111 1110 0011 Stop 5+4+2 Start 0101 1111 1110 1011 Stop -------- 3 down Start 1101 1111 1101 0100 Stop 3+2+2 Start 0101 1111 1101 1100 Stop -------- 3 stop Start 1101 1111 1111 0010 Stop 5+4+5 Start 0101 1111 1111 1010 Stop -------- 3 horn Start 1101 1111 1100 0101 Stop -------- Start 0101 1111 1100 1101 Stop -------- 4 up Start 1100 1111 1110 0100 Stop 2+3+5 Start 0100 1111 1110 1100 Stop -------- 4 down Start 1100 1111 1110 0101 Stop 3+2+3 Start 0100 1111 1110 1101 Stop -------- 4 stop Start 0100 1111 1111 1011 Stop 3+2+3 Start 1100 1111 1111 0011 Stop 2+3+3 4 horn Start 1100 1111 1100 0110 Stop -------- Start 0100 1111 1100 1110 Stop -------- (STOP- button keeps repeating when hold, all others (UP, DOWN, HORN) send only once a message 1e nibble: bit1 bit2 bit3 bit4 Kanaal 1 toggle 1 1 1 Kanaal 2 toggle 1 1 0 Kanaal 3 toggle 1 0 1 Kanaal 4 toggle 1 0 0 2e nibble 1 1 1 1 bit1 bit2 bit3 bit4 3e nibble 1 1 Up 1 0 Down 0 1 Stop 1 1 Horn 1 0 4e nibble toggle ? ? ? (checksum ???) Togglebit reverse from 1st nibble bit1 Any additions/suggestions? I like them