FULL-ARM-05/01 serial port emulator made with Arduino Uno
- Arduino UNO
- 12v power supply
- Colored wires
- 8x 1kohm resistor
- Serial type: 2400-N-8-1
- The master sends out every 42ms a string of 10 bytes.
- Connected the Repeater GND in common with the Arduino 12v in -
- Connected the pins 2 and 5 of the serial data-line cable in common to the Arduino 12v in +, they are normally used to power up the optoisolator from the master
- Connected the central pins, 3 and 4, to the Arduino pin 11 for the Tx with the SoftwareSerial library
- Soldered to A2 and A5 pull-down resistors to gnd
- Soldered to A1 and A4 pull-up resistors to +5v
- Soldered to A0 and A3 resistors to both +5v and gnd for a voltage drop to 2.5v
| Byte | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|
| Example | 0xFF | 0x06 | 0x12 | 0x56 | 0x02 | 0x14 | 0x0A | 0x00 | 0x38 | 0xC5 |
| Explanation | This Byte identifies the beginning of the string, it has to be always 0xFF | Right score, in this case 6 | Left score, in this case 12 | Seconds, in this case 56 | Minutes, in this case 2 | State of the lamps, case 0b00000000 no lamp is activated, case 0b00111111 every lamp is activated | Number of matches and priorite signals | Always 0x00 | Red and yellow penalty cards | Checksum = Sum of previous Bytes % 256 |
Communication1 and serial data-line cable schemas + final result
Footnotes
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Image of the optoisolator scheme taken from: https://www.reddit.com/r/Fencing/comments/cufcku/do_anyone_know_where_to_find_those_lightings_and/, thanks to Dalboz989, all rights reserved. ↩