SG12 Scoring Integration

This script for the ESP32 is for interfacing the SG12 Fencing Scoring machine with some web UI.

It uses a max485 based board to convert the logic levels from the RS-422 port on the box to convert the logic levels needed to then connect to the UART (Serial) interfaces of the ESP32.

The ESP32 then sends http post requests to a webserver. It was originally desired to use websockets, but the server that was made used SocketIO which was slightly different.

Protocol

Packets sent begin with 0x01 and end with 0x04. Some of the packet headers we have identified are the following:

• SG12_DEF: 0x1344 (25 bytes long) Contains the left and right scores and cards (Can't seem to get the right red card)
• SG12_TIMER_TICK: 0x1352 (7 bytes long) Contains the timer time and maybe some other stuff too.
• SG12_TIMER_UPDATE: 0x1342 (? bytes long) Contains the timer time and maybe some other stuff too.
• SG12_TIMER_RESET: 0x134E (9 bytes long) Contains the timer time and maybe some other stuff too.
• SG12_LIGHTS: 0x1452 (7 bytes long) Contains data about what lights are on (left/right touch/offtarget) may include grounding?

These names may not be as descriptive or quite representitive of the data (more specifically the SG12_TIMER_TICK and SG12_TIMER_UPDATE).

Data seems to exists as the lower nibble of data of a byte with an upper nibble of 0x3.

TODO

• Not sure where the data for the right redcard is located (may just be broken on our machine).
• Grounding Lights were not a consideration at the time.
• Timer headers may contain some extra info that we don't know.
• Method of sending the HTTP server IP over serial.
• Method of sending WiFi info over serial.
• Status light.

Pictures