{"id":1879,"date":"2026-08-08T01:00:03","date_gmt":"2026-08-07T22:00:03","guid":{"rendered":"https:\/\/sobotz.com\/en\/?post_type=product&p=1879"},"modified":"2026-08-08T01:00:03","modified_gmt":"2026-08-07T22:00:03","slug":"st4rt-sobotz-sumo-start-module","status":"publish","type":"product","link":"https:\/\/sobotz.com\/en\/product\/st4rt-sobotz-sumo-start-module\/","title":{"rendered":"ST4RT SoBotz Sumo Start Module"},"content":{"rendered":"

ST4RT Start Module<\/strong><\/p>\n

A compact start-stop module built to the official sumo start module spec (p1r.se\/startmodule<\/a>), with one difference: an extra pin you don’t get on other boards.<\/p>\n

Electrical characteristics<\/strong><\/p>\n

\n\n\n\n\n\n\n\n
<\/th>\n<\/th>\n<\/tr>\n<\/thead>\n
Supply voltage<\/td>\n2.8\u20135.2V<\/td>\n<\/tr>\n
Dimensions<\/td>\n[10.2 x 10.2 x 6 mm]<\/td>\n<\/tr>\n
Weight<\/td>\n[0.45 g]<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Pinout<\/strong><\/p>\n

\n\n\n\n\n\n\n\n\n\n
Pin<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
K<\/td>\nKill switch signal<\/td>\n<\/tr>\n
S<\/td>\nStart signal<\/td>\n<\/tr>\n
\u2013<\/td>\nGND<\/td>\n<\/tr>\n
+<\/td>\nVCC<\/td>\n<\/tr>\n
IR<\/td>\nRaw IR receiver output \u2014 separate pin<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

K\/S\/-\/+ match the p1r.se pinout exactly, so ST4RT drops straight onto any robot already built for the official module. IR is broken out on its own, additional pin.<\/p>\n

IR pin<\/strong><\/p>\n

Most start modules only give you the processed K and S signals. ST4RT also breaks out the raw IR receiver line on its own pin, so your microcontroller can read a separate tactics remote directly \u2014 no second IR receiver needed if you want extra strategy logic.<\/p>\n

How it works<\/strong><\/p>\n

    \n
  1. Program the module to a referee remote \u2014 power up, the referee sends the pairing signal, LED blinks twice.<\/li>\n
  2. The module now listens for start\/stop on that channel. LED turns on when started, blinks when stopped.<\/li>\n
  3. Your robot waits for S to go high to start, and watches K for the kill signal.<\/li>\n<\/ol>\n

    Power-loss protection<\/strong><\/p>\n

    The module saves its current state to non-volatile memory. If power drops while the module is in the “started” state \u2014 a bump, a bad connector, a battery hiccup \u2014 it comes back started when power returns, instead of sitting there waiting for a signal that already happened. Your match doesn’t get cut short by a wiring glitch.<\/p>\n

    If the LED is already on before the referee sends a start command, the module is still in that “started” state from before \u2014 send stop, then restart the robot to reset it back to power-on state.<\/p>\n

    Wiring<\/strong><\/p>\n

    Connect + and \u2013 to your battery (2.8\u20135.2V), S to a digital input pin on your MCU for start, K for the kill switch, and optionally IR to a second input if you want to read the raw remote signal.<\/p>\n","protected":false},"excerpt":{"rendered":"

    The smallest start-stop module for sumo, built as a drop-in for the official p1r.se start module<\/a> \u2014 same pinout, so it fits any robot already wired for one.<\/p>\n