ST4RT Start Module
A compact start-stop module built to the official sumo start module spec (p1r.se/startmodule), with one difference: an extra pin you don’t get on other boards.
Electrical characteristics
| Supply voltage | 2.8–5.2V |
| Dimensions | [10.2 x 10.2 x 6 mm] |
| Weight | [0.45 g] |
Pinout
| Pin | Function |
|---|---|
| K | Kill switch signal |
| S | Start signal |
| – | GND |
| + | VCC |
| IR | Raw IR receiver output — separate pin |
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.
IR pin
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 — no second IR receiver needed if you want extra strategy logic.
How it works
- Program the module to a referee remote — power up, the referee sends the pairing signal, LED blinks twice.
- The module now listens for start/stop on that channel. LED turns on when started, blinks when stopped.
- Your robot waits for S to go high to start, and watches K for the kill signal.
Power-loss protection
The module saves its current state to non-volatile memory. If power drops while the module is in the “started” state — a bump, a bad connector, a battery hiccup — 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.
If the LED is already on before the referee sends a start command, the module is still in that “started” state from before — send stop, then restart the robot to reset it back to power-on state.
Wiring
Connect + and – to your battery (2.8–5.2V), 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.
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