Polaris GPIO Datasheet

NORTHSTARSHOW SYSTEMS

Polaris GPIO Datasheet

Electrical and configuration specifications

Document Number	Revision	Date	Platform Version
NSSS-DOC-0051	A	2026-05-20	1.0

Function

The Polaris GPIO Node provides up to ten configurable digital I/O channels. Each channel can be assigned in Compose as either an output (drives relays, pneumatic valves, indicator lights) or an input (PIR sensors, mushroom buttons, end-stop switches).

Pin Map

Channel	Arduino Pin	Default Direction	Notes
1	D2	Output	5 V active-high, configurable in Compose
2	D3	Output
3	D4	Output
4	D5	Output
5	D6	Output
6	D7	Output
7	D8	Output
8	D9	Output
9	D10	Output
10	D11	Output

Electrical Specifications

Specification	Value
Output high voltage	5 V nominal
Output low voltage	0 V
Output sink/source per pin	8 mA maximum
Recommended interface	Opto-isolated relay module rated for the load
Input voltage range	0 to 5 V
Input high threshold	~3 V
Input low threshold	~1.5 V
Internal pull-up	Optional, enabled per-channel in Compose
Recommended input	NC mushroom buttons with internal pull-up enabled
Debounce	50 ms default, configurable per-input in Compose

UDP Command Set

cue (string)	Effect
fire	Set the channel to value (1 = high, 0 = low)
release	Set the channel low
pulse	Drive high for duration_ms, then return low
stop	Set every output low

Example Heartbeat

{"type":"heartbeat","node_id":"abc-123","uptime":3600,"fw_version":"1.0.0"}

Example Input Event

{"type":"input","node_id":"abc-123","index":2,"name":"Foyer PIR","pin":3,"value":1}

NSSS-DOC-0050Polaris Family Overview
NSSS-DOC-0045Polaris Firmware Bootstrap
NSSS-DOC-0073UDP Cue Command Reference

Revision History

Revision	Date	Description
A	2026-05-20	Initial publication