---
id: edge-sensors
area: edge
level: 3
title: "Artefact — Sensors and actuation"
claim: "Movement · presence · weight · temperature · water and mechanical actuation — chosen per job and integrated into one automation layer."
confidence: running
period: "2020–"
tech: [ESP32, PIR, Radar, mmWave, Load cell, Servo, Solenoid, MQTT]
metrics: [{label: "automations", value: 20}, {label: "PWM channels on the feeder driver", value: 16}]
artefacts: []
public: true
last_verified: 2026-10-26
tags: [edge, sensors, actuation, artefact]
---

# Artefact — Sensors and actuation

**Status: stub.** A sensor and actuator table lands in Phase 7.

## What the artefact is

The parts list of the fleet in the way an engineer would want it: what is sensed, which device senses it, what is actuated, and how the decision reaches a physical action — a relay, a solenoid, a servo, a step-down converter switching 240V, a wheel that flicks food into a tank, an auger that dispenses it, a load cell that decides when to top up water.

## What it proves

Range across the awkward middle of embedded work: not just reading a sensor but choosing an actuator, sizing its driver, and making the whole loop recoverable when the network is absent.

## When it is delivered

Phase 7. Source: evidence notes section 1.