Is HC-SR04 Ultrasonic Distance Sensor Compatible with Home Assistant (MicroPython)?

Verdict Badge

VERDICT: [ NATIVELY SUPPORTED ]

Protocol: GPIO Pulse / Voltage Divider

Bridge Needed: NO

Hardware Safety & Verification Specs

Electrical parameters & logic voltage safety limits before powering ICs

🟢 3.3V Native Direct Hookup 🧪 Verified in Lab

Logic Voltage 3.3V Low-Power CMOS

Voltage Rating 3.0V - 3.3V DC Rail

Current Profile Peak Tx Current: ~180mA to ~250mA @ 3.3V

Environment Rating IP20 Indoor Climate Control

## Compatibility Overview

Ultrasonic distance measurement pairing using Pico W for tank level monitoring sump pump monitoring or robot obstacle avoidance.

Interactive Pinout & Wiring Diagram

Hover over any pin to view voltage limits and pull-up specifications

VCC

3.3V Power

GND

Ground Common

SDA / TX

Data Line (GPIO 21)

SCL / RX

Clock Line (GPIO 22)

CS / INT

Chip Select (GPIO 19)

## Technical Specification Matrix

Feature / Attribute	Specification / Status
Hardware Protocol	GPIO Pulse / Voltage Divider
Bridge Required	NO
Border Router Needed	None
Exposed Entities	Distance (cm) Proximity Alarm
Pairing Complexity	Plug-and-Play
Factory Reset Instruction	Hold BOOTSEL while inserting USB cable.

## Step-by-Step Pairing Guide

Factory Reset Device

Hold BOOTSEL while inserting USB cable.

Initialize Pairing Mode on Home Assistant (MicroPython)

Open Home Assistant (MicroPython) administration console, navigate to Integrations / Add Device, and start pairing scanner.

Confirm Entity Binding & State Verification

Verify that primary entities (Distance (cm), Proximity Alarm) report live state changes inside Home Assistant (MicroPython).

Production Code Generator & Preset Toolkit

Pre-configured pinouts & drivers for HC-SR04 Ultrasonic Distance Sensor

SDA Pin: SCL Pin:

Test in Wokwi Simulator ↗ | Real-time pin binding active

👥 Community Verified Database Continuous hardware testing updates

Report a Pinout Error or Submit Tested Code Snippets

Found a pin mapping quirk or built a custom ESPHome YAML driver for HC-SR04 Ultrasonic Distance Sensor? Help us keep this matrix 100% accurate.

## Frequently Asked Questions

Does this device operate in Offline Mode?

100% local pulse timing execution.

What is the expected Battery Life & Power specification?

5V VCC for HC-SR04 Trig=GPIO14 Echo=GPIO15 (requires 1k/2k resistor voltage divider to 3.3V).

How does Signal Mesh & Range Extension function?

Wi-Fi 802.11n.

Related Compatibility Matrix Guides

I2C Bus / 3.3V