Raspberry Pi projects with MQTT: Python clients, gateways, sensors, Node-RED and dashboards connected to a cloud MQTT broker.
Wire an RC522 RFID reader to a Raspberry Pi, read tags in Python, check them against a local allowlist and publish every access attempt as an MQTT event that loggers, dashboards and alerting tools can consume.
A practical guide to keeping a Raspberry Pi MQTT gateway running for months: storage wear, read-only filesystems, power, cooling, hardware and software watchdogs, and remote health monitoring.
The Pico 2 W keeps the Pico W's footprint and Wi-Fi chip but swaps the RP2040 for the faster RP2350. This comparison looks at what that means for MQTT devices: CPU, memory, TLS, security features, software support, and which board to buy for which project.
Use the Raspberry Pi's built-in Bluetooth, the bleak library and paho-mqtt to scan BLE sensor advertisements, decode temperature and humidity, and publish throttled readings to MQTT.
Install Mosquitto on a Raspberry Pi, lock it down with passwords and a sensible listener config, test it with mosquitto_pub and mosquitto_sub, and learn when a local broker should bridge to a cloud broker.
Turn a Python MQTT client into a proper systemd service on a Raspberry Pi: start after the network and clock are ready, restart automatically, keep credentials in an environment file and shut down cleanly.
A complete Raspberry Pi MQTT tutorial: set up a Python virtual environment, publish CPU and sensor readings, switch an LED over MQTT, run the script as a service and move to TLS with your own credentials.
Use IOTstack to run Node-RED, InfluxDB and Grafana in Docker on a Raspberry Pi, skip the local Mosquitto container and connect Node-RED to an external cloud MQTT broker instead.
How industrial Raspberry Pi controllers such as the Revolution Pi and other CM4-based devices bridge digital and analog field signals to MQTT, with architecture, code and production practices.
Wire an HC-SR04 ultrasonic sensor to a Raspberry Pi with a safe voltage divider, filter noisy readings in Python and publish tank fill level and presence events over MQTT for dashboards and automations.
Build a store-and-forward MQTT publisher in Python that writes every reading to SQLite first, then replays the queue in order with QoS 1 acknowledgements once the connection is back.
Poll Modbus RTU devices over RS-485 and Modbus TCP devices over Ethernet from a Raspberry Pi with pymodbus, decode scaled and 32-bit float registers correctly, and publish clean JSON to an MQTT broker.
A hands-on hardening checklist for Raspberry Pi IoT devices covering accounts, SSH keys, firewall rules, updates, systemd sandboxing, secrets and TLS-encrypted MQTT connections.
A complete, tested path from a bare Raspberry Pi Pico W to a connected MQTT device. Flash MicroPython, install umqtt.simple, publish the onboard temperature sensor, switch the LED from anywhere and keep the connection alive through Wi-Fi drops.
Use gpiozero and paho-mqtt to switch Raspberry Pi outputs from MQTT commands and publish input changes as retained state, with a clean command/state topic design that works on every Pi model.
Encrypt and authenticate your Raspberry Pi Pico W's MQTT traffic. This guide covers firmware and library versions, loading the right root certificate, setting the clock, verifying the server, measuring handshake time and fixing the common TLS errors.
A practical guide to turning a Raspberry Pi into an IoT gateway: protocol adapters for BLE, Modbus and serial, a normalised topic and payload model, a store-and-forward buffer, and a secure uplink to a cloud MQTT broker.
Wire a 4-channel relay board to a Raspberry Pi, control each channel from MQTT topics with Python and gpiozero, and use retained messages so every relay returns to the right state after a reboot or power cut.
A small Python service that publishes CPU temperature, load, memory, disk usage and under-voltage flags from every Raspberry Pi to MQTT, with a last will so you know when a Pi goes offline.
Turn a Raspberry Pi with a CAN HAT into a gateway that reads frames with python-can, decodes signals from a DBC file and publishes rate-limited JSON to an MQTT broker.
Build a motion detector with a Raspberry Pi camera and Picamera2, save a snapshot when something moves, and publish motion events with snapshot links over MQTT so dashboards, phones and automations can react.
Turn a Raspberry Pi Sense HAT into a two-way MQTT device: publish environment and orientation readings as JSON, and scroll messages sent from any MQTT client across the 8x8 LED matrix.
Turn a Raspberry Pi Pico W into a battery-powered MQTT sensor that wakes, measures, publishes and sleeps again. Covers MicroPython lightsleep, Wi-Fi shutdown, battery voltage reading and the pitfalls that drain cells.
Build a full-screen touchscreen control panel on a Raspberry Pi. Buttons publish MQTT commands, the screen reflects the real device state from retained messages, and the panel starts automatically on boot.
Receive point-to-point LoRa packets on a Raspberry Pi with an RFM95 or SX127x HAT, match radio settings with your senders and republish every packet as JSON to an MQTT broker.
Wire a BME680 to a Raspberry Pi, calibrate a gas baseline, compute a simple indoor air quality score and stream everything to an MQTT broker you can watch from anywhere.
A practical Raspberry Pi vs ESP32 comparison for IoT builders: how a Linux single-board computer and a Wi-Fi microcontroller differ in power, cost, reliability and MQTT tooling, and when to use both together.
Install InfluxDB 2, Telegraf and Grafana on a 64-bit Raspberry Pi, subscribe Telegraf to an MQTT broker, store sensor readings as time series and chart them in Grafana.
Enable 1-Wire on a Raspberry Pi, connect several DS18B20 temperature probes to one GPIO pin, read them from Python without extra libraries and publish named, validated readings over MQTT.
Configure a Mosquitto bridge on a Raspberry Pi that forwards selected local topics to a cloud MQTT broker over TLS, receives commands back, queues messages during outages and avoids message loops.
Create an account, get your broker credentials and connect your first device — no servers to install, patch or scale.
