SolderHub Editorial
Articles &
Guides
In-depth tutorials, component deep-dives, and hardware engineering insights — written for builders.
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XIAO RP2350 Pinout Guide: Every GPIO on Seeed's Compact RP2350 Board
A complete Seeed XIAO RP2350 pinout reference — all 19 GPIOs, ADC, PWM, the separate hardware UART, and the dual-architecture RP2350 chip's security features in Seeed's thumbnail-sized form factor.
ESP32-C3 Pinout Guide: GPIO, ADC, PWM, and Single-Core RISC-V Explained
A complete ESP32-C3 pinout reference — verified strapping pins, GPIO, ADC, PWM, and the WiFi 4 + BLE 5.0 radio set that makes this chip the budget pick of the ESP32 family.
ESP32 DHT11 Dashboard with Blynk: Gauge and History Chart
Send DHT11 temperature and humidity from an ESP32 to Blynk 2.0. Configure two datastreams, build dashboard gauges and a history chart, use a timer instead of flooding the cloud, and troubleshoot missing readings.
Blynk Relay Control with ESP32: Safe Boot and State Synchronization
Build a Blynk-controlled ESP32 relay interface with explicit safe boot behavior, separate requested and reported state, and reconnection synchronization. Covers active-low module differences and why dashboard state is not proof of a switched load.
Blynk vs Node-RED vs Home Assistant vs MQTT: Which Should You Choose?
Compare Blynk, Node-RED, Home Assistant and MQTT by purpose, hosting, dashboards, automation, offline behavior and maintenance. Choose a practical stack for ESP32 and ESP8266 projects without adding unnecessary components.
8-Channel Relay Control with Node-RED and MQTT State Feedback
Build an 8-channel relay dashboard using Node-RED and MQTT with separate command and reported-state topics. Plan reconnect behavior, retained-state policy and safe startup without letting the UI misrepresent the hardware.
HTTP In Node-RED: Build an API and Receive ESP32 POST Data
Create a Node-RED HTTP POST endpoint, send JSON from an ESP32, validate headers and payload fields, return meaningful HTTP status codes, and connect an API response to a flow. Includes network and access-control cautions.
PIR Motion Alerts from Node-RED to Telegram or Email
Turn PIR sensor events into Node-RED Telegram or email alerts without spamming your inbox. Detect state transitions, add a cooldown and test unavailable-network and repeated-trigger scenarios.
Secure Node-RED: Login, HTTPS, MQTT TLS, Backups and Git
Harden a Node-RED deployment with editor authentication, HTTPS or a secure reverse proxy, restricted network access, MQTT security, secret handling and recoverable flow backups. Learn what not to expose to the internet.
Store Node-RED Sensor Data in InfluxDB 2.x and Chart It in Grafana
Build a time-series logging path from Node-RED to InfluxDB 2.x and Grafana. Validate MQTT sensor payloads, write measurements with units, configure a least-privilege token and chart trends without confusing missing samples with zero.
Node-RED Automations: Schedules, LDR Lighting and Context Variables
Build practical Node-RED automations with scheduled Inject nodes, an LDR-based light rule, hysteresis and context variables. Learn to avoid rapid switching, handle stale readings and decide which state should survive a restart.
Reliable Node-RED Flows: Subflows, Link Nodes, Catch and Backups
Organize large Node-RED projects with subflows, Link In/Out nodes, Catch and Status handling, message validation and versioned backups. Learn how to make imports, deployment and recovery more predictable.