The most common OBD2 codes explained: P0420, P0300, P0171, P0442, P0128 and more — what they mean, typical causes and what to check first.
ELM327 online OBD2 scanner in Chrome or Edge: read and clear codes, live data with graphs, freeze frame, readiness and VIN with any USB or Bluetooth adapter.
ESP32 battery voltage monitoring: voltage divider values for 1S–24 V, low-drain design, calibrated ADC readings with analogReadMilliVolts and percent tables.
WS2812B power calculator: current per pixel, power supply size, power injection, wire gauge and the WLED current limiter setting for your LED strip.
Flash ESP32 from your browser in a minute: official WLED, ESPHome, Tasmota installers or any .bin with our free web flasher. Addresses and fixes.
Distance to fault explained: how a VNA finds damaged connectors, kinks and water in coax, resolution, velocity factor table and how to read the DTF graph.
NanoVNA vs tinySA vs Siglent SHA850A compared: what each RF tool measures, frequency range, price and which one you need for antennas or transmitters.
LoRa link budget step by step: free-space path loss, SX1262 sensitivity by spreading factor, RSSI vs SNR and the margin you need for Meshtastic.
Is your Meshtastic antenna really tuned for 915 MHz? How to test SWR, resonance and impedance with a VNA, tune it, and when to upgrade.
Meshtastic range calculator for 915/868 MHz LoRa: link budget, presets, antenna height and terrain. Realistic distances and how to add miles.