ESP32 Relay Boot Glitches: Active-Low Inputs, Pull Resistors and Safe Startup
Stop ESP32 relays clicking during boot and reset. Active-low inputs, restore_mode, pull resistors, strapping pins, power issues and safe ESPHome startup.
ESPHome OTA Update Failed: Safe Mode, Recovery and USB Reflashing
Fix ESPHome OTA update failures: IP and port troubleshooting, 2026.9 encrypted OTA migration, boot loops, Safe Mode, rollback, partition errors and ESP32 USB reflashing.
ESPHome Wi-Fi Disconnects: Fix Reconnect Loops and Offline ESP32 Nodes
Fix ESPHome Wi-Fi disconnects, reconnect loops and offline ESP32 nodes. Diagnose RSSI, power save, API reboot timeouts, DHCP/static IP, fast_connect, fallback APs, power problems and router issues.
ESP32-S3 USB Not Detected: Boot Mode and Upload Recovery
Fix an ESP32-S3 that is not detected over USB. Covers native USB vs USB-UART, BOOT/RESET recovery, ROM download mode, Arduino USB CDC settings, GPIO19/20 conflicts, drivers, cables and boot loops.
ESP32 Guru Meditation Errors: How to Debug Crashes (Serial Logs + Backtrace Decode)
When an ESP32 randomly resets, freezes, or shows a “Guru Meditation Error”, one of the simplest and most effective ways to find the problem is to log progress to the Serial Monitor. The idea is very basic: Add Serial.println(“Line X”);…
ESP32 I2C Devices Scan
I2C is one of the simplest ways to connect multiple sensors and peripherals to your ESP32 using only two wires (SDA and SCL). When debugging a new project, the first thing you should do is scan the I2C bus and…