issuePages (40 posts)
Explore issuepages related tutorials, project guides, and expert insights about ESP32, IoT, and embedded systems development.
ESP32 Flash Minimal Sketch
Use a simple sketch to confirm your ESP32 board is functional and isolate issues related to flashing, power, or code. A minimal test is the fastest way to determine if your board boots and runs correctly.
ESP32 Serial Monitor Empty
Resolve the issue of a blank serial monitor when using ESP32 boards. Learn how USB CDC settings, cable type, and startup timing affect serial output - especially for boards like the ESP32-C3 - and follow best practices for reliable debugging via Serial.
ESP32 Flash Read Error
Troubleshoot and resolve flash read errors on ESP32 boards, including corrupted memory, incorrect flash settings, and unstable power. Learn how to identify, erase, and recover from SPI flash failures during boot or after upload.
ESP32 Flash Size Detection Error
Fix upload failures and boot issues caused by mismatched flash configuration. Learn how to identify your ESP32’s flash size, set correct parameters in your IDE, and recover from corrupted partitions with safe default settings.
ESP32 Battery Charging Issues
Diagnose and fix problems related to charging batteries on ESP32 boards with built-in Li-Ion/LiPo charge controllers, including overheating, slow charge, or no charge behavior.
ESP32 Brownout Reset Error
Troubleshoot and resolve issues when the ESP32 keeps restarting due to power instability, triggering the brownout detector.
ESP32 Battery Low Voltage Issues
Learn how insufficient battery voltage can lead to ESP32 brownouts, unexpected resets, or Wi-Fi failures, and how to design power systems that ensure reliable operation.
ESP32 External Power Guide
Learn how to power your ESP32 reliably using external sources. Avoid resets and brownouts by choosing the right adapters, cables, and capacitive buffering - especially when running Wi-Fi, sensors, or peripherals that draw high current.
ESP32 Not Powering or Booting Up
Diagnose and fix issues where the ESP32 shows no signs of life - no LED activity, no serial output, and doesn't enter boot mode.
ESP32 Incorrect VIN Pin Usage
Understand the correct and incorrect uses of the ESP32's VIN (or 5V) pin to avoid damage, unstable operation, or failure to boot.
ESP32 Power Drop Under Load
Fix brownouts and instability caused by power-hungry peripherals. Learn how inrush currents and shared supply paths can affect ESP32 reliability, and follow proven steps to isolate power, buffer voltage drops, and stabilize your setup.
ESP32 Power Path Conflict
Prevent resets and instability caused by powering high-current peripherals from the same supply as your ESP32. Learn how to separate power paths, avoid backfeeding, and ensure clean, stable operation with proper grounding and capacitive buffering.
ESP32 Reboots Randomly
Track down unexpected resets in your ESP32 projects. Learn how to identify power, hardware, and software-related causes - from brownouts and loose wires to watchdog triggers - and apply proven techniques to stabilize your system.
ESP32 USB Current Limit
Avoid resets and brownouts caused by limited USB power. Learn how USB port limits, poor-quality cables, and hubs can affect ESP32 stability - and how to fix it with better cables, power routing, and capacitive buffering.
ESP32 Voltage Divider Misuse on GPIO Pins
Diagnose issues caused by incorrectly using voltage dividers on ESP32 input or bootstrapping pins, leading to failed boots, ADC misreads, or unstable operation.
ESP32 Auto-Reset Failure During Upload
Investigate why the ESP32 fails to auto-reset during flashing, causing upload timeouts unless the BOOT button is held manually. Learn how the reset circuit works and how to fix timing or hardware issues.
ESP32 Driver Issues
Diagnose and fix problems related to USB-to-serial drivers on Windows, macOS, and Linux when your ESP32 isn’t recognized by your computer. Understand how USB-to-UART bridge chips like CP2102, CH340, and FT232 require appropriate drivers for reliable code uploads and serial communication.
ESP32 Port Not Detected
Troubleshoot missing serial port issues when your ESP32 is not recognized by your computer. Learn how to verify the USB connection, install the correct drivers, and check for cable or hardware problems that prevent the board from appearing in your IDE or OS.
ESP32 Serial Port Conflict or Contention
Diagnose and resolve issues caused by multiple processes, libraries, or peripherals trying to access the ESP32's serial ports simultaneously, leading to upload failures or garbled communication.
ESP32 Upload Interrupted or Aborted Midway
Resolve issues where firmware uploads to the ESP32 start but fail partway through, often due to power drops, USB issues, or interference during flashing.
ESP32 Upload Success But No Code Execution
Fix cases where your ESP32 uploads code successfully but fails to start the sketch. Learn how to troubleshoot bootloader hangups, reset circuit issues, and startup code that causes silent reboots or sleep before output appears.
ESP32 USB Boot Mode (ESP32-S2/S3)
Understand and troubleshoot USB boot mode on ESP32-S2 and ESP32-S3 chips, which support native USB flashing without an external USB-to-serial adapter.
ESP32 USB Hub Power Issues
Investigate issues with ESP32 boards failing to upload code, rebooting unexpectedly, or not appearing on serial ports when connected through USB hubs. Focuses on unique challenges introduced by bus-powered or low-quality hubs.
ESP32 Wrong Upload Speed Setting
Troubleshoot issues caused by incorrect baud rate settings during ESP32 firmware uploads, leading to failed connections, corrupted data, or upload instability.
Bad USB Cable
Identify and fix issues caused by using a power-only or poor-quality USB cable with your ESP32. These cables may supply power but lack data lines, preventing code uploads and serial communication. Learn how to recognize cable-related symptoms and choose the right cable for reliable operation.
ESP32 Manual Boot Mode
Learn how to manually enter bootloader mode on ESP32 boards using the BOOT button when automatic upload fails. Step-by-step guidance for resolving "Failed to connect" errors, especially on ESP32-CAM and custom boards without auto-reset circuitry.
ESP32 Upload Timeout Error
Troubleshoot and resolve issues when the ESP32 upload process fails with a timeout error, preventing new code from being flashed to the device.
ESP32 Disconnects Randomly from Wi-Fi
Troubleshoot unexpected or periodic Wi-Fi disconnections on ESP32, especially in long-running applications or under poor signal conditions.
ESP32 Captive Portal Not Redirecting or Working
Troubleshoot issues where the ESP32's captive portal fails to launch in browsers, doesn't redirect automatically, or fails to serve pages correctly.
ESP32 Hidden SSID Problem
Learn how to properly connect your ESP32 to hidden Wi-Fi networks. Understand the need for accurate credentials, use of the correct `WiFi.begin()` overload, and how to troubleshoot issues specific to non-broadcast SSIDs.
ESP32 mDNS Not Working
Resolve issues where the ESP32's `.local` hostname is not accessible on the network, despite enabling mDNS in code.
ESP32 Wi-Fi Connects But No IP Assigned
Diagnose and resolve cases where the ESP32 connects to a Wi-Fi network but fails to obtain an IP address, resulting in no usable network connection.
ESP32 Fails to Sync Time via NTP
Learn why your ESP32 isn't getting the correct time from NTP servers and how to resolve sync issues for real-time applications.
ESP32 Static IP Failure
Learn how to properly configure static IP addresses on ESP32 boards to avoid connection issues. Understand common pitfalls like subnet mismatches, IP conflicts, and unsupported security modes, and follow best practices for reliable networking.
ESP32 Wi-Fi MAC Address Changes Unexpectedly
Learn why the ESP32's MAC address may appear to change between reboots or Wi-Fi modes, and how to ensure consistent device identification.
ESP32 Fails to Reconnect to Wi-Fi Automatically
Fix scenarios where the ESP32 does not reconnect to Wi-Fi after signal loss, router reboot, or waking from deep sleep.
ESP32 Wi-Fi Settings Incompatible with Router
Diagnose connectivity issues caused by router configurations like WPA3-only security, 5 GHz-only networks, or AP isolation. Learn how to adjust settings for ESP32 compatibility and restore stable Wi-Fi communication.
ESP32 Wi-Fi Signal Weak
Improve Wi-Fi reliability by addressing weak signal issues on ESP32 boards. Learn how distance, obstructions, antenna orientation, and interference affect connectivity, and follow practical steps to boost signal strength for stable performance.
ESP32 Wi-Fi Disconnects Due to Sleep Mode
Understand how ESP32's Wi-Fi sleep settings affect connectivity and how to disable or tune them for better network stability.
ESP32 Wi-Fi Connection Failure
Troubleshoot and resolve issues when your ESP32 is unable to establish a connection with the specified Wi-Fi network. Learn about common causes, step-by-step solutions, and best practices for reliable Wi-Fi connectivity in your IoT projects.