Maker Electronics
ESP32 keeps rebooting in a boot loop
Use serial output, power checks and a minimal sketch to identify repeated ESP32 resets.
Category
Maker Electronics
Arduino, ESP32, sensors, firmware and embedded electronics debugging.
Diagnose
Error fixes
Maker Electronics
Arduino upload timeout or programmer not responding
Fix upload failures by checking the cable, port, board target, bootloader timing and serial conflicts.
Maker Electronics
ESP32 cannot connect to Wi-Fi
Use serial logs and a minimal sketch to isolate credentials, band, security and power issues.
Maker Electronics
ESP32 serial monitor shows unreadable characters
Match serial speed, boot messages and signal integrity when ESP32 output appears as garbage.
Maker Electronics
ESP32 upload fails to connect to the chip
Enter download mode and remove pin conflicts when the uploader cannot connect.
Maker Electronics
Arduino board does not appear as a serial port
Find cable, USB driver, bootloader and board hardware causes when no Arduino port appears.
Maker Electronics
Arduino analog sensor readings are noisy
Reduce unstable analog readings by checking reference, grounding, wiring, source impedance and sampling.
Maker Electronics
I2C device is not found by the scanner
Recover a missing I2C sensor by checking voltage, address, pull-ups and bus wiring.
Maker Electronics
Relay module resets the microcontroller
Prevent relay switching from browning out or disturbing a microcontroller.
Maker Electronics
Servo motor jitters while holding position
Stabilize a servo by fixing power, ground, signal timing and mechanical load.
Maintain and recover
Guides
Maker Electronics
How to flash an ESP32 safely
Prepare board settings, power and recovery before writing firmware to an ESP32.
Maker Electronics
How to measure DC voltage with a multimeter
Set meter range and reference correctly before probing low-voltage electronics.
Maker Electronics
How to debug a microcontroller with serial logs
Capture boot, state and error information without flooding timing-sensitive code.
Maker Electronics
How to troubleshoot an I2C bus
Check power, pin mapping, addresses and electrical levels in a controlled order.
Maker Electronics
How to size a power supply for a maker project
Estimate continuous and peak current with margin for motors, radios and startup loads.
Maker Electronics
How to check breadboard continuity
Find broken rails, misplaced rows and weak jumper connections before debugging code.