🔧 ESP32 Boot Pin Checker
Select which GPIO pins you plan to use. The tool analyzes strapping conflicts, boot constraints, and wiring risks.
Select GPIO Pins
Strapping pin
Input only
ADC2 (Wi-Fi conflict)
High risk
0 of 38 pins selected
Conflict Analysis
0
Safe Pins
0
Warnings
0
Conflicts
—
Safety Score
Select pins above to analyze conflicts.
Boot Mode Quick Reference
| Pin | Function | Normal Boot | Flash Mode |
|---|---|---|---|
| GPIO0 | Boot mode | HIGH (1) | LOW (0) |
| GPIO2 | Boot confirm | LOW (0) | LOW (0) |
| GPIO5 | Flash CS / VDD_SDIO | — (internal) | — (internal) |
| GPIO12 | Flash voltage select | LOW (0) | ⚠ HIGH=1.8V |
| GPIO15 | Debug / JTAG | HIGH (1) | HIGH (1) |
🔌 Full Interactive Pinout Tool
Search, filter, and explore all 38 GPIO pins with detailed function descriptions.
Open Interactive Pinout Open GPIO Finder