Why ESP32 needs capacitors
ESP32 current changes quickly during WiFi activity. A local capacitor helps supply short current bursts and reduce voltage dips.
Bulk and ceramic capacitors
Use a bulk capacitor for energy storage and a 0.1 uF ceramic capacitor close to the ESP32 power pins for high-frequency decoupling.
Layout matters
Place capacitors close to the ESP32 module and regulator. Long wires or breadboards can add resistance and inductance that cause voltage drops.
Calculate your real values
Use the related ESP32 calculator to test your battery, regulator or brownout numbers.
Open calculator