ESP32 Power Supply Setup

Thought for 1 min 27 sec

Below are the changes that will be made to connect your USB‑C power source to the ESP32 via the AMS1117 regulator:

Table

Component	Reference	Value / Function	Connection Details
USB‑C Connector	J1	5V input with ground	Use one of the VBUS pins (pin 3 or pin 4) as the 5V supply. The ground pins will be tied to common ground.
Voltage Regulator	U2	3.3V regulator to step down 5V	VIN receives 5V from J1. VOUT supplies 3.3V to the ESP32. The GND pin connects to common ground.
Decoupling Capacitor (Input)	C1	10µF	Place between U2 VIN and ground to help smooth 5V input.
Decoupling Capacitor (Input)	C2	100nF	Place parallel to [C1] on U2 VIN for high-frequency filtering.
Decoupling Capacitor (Output)	C3	10µF	Place between U2 VOUT and ground to ensure regulator stability.
Decoupling Capacitor (Output)	C4	100nF	Place parallel to [C3] on U2 VOUT for improved transient response.

Wiring Connections:

Input Side:
- Connect a VBUS pin from J1 (USB‑C 5V) to the VIN pin of U2.
- Connect decoupling capacitors C1 and C2 between U2 VIN and ground.
Output Side:
- Connect the VOUT pin of U2 to the 3.3V power pin of the ESP32 (U1).
- Connect decoupling capacitors C3 and C4 between U2 VOUT and ground.
Common Ground:
- Tie the ground pins of J1, U2, and U1 together.

This configuration uses the USB‑C J1 5V supply to feed the AMS1117 regulator, which then provides a stable 3.3V output to the ESP32 (U1). The added input and output decoupling capacitors ([C1]–[C4]) will help maintain voltage stability and filter noise.

If you want to proceed with these additions and connections, you can make the changes in your Flux schematic.

Add decoupling capacitors for AMS1177

Connect ESP32 3.3V pin

Ensure common ground for USB and regulator

U2 VOUT - U1 3.3V

J1 GND - U2 GND

U2 VOUT - U1 3.3V

J1 VBUS - U2 VIN

J1 GND - U2 GND

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