Complete XIAO ESP32S3 Carrier Board - Final Wiring Diagram
With LED Test Circuit + E-Ink Connections (D10=MOSI, D8=SCK)
XIAO ESP32S3
Seeed 113991114
USB-C
5V
1
GND
2
3V3
3
D0
4
D1
5
D2
6
D3
7
D4 (SDA)
8
D5 (SCL)
9
D6
10
D7 (TX)
11
D8 (SCK)
12
D9 (MISO)
13
D10 (MOSI)
14
D10=GPIO9 (MOSI), D9=GPIO8 (MISO), D8=GPIO7 (SCK)
LED Test Circuit
D0
D1
LED (Red)
0805 or 1206
R1
1kΩ
0805 or 1206
GND
J2: I2C Connector
4-pin Male Header
1: SDA (D4)
2: SCL (D5)
3: 3V3
4: GND
J3: SPI Connector
8-pin Male Header (E-Ink)
1: MOSI (D10)
2: SCK (D8)
3: CS (D3)
4: DC (D2)
5: RST (D1)
6: BUSY (D6)
7: 3V3
8: GND
3V3
GND
✅ Week 1 Testing Plan
Step 1: Upload blink code to test LED on D0 → Proves power & basic circuit works
Step 2: Plug I2C sensor into J2, run I2C scanner → Proves I2C pins work
Step 3: When you get e-ink display, plug into J3 → Proves SPI pins work