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Schematic

Layout

3D View

C4
Capacitance
0.1uF
A3
SDA
ESP_IO18
ESP_IO27
SCL
ESP_IO32
A1
ESP_IO33
U2
Manufacturer Part Number
MCP23017-E/SO
A0
A2
ESP_IO35
ESP_IO23
+3V3
ESP_IO25
+3V3
ESP_IO16
ESP_IO17
ESP_IO26
ESP_IO34
A5
A4
ESP_IO19
+3V3
R3
Resistance
10kΩ
R4
Resistance
4.7kΩ

[Example] ESP32 Reference Design