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Schematic

Layout

3D View

R1
Resistance
Resistance
Resistance
10kΩ
R6
Resistance
10 Ω
R5
Resistance
10 Ω
R4
Resistance
1kΩ
R7
Resistance
10 Ω
R8
Resistance
10kΩ
R9
Resistance
10kΩ
PWR
C5
Capacitance
10uF
GPIO36
ESP_RX
RS485_TX
RS485_EN
RS485_TX
GPIO15
GPIO14
ESP_TX
GPIO21
GPIO34
RS485_B
GPIO25
ESP_IO0
RST
ESP_IO0
GPIO22
GPIO16
RS485_A
GPIO5
GPIO13
GPIO17
GPIO12
RS485_EN
GPIO35
GPIO33
RS485_RX
ESP_RX
ESP_EN
GPIO2
RS485_RX
GPIO26
GPIO39
GPIO32
ESP_TX
BOOT
ESP_EN
GPIO23
ESP_IO0
GPIO27
ESP_EN
C4
Capacitance
10uF
C11
Capacitance
0.1uF
C8
Capacitance
10uF
C6
Capacitance
0.1uF
Q1
U2
TERM
C10
Capacitance
0.1uF
C12
Capacitance
0.1uF
Q2
+3V3
+3V3
+3V3
+5V
+5V
+3V3
+3V3
IC3
U1
+3V3
+3V3
+3V3
IC1
D3

ESP32 RS485 (Modbus) Controller Reference Design