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Schematic

Layout

3D View

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

ESP32 RS485 (Modbus) Controller Reference Design