ESP32-Based Industrial Control System with RS485 Communication and I2C Interface
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Circuit Documentation
Summary of the Circuit
This circuit appears to be a complex system involving communication and control elements. It includes an I2C digital potentiometer (Adafruit DS3502), an I/O expander, an opto-isolator board for electrical isolation, an ESP32-based 7" screen module for user interface, a 15-way D-Sub connector for external interfacing, a terminal PCB for power input, an I2C hub to facilitate I2C communication, a UART to RS485 converter for serial communication, and a voltage converter module to step down 48V to 5V. The circuit likely serves as a control panel with various inputs and outputs, interfacing with external devices through the D-Sub connector, and managing signals and power distribution.
Component List
Adafruit DS3502
- Digital potentiometer
- I2C interface
- Adjustable resistance via software
IO Expander
- Expands the number of I/O pins
- Controlled via I2C
Opto-isolator Board
- Provides electrical isolation
- Has multiple channels
ELECROW ESP32 7" Screen
- ESP32-based controller with a 7" display
- Interfaces include I2C and UART
15 way D-Sub
- Connector for interfacing with external devices
- 15-pin configuration
Terminal PCB 2 Pin
- Simple two-pin terminal for power input or other connections
I2C HUB
- Allows multiple I2C devices to connect to a single I2C bus
UART TTL to RS485 Two-way Converter
- Converts between TTL-level UART signals and RS485 signals
48v to 5v Converter
- Steps down 48V to 5V for use in the circuit
Wiring Details
Adafruit DS3502
RL,RW,RHconnected to 15 way D-Sub pins15,8,13respectivelyVCCandGNDconnected to I2C HUBVCCandGNDSCLandSDAconnected to I2C HUBSCLandSDA
IO Expander
P01toP04connected to Opto-isolator BoardIN1toIN4P00connected to Opto-isolator BoardNCVDDandGNDconnected to ELECROW ESP32 7" ScreenBAT+andBAT-VCCandGNDconnected to I2C HUBVCCandGNDSDAandSCLconnected to I2C HUBSDAandSCL
Opto-isolator Board
HVCCconnected to 15 way D-Sub pin15IN1toIN4connected to IO ExpanderP01toP04OUT1toOUT3connected to 15 way D-Sub pins5to7HGNDconnected to 15 way D-Sub pin14GNDconnected to ELECROW ESP32 7" ScreenBAT-
ELECROW ESP32 7" Screen
BAT+connected to IO ExpanderVDD, 48v to 5vout+, and UART TTL to RS485 Two-way ConverterVCCBAT-connected to Opto-isolator BoardGND, IO ExpanderGND, and 48v to 5vout--UARTT0_TXD0andUARTT0_RXD0connected to UART TTL to RS485 Two-way ConverterTXDandRXDGNDconnected to I2C HUBGND3V3connected to I2C HUBVCCSDAandSCLconnected to I2C HUBSDAandSCL
15 way D-Sub
- Pins
1,2connected to Terminal PCB 2 PinPin Aand 48v to 5vin+ - Pins
3,4connected to Terminal PCB 2 PinPin Band 48v to 5vin-- - Pins
9,10connected to UART TTL to RS485 Two-way ConverterAandB
Terminal PCB 2 Pin
Pin Aconnected to 15 way D-Sub pins1,2and 48v to 5vin+Pin Bconnected to 15 way D-Sub pins3,4and 48v to 5vin--
I2C HUB
VCCandGNDconnected to Adafruit DS3502VCCandGND, IO ExpanderVCCandGND, ELECROW ESP32 7" Screen3V3andGNDSDAandSCLconnected to Adafruit DS3502SDAandSCL, IO ExpanderSDAandSCL, ELECROW ESP32 7" ScreenSDAandSCL
UART TTL to RS485 Two-way Converter
VCCandGNDconnected to ELECROW ESP32 7" ScreenBAT+andGNDTXDandRXDconnected to ELECROW ESP32 7" ScreenUARTT0_TXD0andUARTT0_RXD0AandBconnected to 15 way D-Sub pins9and10
48v to 5v Converter
out+andout--connected to ELECROW ESP32 7" ScreenBAT+andBAT-in+andin--connected to 15 way D-Sub pins1,2and Terminal PCB 2 PinPin AandPin B
Documented Code
No code has been provided for the microcontrollers in the circuit. If code is available, it should be documented here with explanations for each function and routine, including setup and loop functions, interrupt service routines, and any communication protocol implementations.