Circuit Documentation

Summary

This circuit is designed to interface an ESP32 microcontroller with various sensors and modules, including a Micro SD Card Module, Wind Direction Sensor, RTC DS3231, Wind Vane, 16x2 I2C LCD, and a UART TTL to RS485 Two-way Converter. The circuit also includes a 12V power supply and connectors for power distribution. The ESP32 handles data acquisition, storage, and communication with the connected peripherals.

Component List

Micro SD Card Module

• Description: A module for interfacing with micro SD cards.
• Pins: cs, sck, mosi, miso, vcc, gnd

Wind Direction Sensor

• Description: A sensor for measuring wind direction.
• Pins: GND, VIN, NC, Data

Esp32 on Baseboard

• Description: A development board featuring the ESP32 microcontroller.
• Pins: GPIO23, GPIO22, GPIO1/TX, GPIO3/RX, GPIO21, GPIO19, GPIO18, GPIO5, GPIO17, GPIO16, GPIO4, GPIO0, GPIO2, GPIO15, SD1, SD0, CLK, V, G, GPIO36, GPIO39, GPIO34, GPIO35, GPIO32, GPIO33, GPIO25, GPIO26, GPIO27, GPIO14, GPIO12, GPIO13, SD2, SD3, GND, 5V, 3V, TX, RX, VCC, D22, D21

UART TTL to RS485 Two-way Converter

• Description: A module for converting UART TTL signals to RS485.
• Pins: VCC, TXD, RXD, GND, A, B

RTC DS3231

• Description: A real-time clock module.
• Pins: 32K, SQW, SCL, SDA, VCC, GND

Wind Vane

• Description: A sensor for measuring wind speed.
• Pins: A0, VCC, GND

16x2 I2C LCD

• Description: A 16x2 character LCD with I2C interface.
• Pins: GND, VCC, SDA, SCL

12V Power Supply

• Description: A power supply providing 12V output.
• Pins: +, -

2.1mm Male Connector

• Description: A 2.1mm male power connector.
• Pins: +, -

2.1mm Barrel Jack with Terminal Block

• Description: A 2.1mm barrel jack with terminal block for power connections.
• Pins: POS, NEG

Wiring Details

Micro SD Card Module

• cs connected to GPIO5 of Esp32 on Baseboard
• sck connected to GPIO18 of Esp32 on Baseboard
• mosi connected to GPIO23 of Esp32 on Baseboard
• miso connected to GPIO19 of Esp32 on Baseboard
• vcc connected to VCC of Esp32 on Baseboard
• gnd connected to GND of Esp32 on Baseboard

Wind Direction Sensor

• GND connected to NEG of 2.1mm Barrel Jack with Terminal Block
• VIN connected to POS of 2.1mm Barrel Jack with Terminal Block
• NC connected to A of UART TTL to RS485 Two-way Converter
• Data connected to B of UART TTL to RS485 Two-way Converter

Esp32 on Baseboard

• GPIO23 connected to mosi of Micro SD Card Module
• GPIO22 connected to SCL of RTC DS3231 and 16x2 I2C LCD
• GPIO21 connected to SDA of RTC DS3231 and 16x2 I2C LCD
• GPIO19 connected to miso of Micro SD Card Module
• GPIO18 connected to sck of Micro SD Card Module
• GPIO5 connected to cs of Micro SD Card Module
• GPIO17 connected to TXD of UART TTL to RS485 Two-way Converter
• GPIO16 connected to RXD of UART TTL to RS485 Two-way Converter
• GPIO4 connected to A0 of Wind Vane
• GND connected to GND of Wind Vane, RTC DS3231, 16x2 I2C LCD, UART TTL to RS485 Two-way Converter, and Micro SD Card Module
• 5V connected to VCC of Wind Vane
• VCC connected to VCC of RTC DS3231, 16x2 I2C LCD, UART TTL to RS485 Two-way Converter, and Micro SD Card Module

UART TTL to RS485 Two-way Converter

• TXD connected to GPIO17 of Esp32 on Baseboard
• RXD connected to GPIO16 of Esp32 on Baseboard
• VCC connected to VCC of Esp32 on Baseboard
• GND connected to GND of Esp32 on Baseboard
• A connected to NC of Wind Direction Sensor
• B connected to Data of Wind Direction Sensor

RTC DS3231

• SCL connected to GPIO22 of Esp32 on Baseboard
• SDA connected to GPIO21 of Esp32 on Baseboard
• VCC connected to VCC of Esp32 on Baseboard
• GND connected to GND of Esp32 on Baseboard

Wind Vane

• A0 connected to GPIO4 of Esp32 on Baseboard
• VCC connected to 5V of Esp32 on Baseboard
• GND connected to GND of Esp32 on Baseboard

16x2 I2C LCD

• SCL connected to GPIO22 of Esp32 on Baseboard
• SDA connected to GPIO21 of Esp32 on Baseboard
• VCC connected to VCC of Esp32 on Baseboard
• GND connected to GND of Esp32 on Baseboard

12V Power Supply

• + connected to POS of 2.1mm Barrel Jack with Terminal Block
• - connected to NEG of 2.1mm Barrel Jack with Terminal Block

2.1mm Male Connector

• + connected to POS of 2.1mm Barrel Jack with Terminal Block
• - connected to NEG of 2.1mm Barrel Jack with Terminal Block

2.1mm Barrel Jack with Terminal Block

• POS connected to + of 2.1mm Male Connector and VIN of Wind Direction Sensor
• NEG connected to - of 2.1mm Male Connector and GND of Wind Direction Sensor

Documented Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}
/*
Note:
GPIO Pin Assignments:
- 21 and 22: I2C bus for RTC module (0x68) and 16x2 LCD (0x27)
- 16 and 17: UART to RS485 module (RX, TX respectively)
- 4: NPNR output windspeed
- 19, 23, 18, 5: SD card module (MISO, MOSI, SCK, CS respectively)
- 21 and 22: EEPROM (0x57)
*/

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and documented code.