Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 microcontroller, various sensors, a display module, a stepper motor driver, a buzzer, and a fan. The circuit is designed to interface with multiple sensors and output devices, providing a comprehensive system for data acquisition and display.

Component List

1. ESP32 38 PINS

   • Description: A versatile microcontroller with Wi-Fi and Bluetooth capabilities.
   • Pins: GND, 23, 22/SCL, 1, 2, 21/SDA, 19, 18, 5, 17/TX2, 16/RX2, 4, 0, 15, D1, D0, CLK, 3V3, EN, VP, VN, 34, 35, 32, 33, 25, 26, 27, 14, 12, 13, D2, D3, 11, 5V/VIN

2. DHT22

   • Description: A digital temperature and humidity sensor.
   • Pins: +, Out, -

3. HX711 Weighing Sensor Module

   • Description: A precision 24-bit analog-to-digital converter (ADC) designed for weigh scales and industrial control applications.
   • Pins: B-, B+, A-, A+, E-, E+, VCC, CK/TX, DO/RX, GND

4. DS18B20

   • Description: A digital thermometer providing 9-bit to 12-bit Celsius temperature measurements.
   • Pins: OUTPUT, VCC 3.3V-5V DC, GND

5. Buzzer

   • Description: An audio signaling device.
   • Pins: PIN, GND

6. TB660 Stepper Motor Driver

   • Description: A driver for controlling stepper motors.
   • Pins: ENA - (ENA), ENA+ (+5V), DIR - (DIR), DIR+ (+5V), PUL - (PUL), VCC, GND, A+, A-, B+, B-, PUL+ (+5V)

7. Adafruit TFT 1.8 inch 160x128 w microSD

   • Description: A small TFT display with microSD card slot.
   • Pins: LITE, MISO, SCLK, MOSI, TFTCS, CARDCS, TFTDC, RESET, +5V, GND

8. Fan

   • Description: A cooling fan.
   • Pins: GND, 5V

9. MH-Z19B

   • Description: A CO2 sensor.
   • Pins: HD, TX, RX, V0, PWM, GND, Vin

10. Power Supply 24 VDC

    • Description: A power supply unit providing 24V DC.
    • Pins: L, N, E, V+, V-

Wiring Details

ESP32 38 PINS

• GND: Connected to GND of MH-Z19B, HX711 Weighing Sensor Module, Adafruit TFT 1.8 inch 160x128 w microSD, DS18B20, Buzzer, Fan, and DHT22.
• 23: Connected to MOSI of Adafruit TFT 1.8 inch 160x128 w microSD.
• 19: Connected to MISO of Adafruit TFT 1.8 inch 160x128 w microSD.
• 18: Connected to SCLK of Adafruit TFT 1.8 inch 160x128 w microSD.
• 5: Connected to TFTCS of Adafruit TFT 1.8 inch 160x128 w microSD.
• 17/TX2: Connected to RX of MH-Z19B and CK/TX of HX711 Weighing Sensor Module.
• 16/RX2: Connected to TX of MH-Z19B and DO/RX of HX711 Weighing Sensor Module.
• 4: Connected to CARDCS of Adafruit TFT 1.8 inch 160x128 w microSD.
• 0: Connected to RESET of Adafruit TFT 1.8 inch 160x128 w microSD.
• 2: Connected to TFTDC of Adafruit TFT 1.8 inch 160x128 w microSD.
• 15: Connected to OUTPUT of DS18B20.
• 3V3: Connected to VCC of DS18B20, ENA+ of TB660 Stepper Motor Driver, VCC of HX711 Weighing Sensor Module, + of DHT22, and LITE of Adafruit TFT 1.8 inch 160x128 w microSD.
• VN: Connected to Vin of MH-Z19B.
• 14: Connected to PWM of MH-Z19B and Out of DHT22.
• 13: Connected to PIN of Buzzer.
• 5V/VIN: Connected to 5V of Fan.

DHT22

• +: Connected to 3V3 of ESP32 38 PINS.
• Out: Connected to 14 of ESP32 38 PINS.
• -: Connected to GND of ESP32 38 PINS.

HX711 Weighing Sensor Module

• GND: Connected to GND of ESP32 38 PINS.
• VCC: Connected to 3V3 of ESP32 38 PINS.
• CK/TX: Connected to 17/TX2 of ESP32 38 PINS.
• DO/RX: Connected to 16/RX2 of ESP32 38 PINS.

DS18B20

• OUTPUT: Connected to 15 of ESP32 38 PINS.
• VCC 3.3V-5V DC: Connected to 3V3 of ESP32 38 PINS.
• GND: Connected to GND of ESP32 38 PINS.

Buzzer

• PIN: Connected to 13 of ESP32 38 PINS.
• GND: Connected to GND of ESP32 38 PINS.

TB660 Stepper Motor Driver

• ENA+ (+5V): Connected to 3V3 of ESP32 38 PINS.

Adafruit TFT 1.8 inch 160x128 w microSD

• GND: Connected to GND of ESP32 38 PINS.
• MOSI: Connected to 23 of ESP32 38 PINS.
• MISO: Connected to 19 of ESP32 38 PINS.
• SCLK: Connected to 18 of ESP32 38 PINS.
• TFTCS: Connected to 5 of ESP32 38 PINS.
• CARDCS: Connected to 4 of ESP32 38 PINS.
• TFTDC: Connected to 2 of ESP32 38 PINS.
• RESET: Connected to 0 of ESP32 38 PINS.
• LITE: Connected to 3V3 of ESP32 38 PINS.

Fan

• GND: Connected to GND of ESP32 38 PINS.
• 5V: Connected to 5V/VIN of ESP32 38 PINS.

MH-Z19B

• GND: Connected to GND of ESP32 38 PINS.
• RX: Connected to 17/TX2 of ESP32 38 PINS.
• TX: Connected to 16/RX2 of ESP32 38 PINS.
• Vin: Connected to VN of ESP32 38 PINS.
• PWM: Connected to 14 of ESP32 38 PINS.

Code

No code is provided for this circuit.

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This document provides a comprehensive overview of the circuit, including a detailed list of components and their wiring connections. This should serve as a useful reference for understanding and replicating the circuit.