Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes various components such as a MAX30102 sensor, an LCD TFT screen, a load cell, an ESP32 microcontroller, a stepper motor, and an HX711 weighing sensor module. The document includes a component list, wiring details, and code documentation.

Component List

MAX30102

• Description: A pulse oximeter and heart-rate sensor.
• Pins: VIN, SDA, SCL, GND, RD, IRD, INT
• Purpose in Circuit: Measures heart rate and blood oxygen levels.

LCD TFT screen ILI9488 HD

• Description: A high-definition LCD screen with touch capabilities.
• Pins: PEN, TDO, TDI, VCC (3.3~5V), GND, CS, RST, D/C, SDI(MOSI), SCK, BL, SDO(MISO), TCS, TCK
• Purpose in Circuit: Displays information and provides a user interface.

Load Cell - Red/white/black/green

• Description: A sensor used to measure weight.
• Pins: E+, A-, E-, A+
• Purpose in Circuit: Measures weight for various applications.

ESP32 on Baseboard

• Description: A microcontroller with Wi-Fi and Bluetooth capabilities.
• 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
• Purpose in Circuit: Acts as the main controller for the circuit, handling data processing and communication.

Stepper Motor One

• Description: A motor that moves in discrete steps, used for precise control.
• Pins: IN1, IN2, IN3, IN4, +, -
• Purpose in Circuit: Provides precise movement for mechanical components.

HX711 Weighing Sensor Module

• Description: A precision 24-bit analog-to-digital converter (ADC) designed for weigh scales.
• Pins: B-, B+, A-, A+, E-, E+, VCC, CK/TX, DO/RX, GND
• Purpose in Circuit: Converts the analog signal from the load cell to a digital signal for the microcontroller.

Wiring Details

MAX30102

• VIN: Connected to ESP32 pin 3V
• SDA: Connected to ESP32 pin GPIO12
• SCL: Connected to ESP32 pin GPIO13
• GND: Connected to ESP32 pin GND

LCD TFT screen ILI9488 HD

• VCC (3.3~5V): Connected to ESP32 pin 5V
• GND: Connected to ESP32 pin GND
• CS: Connected to ESP32 pin GPIO5
• RST: Connected to ESP32 pin GPIO18
• D/C: Connected to ESP32 pin GPIO19
• SDI(MOSI): Connected to ESP32 pin GPIO23
• SCK: Connected to ESP32 pin GPIO21
• BL: Connected to ESP32 pin GPIO3/RX

Load Cell - Red/white/black/green

• E+: Connected to HX711 pin E+
• A-: Connected to HX711 pin A-
• E-: Connected to HX711 pin E-
• A+: Connected to HX711 pin A+

ESP32 on Baseboard

• 3V: Connected to MAX30102 pin VIN, HX711 pin VCC
• GPIO12: Connected to MAX30102 pin SDA
• GPIO13: Connected to MAX30102 pin SCL
• GND: Connected to MAX30102 pin GND, HX711 pin GND, LCD TFT screen pin GND
• 5V: Connected to LCD TFT screen pin VCC (3.3~5V)
• GPIO5: Connected to LCD TFT screen pin CS
• GPIO18: Connected to LCD TFT screen pin RST
• GPIO19: Connected to LCD TFT screen pin D/C
• GPIO23: Connected to LCD TFT screen pin SDI(MOSI)
• GPIO21: Connected to LCD TFT screen pin SCK
• GPIO3/RX: Connected to LCD TFT screen pin BL
• GPIO17: Connected to Stepper Motor pin IN4
• GPIO16: Connected to Stepper Motor pin IN3
• GPIO4: Connected to Stepper Motor pin IN2
• GPIO0: Connected to Stepper Motor pin IN1
• GPIO2: Connected to HX711 pin CK/TX
• GPIO15: Connected to HX711 pin DO/RX

Stepper Motor One

• IN4: Connected to ESP32 pin GPIO17
• IN3: Connected to ESP32 pin GPIO16
• IN2: Connected to ESP32 pin GPIO4
• IN1: Connected to ESP32 pin GPIO0

HX711 Weighing Sensor Module

• E+: Connected to Load Cell pin E+
• A-: Connected to Load Cell pin A-
• E-: Connected to Load Cell pin E-
• A+: Connected to Load Cell pin A+
• VCC: Connected to ESP32 pin 3V
• CK/TX: Connected to ESP32 pin GPIO2
• DO/RX: Connected to ESP32 pin GPIO15
• GND: Connected to ESP32 pin GND

Code Documentation

No code is provided for this circuit.

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This document provides a comprehensive overview of the circuit, including the components used, their connections, and their purposes. This should serve as a useful reference for understanding and troubleshooting the circuit.