Circuit Documentation

Summary

This circuit integrates a variety of components including a Raspberry Pi 4B, sensors (DS18B20, AHT10, Adafruit ADXL345, SW-420 Vibration Sensor), a TFT LCD Display (ST7735S), multiple HX711 Bridge Sensor Interfaces with corresponding Load Cells, a ULN2003A breakout board, a servo motor (MG996R), PTCs for circuit protection, and a power supply module. The Raspberry Pi 4B serves as the central processing unit, interfacing with the sensors and display, and controlling the servo motor through GPIO pins. The HX711 interfaces are used to digitize the signals from the load cells, which are likely used for weight measurement. The circuit is powered by a 12V 5A power supply, with voltage regulation provided by the MB102 Breadboard Power Supply Module and the Raspberry Pi's onboard voltage regulators.

Component List

Raspberry Pi 4B

• Microcontroller and central processing unit of the circuit.
• Equipped with multiple GPIO pins for interfacing with other components.

DS18B20

• A digital temperature sensor that communicates over a one-wire interface.

Resistor (4.7k Ohms)

• Used as a pull-up resistor for the DS18B20 data line.

Load Cell - Red/white/black/green

• Transducers that convert force into an electrical signal.

TFT LCD Display ST7735S

• A small display for visual output from the Raspberry Pi.

PTC (Positive Temperature Coefficient)

• Protective devices that limit current in the event of a fault.

SW-420 Vibration Sensor

• A sensor that detects vibrations and outputs a digital signal.

HX711 - Bridge Sensor Interface

• An ADC converter for reading load cells.

POWER SUPPLY 12V 5AMP

• Provides the main power to the circuit.

AHT10

• A high precision temperature and humidity sensor.

Adafruit ADXL345

• A 3-axis accelerometer for motion detection.

ULN2003A breakout board

• A driver board for controlling stepper motors or other loads.

MG996R

• A high-torque servo motor.

MB102 Breadboard Power Supply Module 3.3V/5V

• A module that provides regulated power to the breadboard.

Wiring Details

Raspberry Pi 4B

• 3V3 powers the DS18B20, AHT10, and TFT LCD Display.
• 5V powers the ULN2003A breakout board and SW-420 Vibration Sensor.
• GPIO2 (SDA) is connected to the AHT10 and Adafruit ADXL345 for I2C communication.
• GPIO3 (SCL) is also connected to the AHT10 and Adafruit ADXL345 for I2C communication.
• GPIO4 is connected to the DS18B20 data line through a 4.7k Ohm resistor.
• GPIO14, GPIO15, GPIO18, GPIO26 are connected to the ULN2003A breakout board inputs.
• GPIO17 is connected to the SW-420 Vibration Sensor digital output.
• GPIO22, GPIO23, GPIO24, GPIO27, GPIO5, GPIO6 are connected to the HX711 data and clock inputs.
• GPIO8, GPIO10, GPIO11, GPIO25, GPIO16, GPIO21 are connected to the TFT LCD Display for SPI communication and control.
• Multiple GND pins are used for grounding various components.

DS18B20

• VDD to 3.3V power.
• DQ to Raspberry Pi GPIO4 with a 4.7k Ohm pull-up resistor to 3.3V.
• GND to ground.

Resistor (4.7k Ohms)

• One end to DS18B20 DQ and the other end to 3.3V.

Load Cells

• E+, E-, A-, A+ connected to corresponding HX711 inputs.

TFT LCD Display ST7735S

• Vcc to 3.3V power.
• GND to ground.
• CS, RESET, A0, SDA, SCK to corresponding Raspberry Pi GPIO pins for SPI communication.

PTCs

• Neutral lines connected together and to the GND (DC) of the power supply.
• Live lines connected together and to the 12V-24V Output (DC) of the power supply.

SW-420 Vibration Sensor

• vcc to 5V power.
• Ground to ground.
• Digital output to Raspberry Pi GPIO17.

HX711 - Bridge Sensor Interface

• 3.3/3.5V Supply to 3.3V power.
• GND - GROUND to ground.
• E+, E-, A-, A+ to corresponding Load Cell wires.
• DATA (OUT) and SCK - CLOCK (IN) to corresponding Raspberry Pi GPIO pins.

POWER SUPPLY 12V 5AMP

• 220V Positive Pole (AC) and 220V Negative Pole (AC) to AC power source.
• GND (DC) to PTC Neutral.
• 12V-24V Output (DC) to PTC Live.

AHT10

• VIN to 3.3V power.
• GND to ground.
• SDA and SCL to corresponding Raspberry Pi GPIO pins for I2C communication.

Adafruit ADXL345

• VIN to 3.3V power.
• GND to ground.
• SDA/SDIO and SCL to corresponding Raspberry Pi GPIO pins for I2C communication.

ULN2003A breakout board

• +5V to 5V power.
• 0V to ground.
• In 1, In 2, In 3, In 4 to corresponding Raspberry Pi GPIO pins.

MG996R

• VCC to 5V power.
• GND to ground.
• SIG to Raspberry Pi GPIO21.

MB102 Breadboard Power Supply Module 3.3V/5V

• GND to ground.
• 3.3V and 5v to corresponding components requiring regulated power.

Documented Code

There is no code provided for the microcontrollers in the circuit. The Raspberry Pi 4B would typically be programmed using Python, C++, or another suitable programming language to interface with the connected sensors, display, and other components. The code would handle data acquisition, processing, and output, as well as control signals for the servo motor and other actuators.