Circuit Documentation

Summary

This circuit integrates a Raspberry Pi 3B as the central processing unit, interfacing with multiple sensors and peripherals to perform various tasks. The circuit includes ultrasonic sensors (HC-SR04) for distance measurement, infrared sensors for object detection, servomotors (SG90) for movement, an I2C LCD display for user interface, a TTL Serial JPEG Camera for image capture, a SIM800L module for cellular communication, and an IO expander to increase the number of GPIOs available on the Raspberry Pi. The circuit is powered by the Raspberry Pi's 3.3V and 5V pins, with ground connections distributed across the components.

Component List

Raspberry Pi 3B

• A single-board computer with multiple GPIO pins used for interfacing with various sensors and modules.

HC-SR04 Ultrasonic Sensor

• Ultrasonic distance measuring module that provides 2cm to 400cm non-contact measurement functionality.

TTL Serial JPEG Camera

• A camera module that captures JPEG images and sends them over a serial connection.

IO Expander

• A device that expands the number of IO pins available from the Raspberry Pi, interfacing via I2C.

IR Sensor

• An infrared sensor used for object detection.

Servomotor SG90

• A small and lightweight servo that is used for precise control of mechanical movement.

LCD Display 20x4 I2C

• An alphanumeric liquid crystal display that allows for the display of text on 4 lines of 20 characters each, interfaced via I2C.

SIM800L

• A GSM/GPRS module that allows for cellular communication including SMS and data.

Wiring Details

Raspberry Pi 3B

• 3v3 connected to IO expander VCC and SIM800L VCC
• GPIO2 (SDA) connected to IO expander SDA and LCD Display SDA
• GPIO3 (SCL) connected to IO expander SCL and LCD Display SCL
• GND connected to IO expander GND, TTL Serial JPEG Camera GND, SIM800L GND, Servomotors GND, IR sensors GND, and HC-SR04 sensors GND
• GPIO17 connected to Servomotors SIG and IR sensor out
• GPIO27 connected to IR sensor out
• GPIO22 connected to IR sensor out
• GPIO15 (RX) connected to TTL Serial JPEG Camera TX and SIM800L RXD
• GPIO14 (TX) connected to TTL Serial JPEG Camera RX and SIM800L TXD
• 5V connected to TTL Serial JPEG Camera 5V, Servomotors VCC, IR sensors VCC, and HC-SR04 sensors VCC

HC-SR04 Ultrasonic Sensor

• VCC connected to Raspberry Pi 5V
• GND connected to Raspberry Pi GND
• TRIG and ECHO pins connected to various IO expander pins

TTL Serial JPEG Camera

• GND connected to Raspberry Pi GND
• RX connected to Raspberry Pi GPIO15
• TX connected to Raspberry Pi GPIO14
• 5V connected to Raspberry Pi 5V

IO Expander

• VCC connected to Raspberry Pi 3v3
• GND connected to Raspberry Pi GND
• SDA connected to Raspberry Pi GPIO2
• SCL connected to Raspberry Pi GPIO3
• P01, P03, P05, P06, P00, P02 connected to HC-SR04 TRIG pins
• P16, P14, P13, P12, P17, P15 connected to HC-SR04 ECHO pins

IR Sensor

• out connected to Raspberry Pi GPIO17, GPIO27, GPIO22
• gnd connected to Raspberry Pi GND
• vcc connected to Raspberry Pi 5V

Servomotor SG90

• SIG connected to Raspberry Pi GPIO17
• VCC connected to Raspberry Pi 5V
• GND connected to Raspberry Pi GND

LCD Display 20x4 I2C

• SCL connected to Raspberry Pi GPIO3
• SDA connected to Raspberry Pi GPIO2
• VCC connected to Raspberry Pi 5V
• GND connected to Raspberry Pi GND

SIM800L

• VCC connected to Raspberry Pi 3v3
• GND connected to Raspberry Pi GND
• RXD connected to Raspberry Pi GPIO14
• TXD connected to Raspberry Pi GPIO15

Documented Code

No code was provided for the microcontrollers in the circuit. The documentation of the code would typically include descriptions of the functionality implemented, setup and loop functions, and any libraries used for interfacing with the hardware components. It would also include comments within the code to explain the purpose of each section and the logic behind it.