Circuit Documentation

Summary

The circuit in question is designed to interface an HC-SR04 Ultrasonic Sensor with an ESP8266 NodeMCU microcontroller. The ESP8266 NodeMCU is used to control the sensor and process its signals. Additionally, the circuit includes a resistor, an LED, and a piezo buzzer for indication purposes. The LED and buzzer are controlled by the ESP8266 NodeMCU to provide visual and audible feedback based on the sensor readings.

Component List

HC-SR04 Ultrasonic Sensor

• Description: A sensor that measures distance by emitting ultrasonic waves and measuring the time taken for the echo to return.
• Pins: VCC, TRIG, ECHO, GND

ESP8266 NodeMCU

• Description: A Wi-Fi enabled microcontroller that is capable of executing user-defined programs and interfacing with various sensors and actuators.
• Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

Resistor

• Description: A passive two-terminal electrical component that implements electrical resistance as a circuit element.
• Properties: 330 Ohms

Piezo Buzzer

• Description: An electronic device that emits a tone when an electric current is passed through it.
• Pins: pin 1, pin 2

LED: Two Pin (red)

• Description: A red light-emitting diode that emits light when a current flows through it.
• Pins: cathode, anode

Wiring Details

HC-SR04 Ultrasonic Sensor

• VCC connected to ESP8266 NodeMCU VIN
• TRIG connected to ESP8266 NodeMCU D6
• ECHO connected to ESP8266 NodeMCU D5
• GND connected to common ground net

ESP8266 NodeMCU

• D3 connected to one end of the Resistor
• GND connected to common ground net
• VIN connected to HC-SR04 Ultrasonic Sensor VCC
• D6 connected to HC-SR04 Ultrasonic Sensor TRIG
• D5 connected to HC-SR04 Ultrasonic Sensor ECHO
• D4 connected to Piezo Buzzer pin 1

Resistor

• pin1 connected to ESP8266 NodeMCU D3
• pin2 connected to LED anode

Piezo Buzzer

• pin 1 connected to ESP8266 NodeMCU D4
• pin 2 connected to common ground net

LED: Two Pin (red)

• cathode connected to common ground net
• anode connected to one end of the Resistor

Documented Code

No code has been provided for the microcontroller. The documentation of the code would typically include a description of the functionality, setup, and main loop, along with comments explaining the purpose of each section of the code. Since no code is available, this section cannot be completed.