Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an HC-SR04 Ultrasonic Sensor, a red LED, a resistor, a 1N4007 rectifier diode, a 18650 Li-ion battery, a USB plug, and a NodeMCU V3 ESP8266 microcontroller. The circuit is designed to interface the ultrasonic sensor with the NodeMCU for distance measurement, and it includes an LED indicator powered through a resistor. The power supply is managed through a 18650 Li-ion battery and a USB plug.

Component List

1. HC-SR04 Ultrasonic Sensor

   • Pins: VCC, TRIG, ECHO, GND
   • Description: Ultrasonic distance sensor used for measuring distance by sending and receiving ultrasonic waves.

2. LED: Two Pin (red)

   • Pins: Cathode, Anode
   • Description: Red LED used as an indicator.

3. Resistor

   • Pins: Pin1, Pin2
   • Description: 220 Ohms resistor used to limit current through the LED.
   • Properties:
     • Resistance: 220 Ohms

4. 1N4007 Rectifier Diode

   • Pins: Cathode, Anode
   • Description: Diode used for rectification and protection.

5. 18650 Li-ion Battery

   • Pins: +, -
   • Description: Rechargeable lithium-ion battery used as the power source.

6. USB Plug

   • Pins: GND, D+, D-, 5V+, Out
   • Description: USB plug used for power supply and data communication.

7. NodeMCU V3 ESP8266

   • Pins: A0, GND, VU, S3, S2, S1, SC, S0, SK, 3V3, EN, RST, Vin, D0, D1, D2, D3, D4, D5, D6, D7, D8, RX, TX
   • Description: Microcontroller with Wi-Fi capabilities used for controlling the circuit and interfacing with the ultrasonic sensor.

Wiring Details

HC-SR04 Ultrasonic Sensor

• VCC is connected to the Vin pin of the NodeMCU V3 ESP8266 and the Cathode pin of the 1N4007 Rectifier Diode.
• TRIG is connected to the D6 pin of the NodeMCU V3 ESP8266.
• ECHO is connected to the D5 pin of the NodeMCU V3 ESP8266.
• GND is connected to the GND pin of the NodeMCU V3 ESP8266.

LED: Two Pin (red)

• Cathode is connected to the GND pin of the NodeMCU V3 ESP8266, the - pin of the 18650 Li-ion Battery, the pin2 of the Resistor, and the GND pin of the USB Plug.
• Anode is connected to the pin1 of the Resistor and the D0 pin of the NodeMCU V3 ESP8266.

Resistor

• Pin1 is connected to the Anode of the LED and the D0 pin of the NodeMCU V3 ESP8266.
• Pin2 is connected to the Cathode of the LED, the GND pin of the NodeMCU V3 ESP8266, the - pin of the 18650 Li-ion Battery, and the GND pin of the USB Plug.

1N4007 Rectifier Diode

• Cathode is connected to the Vin pin of the NodeMCU V3 ESP8266 and the VCC pin of the HC-SR04 Ultrasonic Sensor.
• Anode is connected to the + pin of the 18650 Li-ion Battery and the 5V+ pin of the USB Plug.

18650 Li-ion Battery

• + is connected to the Anode of the 1N4007 Rectifier Diode and the 5V+ pin of the USB Plug.
• - is connected to the GND pin of the NodeMCU V3 ESP8266, the pin2 of the Resistor, the Cathode of the LED, and the GND pin of the USB Plug.

USB Plug

• 5V+ is connected to the Anode of the 1N4007 Rectifier Diode and the + pin of the 18650 Li-ion Battery.
• GND is connected to the GND pin of the NodeMCU V3 ESP8266, the pin2 of the Resistor, the Cathode of the LED, and the - pin of the 18650 Li-ion Battery.

NodeMCU V3 ESP8266

• Vin is connected to the Cathode of the 1N4007 Rectifier Diode and the VCC pin of the HC-SR04 Ultrasonic Sensor.
• D6 is connected to the TRIG pin of the HC-SR04 Ultrasonic Sensor.
• D5 is connected to the ECHO pin of the HC-SR04 Ultrasonic Sensor.
• GND is connected to the GND pin of the HC-SR04 Ultrasonic Sensor, the pin2 of the Resistor, the Cathode of the LED, the - pin of the 18650 Li-ion Battery, and the GND pin of the USB Plug.
• D0 is connected to the pin1 of the Resistor and the Anode of the LED.

Code

There is no code provided for the microcontrollers in this circuit.