Circuit Documentation

Summary of the Circuit

This circuit is designed to control a DC motor using a NodeMCU V3 ESP8266 microcontroller and a 2-channel relay module. The power for the circuit is provided by a LiPoly Battery (1300mAh), which is stepped down to a suitable voltage for the NodeMCU and relay module by an XL4015 5A DC Buck Step-down converter. The NodeMCU controls the relay module, which in turn controls the power supplied to the DC motor. The circuit does not include any embedded code as none was provided.

Component List

NodeMCU V3 ESP8266

• A microcontroller board based on the ESP8266 chip, featuring WiFi capability and a variety of digital and analog pins.

LiPoly Battery (1300mAh)

• A lithium polymer battery that provides a power source for the circuit.

2 Channel Relay Module

• A module with two relays that can be used to control high power devices such as motors.

XL4015 5A DC Buck Step-down Converter

• A DC-DC step-down (buck) converter capable of handling up to 5A of current, used to reduce the voltage from the battery to a level suitable for the NodeMCU and relay module.

DC Motor

• A simple DC motor that can be controlled by the relay module to turn on or off.

Wiring Details

NodeMCU V3 ESP8266

• Vin connected to the output voltage of the XL4015 step-down converter.
• GND connected to the ground of the XL4015 step-down converter.
• D1 connected to IN 1 on the 2 channel relay module.
• D2 connected to IN 2 on the 2 channel relay module.

LiPoly Battery (1300mAh)

• positive connected to Input + on the XL4015 step-down converter and N.C. 2 on the 2 channel relay module.
• negative connected to Input - on the XL4015 step-down converter, N.O. 2, and N.O. 1 on the 2 channel relay module.

2 Channel Relay Module

• VCC+ connected to the output voltage of the XL4015 step-down converter.
• VCC- (GND) connected to the ground of the XL4015 step-down converter.
• IN 1 controlled by D1 on the NodeMCU.
• IN 2 controlled by D2 on the NodeMCU.
• N.O. 1 and N.O. 2 connected to the negative of the LiPoly Battery.
• COM 1 connected to pin 1 of the DC Motor.
• COM 2 and N.C. 1 are not connected to any other components in the circuit.
• N.C. 2 connected to the positive of the LiPoly Battery and pin 2 of the DC Motor.

XL4015 5A DC Buck Step-down Converter

• Input + connected to the positive of the LiPoly Battery.
• Input - connected to the negative of the LiPoly Battery.
• Output + connected to VCC+ on the 2 channel relay module and Vin on the NodeMCU.
• Output - connected to VCC- (GND) on the 2 channel relay module and GND on the NodeMCU.

DC Motor

• pin 1 connected to COM 1 on the 2 channel relay module.
• pin 2 connected to N.C. 2 on the 2 channel relay module and the positive of the LiPoly Battery.

Documented Code

No code was provided for the microcontroller. If code is later provided, it should be documented here with explanations of how it interacts with the hardware components, including setup, main loop, and any functions or libraries used to control the relay module and, by extension, the DC motor.