Build Instructions

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• 1

  PCB Assembly Process

  • Using a solder paste dispensing needle, we apply solder paste to each SMD component pad to begin the PCB assembly process.
  • Next, we added all the SMD components in their place using a ESD Tweeser.
  • The circuit was then placed on the Reflow Hotplate, which heats the PCB from below to the solder paste melting temperature. All SMD components are connected to their pads as soon as the PCB reaches the solder paste melting temperature, which is typically 200° C.
  • Turning the Board over, we started the THT Components assembly by first placing the Lithium ion cell holder using a solder iron.
  • Next, we solder the pads to secure the other THT components, such as the switch, JST connection, and USB Type C port, in their proper locations.
• 2

  Power Source

  We utilized a 3.7V 2000mAh Li-ion cell as the power supply, which was connected to the lithium cell holder in the proper polarity.

  After pressing the ON button and the device turns on, we measure the output voltage with a multimeter and observe that it is 5.1V, indicating that the circuit is working.

• 3

  CODE and DRY RUN

  We attached an XIAO M0 microcontroller to the circuit and uploaded the code below to see if it worked or not.

  The JST wire connector for the motor is then inserted into the circuit JST connector.

  const int motorPin1 = 0; // Pin connected to H-bridge input 1
  const int motorPin2 = 1; // Pin connected to H-bridge input 2
  const int ledCW = 3; // Pin connected to LED for clockwise direction
  const int ledCCW = 4; // Pin connected to LED for counterclockwise direction
  void setup() {
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  pinMode(ledCW, OUTPUT);
  pinMode(ledCCW, OUTPUT);
  }
  void loop() {
  // Turn motor ON in one direction (clockwise)
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(ledCW, HIGH); // Turn on CW LED
  digitalWrite(ledCCW, LOW); // Turn off CCW LED
  delay(3000); // Wait for 3 seconds
  // Change direction (counterclockwise)
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(ledCW, LOW); // Turn off CW LED
  digitalWrite(ledCCW, HIGH); // Turn on CCW LED
  delay(3000); // Wait for 3 seconds
  }

  This code controls an H-bridge motor driver to turn a motor in clockwise and counterclockwise directions for 3 seconds each. LEDs indicate the direction of the motor's rotation, with ledCW lighting up for clockwise and ledCCW lighting up for counterclockwise.

  The system is turned on and the motor begins to spin in a single direction after the power button is pressed. After three seconds, it reverses course for an additional three seconds, repeating the cycle.

  Now that the circuit is operational, we may proceed with the gearbox body assembly procedure.

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