Build Instructions

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• 1

  PCB Assembly Process

  • The PCB assembly process begins by first adding solder paste to each component pad.
  • Next, we pick and organize each SMD component after positioning it in its proper location.
  • After that, we set the board on our PCB hotplate reflow hotplate, which increases the PCB's temperature from below to the point at which solder paste melts, allowing the components to be soldered to their pads.
  • Next, we placed the Push Switch and DIP8 Socket in their proper locations and used a soldering iron to solder the respective pads.

  The board is now complete.

• 2

  CODE and Flashing Process

  This is the basic code that we utilize for this project. Five I/O Pins of the Attiny85 (D0, D1, D2, D3, D4) are connected to each of the five outputs that we are using.

  This is a chaser sketch that exhibits a wave-like motion where light appears to be moving back and forth by sequentially toggling LEDs one after another.

  int pinsCount=5;                        // declaring the integer variable pinsCount
  int pins[] = {0,1,2,3,4};          // declaring the array pins[]
  void setup() {
  pinMode(0, OUTPUT);
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  }
  void loop() {
  for (int i=0; i<pinsCount; i=i+1){    // chasing right
  digitalWrite(pins[i], HIGH);         // switching the LED at index i on
  delay(70);                          // stopping the program for 100 milliseconds
  digitalWrite(pins[i], LOW);          // switching the LED at index i off
  }
  for (int i=pinsCount-1; i>0; i=i-1){   // chasing left (except the outer leds)
  digitalWrite(pins[i], HIGH);         // switching the LED at index i on
  delay(70);                          // stopping the program for 100 milliseconds
  digitalWrite(pins[i], LOW);          // switching the LED at index i off
  }
  }

  Flashing Process

  Here, we first install the Attiy85 on the DIP8 Socket of the shield. (Note that the Arduino Nano on the ISP Shield has the ISP sketch flashed on it.)

  • Next, we install the Attiny85 Core files for Arduino by going to the below link.

  https://github.com/SpenceKonde/ATTinyCore

  • After installing and setting up the core files, we go to tool menu and select the Attiny85 on board. We set the B.O.D to 1.8V and selected the programmer as "Arduino as ISP".
  • We then burn the bootloader, which takes up to 30 seconds to burn.
  • Once the bootloader has been burned, we select "Upload using programmer" from the sketch menu to upload the sketch to the Attiny85. The ISP flashing method does not support the regular upload method.
• 3

  Power Source for Flux Capacitor Board

  We use a DC-DC Buck converter module, which runs at 7–26V and can provide a constant 5V, to power the flux capacitor, a 5V device, from a 24V supply.

  Here, we connected the DC DC Buck module's output wires to the VCC and GND of the flux capacitor board after adding wires for the module's input and output using a soldering iron.

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