Project Goal

Ability Calculate user's acceleration Firebend when the punch is strong enough Requirement Safe Rechargable Not too bunky

Schematics

Made up of 4 parts and 2 power sources The brain (I used Arduino Uno and accelerometer MPU6050) The fire trigger (arc lighter) The air container (made up of different pipes) The gear display (LEDs) Low current power source (4 standard AA batteries) High current power source (4 li-ion batteries (1.5V - 3000mAh) )

Materials

The air container NPT barb (8mm) x1 male-to-male reducer (12-21 mm) x2 female-to-female connector(21mm) x3 male-to-male connector (21mm) x2 male-to-female reducer(12mm - 8mm) x1 electric valve 12mm x1 mechanical valve 12mm x1 The brain Arduino Uno x1 TIP41C transistor x1 Diode x1 MPU6050 x1         The fire trigger Arc lighter x1 10k Ohm resistor x1               The gear display button x1 LEDs x3 1k Ohm resistors x3

Mechanism

After every 0.05 seconds, module MPU6050 will update and return 1 acceleration value, Module will then compare current acceleration to previous value,if the result is grater than 1 (gear2) or 0.9(gear1), Arduino will then activate the fire trigger Fire bending consist of 2 process . First pin 7 of Arduino send PWM signal activate arc lighter, the same time, pin 4 of Arduino send signal to base of transistor allow bigger current (12V- 3000mAh power source) run accross collector and emitter of transistor activate electric valve and release burning gas, the burning gas combine with the arc from arc lighter ignite and create the effect of firebending

Code

#include < MPU6050_tockn.h > #include < Wire.h > MPU6050 Zuko(Wire); long timer = 0; int lighter = 7; int gas = 4; int button = 8; int gadget =1; bool state = false; void setup(){ Wire.begin(); Zuko.begin(); pinMode(gas, OUTPUT); pinMode(lighter, OUTPUT); pinMode(button, INPUT); pinMode(9, OUTPUT); pinMode(10, OUTPUT); pinMode(11, OUTPUT); } void loop(){ Zuko.update(); if ( gadget > 3) // limit to 3 gear only gadget = gadget -3; if ( gadget ==1 ) Zuko.update(); digitalWrite(11,LOW); //change the gear light digitalWrite(9, HIGH); double num1; // variable to store the first acceleration if ( millis() - timer > 0){ // first check for (; Zuko.getAccX() > 5;){ // decline cases where acceleration is too fast to calculate Zuko.update() } num1 = Zuko.getAccX() / 10000000; //store first acceleration if ( millis() - timer > 50){ // second check Zuko.update(); } if ( Zuko.getAccX() - num1 > 0.9){ // check if it is a punch if ( state == false){ // avoid too many 'punch' per second that overload device digitalWrite(lighter, HIGH); digitalWrite(gas,HIGH); delay(50); digitalWrite(gas,LOW); digitalWrite(lighter,LOW) timer = millis() // reset checking process state = true; } else state= false; } } }} if (gadget == 2){ Zuko.update() digitalWrite(9,LOW); digitalWrite(10,HIGH); double num2; for (;Zuko.getAccZ > 5;) { Zuko.update(); } if ( millis() - timer > 0){ num2 = Zuko.getAccZ() / 10000000; if (millis() - timer > 50){ Zuko.update() for(;Zuko.getAccZ() > 5;) { Zuko.update() } if (abs(Zuko.getAccZ()-num2)>1) { digitalWrite(lighter,HIGH); digitalWrite(gas,HIGH) delay(50); digitalWrite(gas,LOW); digitalWrite(lighter,LOW); timer = millis() } } } }} if ( gadget == 3){ digitalWrite(10,LOW); digitalWrite(11,HIGH); } if ( digitalRead(button) == HIGH){ gadget++; delay(300); } }

Product