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Lowcost Wireless Rocket Launcher

About the project

This project allows to launch gunpowder rockets safely and with a lot of fun. (coutdown display with access code and sound).

Project info

Difficulty: Moderate

Platforms: SparkFun

Estimated time: 1 hour

Items used in this project

Hardware components

	kwmobile 3X Module Radio émetteur récepteur 433 MHz	x 1
	ARCELI 5pcs DC 3.3-5V Passif Bas Niveau Trigger Buzzer	x 1
	AZDelivery Matrix 4 x 4 Array Keypad Clavier	x 1
	AZDelivery I2C Serial Adapter Board Module Interface pour LCD Display 1602 et 2004	x 1
	12mm Bouton-poussoir à Verrouillage, Boutons Poussoir On-Off Autobloquant	x 1
	16x2 Character Display with I2C interface	x 1
	KLIMA rocket and igniters	x 1
	Switch Finger Guard, Honeywell 2 Position Standard Toggle Switches	x 1
	SparkFun 7-Segment Serial Display - Red	x 1
	Arduino UNO	x 2

View all

Software apps and online services

Solder Wire, Lead Free

Hand tools and fabrication machines

	Hot glue gun (generic)	x 1
	Soldering iron (generic)	x 1
	3D Printer (generic)	x 1

Story

I enjoy launching gun powder rockets with my son Thomas. This project allows to make automatic launches from a safe distance with lots of fun.

Caution: While the circuits are powered on, always stay at a safe distance from the rocket!

Schematics, diagrams and documents

Rocket launcher emitter

It's a box that displays the countdown with sounds. It sends a message to the receiver to trigger the launch at the end of the countdown.

Rocket launcher receiver

The receiver triggers the launch when it receives the launch signal from the emiter (end of coutdown).

CAD, enclosures and custom parts

Emitter box

3D drawing for the emitter enclosure

Go to download

Receiver box

Enclosure for the receiver

Go to download

Code

Emitter code

Manage the countdown and snds the message to the receiver to trigger the launch

#include <SoftwareSerial.h> //utilisation du port série pour l'afficheur numérique #include <LiquidCrystal_I2C.h> //utilisation de l'écran LCD sur bus I2C #include <VirtualWire.h> //utilisation d'une liaison radio 433Mhz #include <Wire.h> #include <Keypad_I2C.h> //utilisation du clavier sur bus I2C #include <Keypad.h> // These are the Arduino pins required to create a software serial // instance. We'll actually only use the TX pin. const int softwareTx = 5; const int softwareRx = 6; const String CodeSecret ="1212"; //Adresse I2C du clavier #define keypad_addr 0x20 //définition des touches du clavier const byte ROWS = 4; const byte COLS = 4; char keys[ROWS][COLS] = { {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} }; byte rowPins[ROWS] = {0,1,2,3}; //connect P0-P3 to the row R1-R4 pinouts of the keypad byte colPins[COLS] = {4,5,6,7}; //connect P4-P7 to the column C1-C4 pinouts of the keypad #define GoButton 7 //pin connecté au bouton GO #define Allumage 4 //pin connecté au relais allumeur #define Sirene 3 //pin connecté au buzzer #define TpsAlerte 60 //temps d'alerte avant mise à feu en secondes #define AllumImmin 20 //mise à feu imminente int FinSequence=0; SoftwareSerial s7s(softwareRx, softwareTx); LiquidCrystal_I2C lcd(0x27,16,2); Keypad_I2C I2C_Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS, keypad_addr, PCF8574); unsigned int counter = 0; // This variable will count up to 65k char tempString[10]; // Will be used with sprintf to create strings void setup() { pinMode(Sirene,OUTPUT); //Le pin connecté au buzzer est une sortie pinMode(GoButton, INPUT_PULLUP); //Le pin connecté au bouton armement est une entrée pinMode(Allumage,OUTPUT); //Sortie de commande du relais d'allumage vw_setup(2000); //initialisation radio vw_set_tx_pin(12); lcd.init(); lcd.cursor_on(); lcd.blink_on(); lcd.backlight(); lcd.setCursor(0,0); lcd.print("Initialisation.."); lcd.cursor_off(); lcd.blink_off(); // Must begin s7s software serial at the correct baud rate. // The default of the s7s is 9600. s7s.begin(9600); clearDisplay(); // Clears display, resets cursor s7s.print(" HI "); // Displays " HI " // Flash brightness values at the beginning setBrightness(0); // Lowest brightness delay(1500); setBrightness(127); // Medium brightness delay(1500); setBrightness(255); // High brightness delay(1500); // Clear the display before jumping into loop clearDisplay(); Wire.begin(); I2C_Keypad.begin(makeKeymap(keys)); Serial.begin(9600); } int i; int Chrono; String Code; String CodeReinit; void loop() { lcd.clear(); lcd.setCursor(0,0); lcd.print("Entrez code..."); while (Code != CodeSecret) //Attente de la saisie du code secret { //Put value of pressed key on keypad in key variable char key = I2C_Keypad.getKey(); if (key) { lcd.setCursor(0,1); lcd.print(key); Code=Code+key; if (key=='*') //reset de la saisie avec la touche "*" { Code=CodeReinit; } } } byte message[27]; //Message radio byte taille_message = 27; lcd.clear(); delay(500); lcd.setCursor(0,0); lcd.print("Attente"); lcd.setCursor(0,1); lcd.print("lancement..."); delay(500); lcd.clear(); lcd.setCursor(0,0); lcd.print("Evacuez zone et"); lcd.setCursor(0,1); lcd.print("armez la ligne"); delay(500); Chrono=TpsAlerte; while(!(digitalRead(GoButton))&&(Chrono>0)) //Compte à rebour { Chrono--; ShowTimer(); lcd.clear(); delay(100); lcd.setCursor(0,0); lcd.print("Sequence lancee"); lcd.setCursor(0,1); lcd.print("Evacuez la zone"); delay(100); if(Chrono<=AllumImmin) { tone(Sirene,300,700); //sirène à tempo. rapide delay(800); } else { tone(Sirene,500,400); //sirène à tempo. lent delay(1000); } } if(!digitalRead(GoButton)) //Si pas d'annulation de la séquence { tone(Sirene,100,100); //digitalWrite(Allumage,HIGH); //ALLUMAGE ! s7s.print("FEU "); //afficher "FEU " sur l'afficheur 7 segments lcd.clear(); lcd.setCursor(0,0); lcd.print("Mise a feu !"); //afficher "Mise a feu" sur la première ligne de l'écran LCD strcpy(message, "Feu"); //Message de mise à feu à transmettre par radio for (i=0; i<=10; i++) { vw_send(message, taille_message); //Transmission du message de mise à feu vw_wait_tx(); //Attente de la transmission delay(500); } } i=0; Chrono=0; pinMode(Sirene,INPUT_PULLUP); //Palliatif à buzzer trop sensible digitalWrite(Allumage,LOW); //Fin d'allumage } void ShowTimer() //Affcihage du temps restant sur l'afficheur 7 seguements { String seconds = String (Chrono, DEC); while(seconds.length()<4)seconds= "0" + seconds; //format to 4 numbers. s7s.print(seconds); //Write number of seconds left to display } // Send the clear display command (0x76) // This will clear the display and reset the cursor void clearDisplay() { s7s.write(0x76); // Clear display command } // Set the displays brightness. Should receive byte with the value // to set the brightness to // dimmest------------->brightest // 0--------127--------255 void setBrightness(byte value) { s7s.write(0x7A); // Set brightness command byte s7s.write(value); // brightness data byte }

Receiver code

Receives the launch order from the emitter

#include <VirtualWire.h> #define FEU 9 #define WATCHDOG 7 void setup() { pinMode(FEU, OUTPUT); pinMode(WATCHDOG, OUTPUT); // Serial.begin(9600); // Serial.println("start"); vw_setup(2000); vw_set_rx_pin(11); vw_rx_start(); } void loop() { byte message[27]; byte taille_message = 27; digitalWrite(FEU, LOW); digitalWrite(WATCHDOG, HIGH); vw_wait_rx(); if (vw_get_message(message, &taille_message)) { if (!strcmp((char*) message, "Feu")) //Si message "Feu" reçu activer la sortie FEU (sortie de mise à feu) { digitalWrite(FEU, HIGH); // Serial.println("message"); delay(2000); } else digitalWrite(FEU, LOW); } }

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Lowcost Wireless Rocket Launcher

About the project

Project info