This project started in 2009 as a way to learn how to program a microcontroller to run two DC motors.
After experimenting with the motors and controlling the tank with the computer keyboard I decided to take it a step further and design its own custom printed circuit board. I used a program called Eagle PCB and built a board that combined GPS, Xbee wireless, and its own motor control board built in. With the combination of GPS and a compass module I can create a code that allows the tank to roam by itself and navigate different GPS waypoints that I program into the script.
The PCB schematic:
-L298 Bridge Driver
-EM406 GPS
-XBEE
-FTDI Programmer
-Lithium Battery
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MQ-3 Alcohol Sensor
This code detects the amount of alcohol when someone breathes into it and displays a value that rises the higher the alcohol content.
Alcohol Detector Code:
int Reading;
int Threshold = 105;
void setup(){
Serial.begin(9600);
}
void loop(){
Reading = analogRead(0);
Reading = map(Reading, 0, 1023, 0, 254);
if(Reading >=Threshold){
delay(300);
Serial.println(Reading, DEC);
}
}
