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SAFESTOP (Instructable)
A step-by-step guide on how to make this project.
THINGS YOU WILL NEED
DragonBoard-410c
Mezzanine Shield
4 LED’s
4 push bottons
4 1 Kohm resistances
4 220 ohm resistances
Jumpers
MAKE SURE YOU’RE CONNECTED TO A NETWORK
Click on the wireless network indicator and select the appropriate wireless network.
GET YOUR DRAGONBOARD UP TO DATE
To install the new libraries and software, you will have to open a terminal window, which
is located in Start -> System Tools -> LXTerminal (or UXTerm, or XTerm).
Then type this code (without the $ sign):
$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get dist-upgrade
INSTALL EXTRA TOOL PACKAGES
In order to use the IDE, we’ll install the Debian packages for the standard Linux
development tools, including the Arduino toolchain.
$ sudo apt-get install arduino-mk arduino git build-essential autoconf libtool swig3.0
python-dev nodejs-dev cmake pkg-config libpcre3-dev
CONFIGURE THE SOFTWARE
This is to fetch the 96boards-tools package and install the provided configuration files:
$ sudo adduser linaro i2c # Allow the normal user to perform i2c operations
$ git clone https://github.com/96boards/96boards-tools
$ sudo cp 96boards-tools/70-96boards-common.rules /etc/udev/rules.d/
Now you need to edit/create a shell script in /etc/profile.d the shell script file name is:
96boards-sensors.sh and it might already exist, or it might not.
Then type this code:
$vim /etc/profile.d/96boards-sensors.sh
export JAVA_TOOL_OPTIONS="-Dgnu.io.rxtx.SerialPorts=/dev/tty96B0"
export MONITOR_PORT=/dev/tty96B0
export PYTHONPATH="$PYTHONPATH:/usr/local/lib/python2.7/site-packages"
Save and exit the editor
Copy this file one other place on the file system
$ sudo cp /etc/profile.d/96boards-sensors.sh /etc/X11/Xsession.d/96boards-sensors
Now reboot the system to pick up all the changes
$ sudo reboot
Once you are back from the reboot, the Arduino IDE should be installed now. Check on the
‘Start’ button (lower left corner of the desktop), then “Programming” tab, and click on the
Arduino IDE.
And now you have to set everything like this on the Arduino IDE:
Check the Tools menu option.
Tools->Board should be set to Arduino Uno
Tools->Serial Port should be set to /dev/tty96B0
Tools->Programmer should be set to AVRISP mkII or AVR ISP
With all these steps you are now ready to program on Arduino, if you want to test it out,
you can click on File->Examples->Basics->Blink option
You should be able to compile it and upload it without any problems on the Mezzanine
Shield.
ARDUINO CODE
This will be the code used on the project. The codes simulates a situation where if a car
arrives first to the stop sign, the other 3 cars coming on the other sides will be warned with
a LED light that a car is near to cross the street so they have to take more precautions. If
many cars arrive at the same time, the first one that arrived will be the first to cross, then
the second one and so on.
const int buttonPin1 = 2; // the number of the pushbutton pin
const int buttonPin2 = 3;
const int buttonPin3 = 4;
const int buttonPin4 = 5;
const int ledPin1 = 8; // the number of the LED pin
const int ledPin2 = 9;
const int ledPin3 = 10;
const int ledPin4 = 11;
// variables will change:
int buttonState1 = 0; // variable for reading the pushbutton status
int buttonState2 = 0;
int buttonState3 = 0;
int buttonState4 = 0;
void setup() {
// initialize the LED pin as an output:
pinMode(ledPin1, OUTPUT);
pinMode(ledPin2, OUTPUT);
pinMode(ledPin3, OUTPUT);
pinMode(ledPin4, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin1, INPUT);
pinMode(buttonPin2, INPUT);
pinMode(buttonPin3, INPUT);
pinMode(buttonPin4, INPUT);
}
void loop() {
// read the state of the pushbutton value:
buttonState1 = digitalRead(buttonPin1);
buttonState2 = digitalRead(buttonPin2);
buttonState3 = digitalRead(buttonPin3);
buttonState4 = digitalRead(buttonPin4);
// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState1 == HIGH && buttonState2 == LOW && buttonState3 == LOW &&
buttonState4 == LOW) {
// turn LED on:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
delay(2000);
}
else if (buttonState1 == LOW && buttonState2 == HIGH && buttonState3 == LOW &&
buttonState4 == LOW) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
delay(2000);
}
else if (buttonState1 == LOW && buttonState2 == LOW && buttonState3 == HIGH &&
buttonState4 == LOW) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, LOW);
digitalWrite(ledPin4, HIGH);
delay(2000);
}
else if (buttonState1 == LOW && buttonState2 == LOW && buttonState3 == LOW &&
buttonState4 == HIGH) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, LOW);
delay(2000);
}
else if (buttonState1 == HIGH && buttonState2 == HIGH && buttonState3 == LOW &&
buttonState4 == LOW) {
// turn LED on:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
delay(1000);
}
else if (buttonState1 == LOW && buttonState2 == HIGH && buttonState3 == HIGH &&
buttonState4 == LOW) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
delay(1000);
}
else if (buttonState1 == LOW && buttonState2 == LOW && buttonState3 == HIGH &&
buttonState4 == HIGH) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, LOW);
digitalWrite(ledPin4, HIGH);
delay(1000);
}
else if (buttonState1 == HIGH && buttonState2 == LOW && buttonState3 == LOW &&
buttonState4 == HIGH) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, LOW);
delay(1000);
}
else if (buttonState1 == HIGH && buttonState2 == HIGH && buttonState3 == HIGH
&& buttonState4 == LOW) {
// turn LED on:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
delay(1000);
}
else if (buttonState1 == LOW && buttonState2 == HIGH && buttonState3 == HIGH &&
buttonState4 == HIGH) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
delay(1000);
}
else if (buttonState1 == HIGH && buttonState2 == LOW && buttonState3 == HIGH &&
buttonState4 == HIGH) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, LOW);
digitalWrite(ledPin4, HIGH);
delay(1000);
}
else if (buttonState1 == HIGH && buttonState2 == HIGH && buttonState3 == LOW &&
buttonState4 == HIGH) {
// turn LED on:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, LOW);
delay(1000);
}
else {
// turn LED on:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, LOW);
digitalWrite(ledPin4, LOW);
}
}
CIRCUIT
This is what the circuit will look like
Tip: if you have problems to see the connections, you can check the pins used in the code)
MAKING THE MODEL
For this project we used SolidWorks to create a template of the model to cut it with a laser
machine cutter. You are free to decide how to make the model.
After cutting all the templates, the result was ready to just be assembly and painted.
This was the final result (with the built-in circuit)
