Building Instructions -

• Ubuntu

-

• Electronics

Download button at the bottom.

This is a program we created for the LED strip display course.

#include <Adafruit_NeoPixel.h>

#define  LED_COUNT 20
#define  StripPin A2
#define  HallEffectSensorPin 6
#define  HallEffectGNDPin 5
#define  HallEffectVCCPin 4

int startSeconds = 20;
int startMinutes = 10;
int startHours = 1;

int secondsArrow;
int minutesArrow;
int hoursArrow;

int arrowPosition;

int hallSensorPastState = LOW;
int hallSensorRead;
int timeForOneRotation = 1;
unsigned long RPMTimer = millis();

Adafruit_NeoPixel leds = Adafruit_NeoPixel(LED_COUNT, StripPin, NEO_GRB + NEO_KHZ800);

int color[3] = {255, 100, 150};
int secondsColor[3] = {255, 0, 0};
int minutesColor[3] = {0, 255, 0};
int hoursColor[3] = {0, 0, 255};

void setup(){
  pinMode(HallEffectSensorPin, INPUT);
  pinMode(HallEffectGNDPin, OUTPUT);
  pinMode(HallEffectVCCPin, OUTPUT);
  digitalWrite(5, LOW);
  digitalWrite(HallEffectVCCPin, HIGH);

  leds.begin();
  leds.setPixelColor(19, color[0], Color[1], color[2]);
}

void loop(){
  RPMUpdate();
  ClearLedsWithoutTheLastOne();
  arrowPosition = StateFrom60();

  secondsArrow = ((int) floor(( millis() / 1000) + startSeconds) % 60);
  minutesArrow = ((int) floor(( millis() / 60000) + startMinutes) % 60);
  hoursArrow = ((int) floor(( millis() / 3600000) + startHours) % 12) * 5;

  if (arrowPosition == secondsArrow){
    for (int i = 0; i < LED_COUNT - 3; i ++){
      leds.setPixelColor(i, secondsColor[0], secondsColor[1], secondsColor[2]);
    }
  }
  
  if (arrowPosition == minutesArrow){
    for (int  i = 0; i < LED_COUNT - 6; i ++){
      leds.setPixelColor(i, minutesColor[0], minutesColor[1], minutesColor[2]);
    }
  }
  
  if (arrowPosition == hoursArrow){
    for (int i = 0; i < LED_COUNT - 10; i ++){
      leds.setPixelColor(i, hoursColor[0], hoursColor[1], hoursColor[2]);
    }
  }

  if (arrowPosition % 5 == 0){
    leds.setPixelColor(18, color[0], color[1], color[2]);
    leds.setPixelColor(17, color[0], color[1], color[2]);
  }
  leds.show();
}

void RPMUpdate(){
  hallSensorRead = digitalRead(HallEffectSensorPin);

  if(hallSensorRead != hallSensorPastState){
    if(hallSensorRead == HIGH){
      timeForOneRotation = millis() - RPMTimer;
      RPMTimer = millis();
      hallSensorPastState = HIGH;
    }
    else{
      hallSensorPastState = LOW;
    }
  }
}

void ClearLedsWithoutTheLastOne(){
   for(int i = 0; i < LED_COUNT - 1; i ++){leds.setPixelColor(i, 0);}
}

int StateFrom60(){
   return (int)floor(((millis() - RPMTimer) * 60) / timeForOneRotation) % 60;
}

In this 3D scheme, you can see how the motor driver is connected to the Raspberry Pi and to the motor. Follow the steps in the instructions one by one and you will have successfully connected the motor to the Raspberry PI

A 3D scheme on how to connect the front steering motor to the Raspberry PI. This includes the Motor Driver and the batteries. The rear motor is also on this scene. 

3D scheme on how to connect the L298N Motor Driver to the Batteries. Follow the step-by-step instructions. Be careful about the PCB terminal connectors.

3D scheme with instructions on how to connect the L298N driver to the batteries and to the motor. Just that. Connecting to the Raspberry Pi is at a later stage of the course. 

The is the whole step-by-step process of connecting the motors with the Raspberry PI with the driver and the batteries. No scheme needed. Everything is already here. In the course, the motors are part of the car and the batteries are in the batteries holder, but with this scheme, you could see the whole process.

3D Instructions on how to add a diode to the Raspberry Pi and indicate when the Raspberry Pi is turned on. 

Step by step guide on how to add the SD card to the Raspberry pi. 

The Raspberry Pi must not be powered.  

These are 3D building instructions on how to connect a diode directly to the batteries and turn it on. 

This is the chassis for the popular FTC Push Bot. The robot is built with the Tetrix set and uses two motors. When preparing for a FIRST Technical Challenge competition (FTC) it is very useful to have a chassis from which you could start working. It might not, and will surely not be the final robot, but a good base is always useful. 

With this chassis, we've also made a short course of how to control it. Take a look at FIRST Technical Challenge. Basic GamePads, control and attachments for the Tetrix set.

It's a VEX IQ robot base with all VEX IQ Sensors. The robot has 1 x Gyro, 1 x Ultrasonic, 1x Color Sensor, 2 x Toch Sensors, 1 x Touch Led Sensor.