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renamed all markdown files to index.md, also added a link to Eddy's urn
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content/posts/2015/tektree-part-4-programming/index.md
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---
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title: "TekTree part 4 - programming"
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date: "2015-12-24:23:00"
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template: "post"
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category: "IOT"
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tags:
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- "tektree"
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- "christmas"
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description: "I finally get to the juicy code of my home-made christmas tree shambles!"
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disqusId: "18"
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---
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In the last installment of the series I show you how to program the arduino to work with the TekTree we built. I would advise each and every one of you to download my sketch and try it but after that start experimenting with your own designs!
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## Testing
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Before we start writing complicated code we first need to design a very simple test sketch for the leds. The script I used can be found below or at [Github](https://github.com/Mastermindzh/TekTree) under the following directory: Testing -> LedTest
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The code is quite simple. It sets all led's as output and runs through them. back and forth
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```ino
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/*
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Rick van Lieshout
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24-12-2015
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LICENSE: MIT
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*/
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const int DELAYTIME = 100;
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const int NUMBEROFPINS = 11;
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const int pinArray[NUMBEROFPINS] = {0,1,2,3,4,5,6,7,8,9,10};
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void setup() {
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//initiate pins
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for (int thisPin = 0; thisPin < NUMBEROFPINS; thisPin++) {
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pinMode(pinArray[thisPin], OUTPUT);
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}
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}
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void loop() {
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// loop from the lowest pin to the highest:
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for (int thisPin = 0; thisPin < NUMBEROFPINS; thisPin++) {
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// turn the led on:
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digitalWrite(pinArray[thisPin], HIGH);
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// wait for a bit
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delay(DELAYTIME);
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// turn the led off:
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digitalWrite(pinArray[thisPin], LOW);
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}
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// loop from the highest pin to the lowest:
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for (int thisPin = NUMBEROFPINS - 1; thisPin >= 0; thisPin--) {
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// turn the led on:
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digitalWrite(pinArray[thisPin], HIGH);
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// wait for a bit
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delay(DELAYTIME);
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// turn the led off:
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digitalWrite(pinArray[thisPin], LOW);
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}
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}
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```
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Assuming all went well you should now see the led's come on 1 by 1 and create a little wave effect (first pattern down!)
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Now that we know it all works let's clean up the code and add some pattern handling.
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## The finished code / result
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The complete code can once again be found on github or directly below the video.
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That's it for now. **Merry christmas and a happy new year folks!**
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<iframe width="560" height="235" src="https://www.youtube.com/embed/VlQoVNe77Ys" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
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## The code that makes it work
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```ino
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/*
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Rick van Lieshout
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24-12-2015
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LICENSE: MIT
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*/
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/** Constant value's, these have to be changed manually **/
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const int MAXSEQUENCES= 20; // number of steps in the largest sequence. Could make it 999 but that would affect performance
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const int NUMBEROFPINS = 11; // number of leds
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const int NUMBEROFPATTERNS = 5; // number of patterns specified
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const int DELAYPOT = 0; // number of pin that pot is connected to
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const int BUTTONPIN = 12; // number of pin that button is connected to
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const int pinArray[NUMBEROFPINS] = {0,1,2,3,4,5,6,7,8,9,10}; // pins where leds are connected
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/** Regular variables, program can alter these **/
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int previousbuttonstate = 0; // used to detect whether button is pressed
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int buttonstate = 0; // used to detect whether button is pressed
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int pattern = 0; // pattern to start with
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/** massive array which holds the patterns **/
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const byte LEDsequence [NUMBEROFPATTERNS][MAXSEQUENCES][NUMBEROFPINS] = {
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{
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{0,0,0,0,0,0,0,0,0,0,0},
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},
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{
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{1,1,1,1,1,1,1,1,1,1,1},
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},
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{
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{1,0,0,0,0,0,0,0,0,0,1},
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{0,1,0,0,0,0,0,0,0,0,1},
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{0,0,1,0,0,0,0,0,0,0,1},
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{0,0,0,1,0,0,0,0,0,0,1},
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{0,0,0,0,1,0,0,0,0,0,1},
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{0,0,0,0,0,1,0,0,0,0,1},
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{0,0,0,0,0,0,1,0,0,0,1},
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{0,0,0,0,0,0,0,1,0,0,1},
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{0,0,0,0,0,0,0,0,1,0,1},
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{0,0,0,0,0,0,0,0,0,1,1}
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},
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{
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{1,0,0,0,0,0,0,0,0,0,1},
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{0,1,0,0,0,0,0,0,0,0,1},
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{0,0,1,0,0,0,0,0,0,0,1},
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{0,0,0,1,0,0,0,0,0,0,1},
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{0,0,0,0,1,0,0,0,0,0,1},
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{0,0,0,0,0,1,0,0,0,0,1},
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{0,0,0,0,0,0,1,0,0,0,1},
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{0,0,0,0,0,0,0,1,0,0,1},
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{0,0,0,0,0,0,0,0,1,0,1},
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{0,0,0,0,0,0,0,0,0,1,1},
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{0,0,0,0,0,0,0,0,1,0,1},
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{0,0,0,0,0,0,0,1,0,0,1},
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{0,0,0,0,0,0,1,0,0,0,1},
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{0,0,0,0,0,1,0,0,0,0,1},
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{0,0,0,0,1,0,0,0,0,0,1},
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{0,0,0,1,0,0,0,0,0,0,1},
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{0,0,1,0,0,0,0,0,0,0,1},
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{0,1,0,0,0,0,0,0,0,0,1}
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},
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{
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{1,0,0,0,0,0,0,0,0,1,1},
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{0,1,0,0,0,0,0,0,1,0,1},
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{0,0,1,0,0,0,0,1,0,0,1},
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{0,0,0,1,0,0,1,0,0,0,1},
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{0,0,0,0,1,1,0,0,0,0,1},
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{0,0,0,1,0,0,1,0,0,0,1},
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{0,0,1,0,0,0,0,1,0,0,1},
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{0,1,0,0,0,0,0,0,1,0,1},
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{1,0,0,0,0,0,0,0,0,1,1}
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}
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};
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/** Setup only gets run once **/
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void setup(){
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//set all pins as input/output
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initializePins();
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}
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/** Loop is constantly running **/
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void loop() {
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// read button state
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buttonstate = digitalRead(BUTTONPIN);
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// if button state changed
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if(buttonstate != previousbuttonstate){
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previousbuttonstate = buttonstate;
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// check value and add to pattern
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if(buttonstate == HIGH){
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if(pattern +1 == NUMBEROFPATTERNS){
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pattern = 0;
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}else{
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pattern++;
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}
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}
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}
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// Loop through all the arrays and toggle pins on or off.
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for (int sequence=0;sequence<getSequences(pattern);sequence++) {
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for (int pin=0;pin<NUMBEROFPINS;pin++) {
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digitalWrite(pinArray[pin], LEDsequence[pattern][sequence][pin]);
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}
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// delay between sequences, should use millis if you want instant response on the button
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delay(getDelay(DELAYPOT));
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}
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}
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/** Count the number of sequences in a specific pattern **/
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int getSequences(int pattern){
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byte amount = 0;
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for(byte i = 0; i<MAXSEQUENCES; i++){
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int total = 0;
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for(int pin=0; pin<NUMBEROFPINS; pin++){
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total+=LEDsequence[pattern][i][pin];
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}
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if(total>0){
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amount++;
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}
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}
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return amount;
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}
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/** get value of pot **/
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int getDelay(int potnr){
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return analogRead(potnr);
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}
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/** Set all pins as either output or input **/
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void initializePins(){
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pinMode(BUTTONPIN, INPUT);
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for (int pin=0;pin<NUMBEROFPINS;pin++) {
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pinMode(pinArray[pin], OUTPUT); // we make all the declarations at once
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}
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}
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```
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