A ledstrip on a Harp, now I can see the strings at night!
Woohoo .. ( Little harp in the background (autoharp))
Well .. its a pity that the distance of the leds is NOT the same as the strings distance.
I could light up the string to be played, or even cooler …
When using FFT code (Fast Fourier Transform), I could light up the string being played!
I’m probably going to try to implement this at a later time.
Info:
How is the maze generated?
It is generated using recursive backtracking:
Start at 0,0 mark visited, select a random direction from unvisited neighbours, push current on the stack, goto new location, and mark this visited.
Repeat until no possible directions.
pop from the stack a previous location, another direction possible? Take that path and repeat.
Repeat popping from stack, until stack empty .. now all cells are visited
longest pop : 41
maze
------------------------
| || || || |
--- ---
| || || || || |
------------ ---
| || || || |
--- --- ---
| || || || |
--- ---
| || || || || || || |
| || || || || || || || |
---
| || || || || || |
--------- ---
| || |
------------------------
x y : 00
maze 4
|4|3|6|3|6|5|3|2|
|2|12|9|12|9|6|9|10|
|14|5|3|2|6|9|6|9|
|14|3|12|11|10|6|13|3|
|10|10|2|10|10|10|6|11|
|8|10|10|10|10|10|10|10|
|6|9|12|9|10|8|10|10|
|12|5|5|5|13|5|9|8|
Easiest play mode: Preview Maze, Show visited path, NO reset to square 0,0 and NOT the longest path so :
| Show visited DIP1 | Reset to 0,0 DIP2 | Preview DIP3 | Longest path DIP4 |
| 1 | 0 | 1 | 0 |
Hard mode:
| Show visited DIP1 | Reset to 0,0 DIP2 | Preview DIP3 | Longest path DIP4 |
| 0 | 1 | 0 | 1 |
Todo: Battery / batterymanager / 3D case / better buttons
Some video shorts put together to show modes
CODE
#include <Arduino.h>
#include <Adafruit_NeoPixel.h>
#include "StackArray.h"
// Pin Assign
int up=25;
int down=33;
int left=32;
int right=26;
int trailsw=17;
int restartsw=5;
int showmazesw=18;
int popendsw=19;
int xend=7;
int yend=7;
int countpop=0;
int currentpop=0;
int directions[4]{};
int notalldone = 1;
int tmpx=0;
int tmpy=0;
int xgen = 1;
int ygen = 1;
int x = 0;
int y = 0;
int showmaze = 0;
// 0 easy = trail // 1 only red walls // 2 = reset to 0.0
int mode=0;
//int trail=32;
int trail=32;
// Which pin on the Arduino is connected to the NeoPixels?
#define LED_PIN 2
// How many NeoPixels are attached to the Arduino?
#define LED_COUNT 64
// Declare our NeoPixel strip object:
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
int maze[8][8] = {
};
int displaymatrix[8][8] = {
{ 0,1,2,3,4,5,6,7 },
{ 15,14,13,12,11,10,9,8 },
{16,17,18,19,20,21,22,23},
{31,30,29,28,27,26,25,24},
{32,33,34,35,36,37,38,39},
{47,46,45,44,43,42,41,40},
{48,49,50,51,52,53,54,55},
{63,62,61,60,59,58,57,56}
};
int visitmatrix[10][10] = {
1,1,1,1,1,1,1,1,1,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,1,1,1,1,1,1,1,1,1
};
void(* resetFunc) (void) = 0;
void drawmaze2(){
Serial.print("x y : ");
Serial.print(x);
Serial.println(y);
Serial.print("maze ");
Serial.println(maze[x][y]);
for(int ledy=0;ledy<8;ledy++)
{ Serial.print("|");
for(int ledx=0;ledx<8;ledx++){
Serial.print(maze[ledx][ledy]);
Serial.print("|");
if ( maze[ledx][ledy] != 0 ) {
// mled.dot(ledx,ledy); // draw dot
// mled.display();
// delay(50);
}
}
Serial.println("");
}
Serial.println("");
delay(100);
}
void drawmaze(){
Serial.println("maze ");
for(int ledy=0;ledy<8;ledy++)
{
// 1st line
for(int ledx=0;ledx<8;ledx++){
if(bitRead(maze[ledx][ledy], 3) == 0){ Serial.print("---"); } else { Serial.print(" "); }
}
Serial.println("");
// 2nd line
for(int ledx=0;ledx<8;ledx++){
if(bitRead(maze[ledx][ledy], 0) == 1){
if(bitRead(maze[ledx][ledy], 2) == 1){
Serial.print(" "); }
else
{ Serial.print(" |"); }
}
if(bitRead(maze[ledx][ledy], 0) == 0){
if(bitRead(maze[ledx][ledy], 2) == 1){
Serial.print("| "); }
else
{ Serial.print("| |"); }
}
}
Serial.println("");
}
// last line
int ledy=7;
for(int ledx=0;ledx<8;ledx++){
if(bitRead(maze[ledx][ledy], 1) == 0){ Serial.print("---"); } else { Serial.print(" "); }
}
Serial.println("");
//Serial.println("");
delay(100);
}
void mazegen(){
visitmatrix[xgen][ygen]=1;
StackArray <int> rowStack;
StackArray <int> colStack;
rowStack.push(xgen);
colStack.push(ygen);
while(notalldone == 1){
visitmatrix[xgen][ygen]=1;
while(!rowStack.isEmpty()) {
int count=0;
//up
if ( visitmatrix[xgen-1][ygen] == 0 ){
directions[count]=1;
count++;
}
//right
if ( visitmatrix[xgen][ygen+1] == 0 ){
directions[count]=2;
count++;
}
//down
if ( visitmatrix[xgen+1][ygen] == 0 ){
directions[count]=4;
count++;
}
//left
if ( visitmatrix[xgen][ygen-1] == 0 ){
directions[count]=8;
count++;
}
if (showmaze == 1 ){
strip.setPixelColor(displaymatrix[xgen-1][ygen-1], 32, 32, 32);
strip.show();
delay(50);
}
// no dir found
if (count == 0 ) {
if (digitalRead(popendsw) == 0 ){
currentpop = rowStack.count();
if (currentpop > countpop ) {
countpop = currentpop;
xend = xgen-1;
yend = ygen-1;
Serial.print("longest pop : ");
Serial.println(currentpop);
}
}
// mled.dot(x-1,y-1);
// mled.display();
xgen = rowStack.pop();
ygen = colStack.pop();
// Serial.println("popping ");
} else {
// count random direction
int dir = directions[random(count)];
//Serial.println("push ");
rowStack.push(xgen);
colStack.push(ygen);
// Serial.print("nr dir : ");
// Serial.println(count);
//delay(100);
// Serial.println(dir);
// move 1,1 to 0,0
//mled.dot(x-1,y-1);
//mled.display();
// set direction in maze, dit moet bit set worden
int mybits = maze[xgen-1][ygen-1];
int storedir = mybits | dir;
maze[xgen-1][ygen-1] = storedir;
if ( dir == 1){
int getup = maze[xgen-2][ygen-1];
int storedir = getup | 4;
maze[xgen-2][ygen-1] = storedir;
}
if ( dir == 2){
int getup = maze[xgen-1][ygen];
int storedir = getup | 8;
maze[xgen-1][ygen] = storedir;
}
if ( dir == 4){
int getup = maze[xgen][ygen-1];
int storedir = getup | 1;
maze[xgen][ygen-1] = storedir;
}
if ( dir == 8){
int getup = maze[xgen-1][ygen-2];
int storedir = getup | 2;
maze[xgen-1][ygen-2] = storedir;
}
// maze[x-1][y-1] = dir;
//set new square
if (dir == 1){ xgen--; }
if (dir == 2){ ygen++; }
if (dir == 4){ xgen++; }
if (dir == 8){ ygen--; }
visitmatrix[xgen][ygen]=1;
//drawmaze();
}
}
notalldone = 0; //#2
// if found 0 in 10x10 matrix visited, do
for(int checkx=0;checkx<10;checkx++){
for(int checky=0;checky<10;checky++){
if ( visitmatrix[checkx][checky] == 0 ){
tmpx=xgen;
tmpy=ygen;
notalldone = 1;
}
}
}
}
rowStack.push(tmpx);
colStack.push(tmpy);
}
void setup() {
pinMode(32, INPUT_PULLUP);
pinMode(33, INPUT_PULLUP);
pinMode(25, INPUT_PULLUP);
pinMode(26, INPUT_PULLUP);
pinMode(popendsw, INPUT_PULLUP);
pinMode(trailsw, INPUT_PULLUP);
pinMode(restartsw, INPUT_PULLUP);
pinMode(showmazesw, INPUT_PULLUP);
Serial.begin(115200);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
strip.setBrightness(10);
unsigned long seed = 0;
for (int i=0; i<32; i++)
{
seed = seed | ((analogRead(A0) & 0x01) << i);
}
randomSeed(seed);
if (digitalRead(showmazesw) == 0){
showmaze = 1;
}
mazegen();
drawmaze();
drawmaze2();
strip.fill(0, 0, 64);
strip.show(); // Initialize all pixels to 'off'
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.setPixelColor(displaymatrix[xend][yend], 0, 255, 0);
strip.show();
x=0;
y=0;
}
uint32_t Wheel(byte WheelPos) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
}
if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
WheelPos -= 170;
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}
void reset2start() {
strip.setPixelColor(displaymatrix[x][y], 0, 0, 0);
strip.show();
x = 0;
y = 0;
strip.begin();
strip.show(); // Initialize all pixels to 'off'
strip.setBrightness(10);
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.setPixelColor(displaymatrix[xend][yend], 0, 255, 0);
strip.show();
}
void rainbow(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256; j++) {
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel((i+j) & 255));
}
strip.show();
delay(wait);
}
}
void loop() {
if (digitalRead(trailsw) == 0 ){
trail = 32;
} else { trail = 0; }
if (digitalRead(restartsw) == 0 ){
mode = 2;
} else {
mode = 0;
}
int isUp = (bitRead(maze[x][y], 1));
int isRight = (bitRead(maze[x][y], 2));
int isDown = (bitRead(maze[x][y], 3));
int isLeft = (bitRead(maze[x][y], 0));
//isUp = 1;
//isDown = 1;
//isLeft = 1;
//isRight = 1;
if (digitalRead(up) == 0) {
if (isUp == 1){
strip.setPixelColor(displaymatrix[x][y], 0, 0, trail);
y++;
drawmaze();
if ( y > 7) { y=7;}
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
} else {
strip.setPixelColor(displaymatrix[x][y], 255, 0, 0);
strip.show();
delay(100);
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
if (mode == 2){
delay(1000);
reset2start();
}
}
}
if (digitalRead(down) == 0) {
if (isDown == 1){
strip.setPixelColor(displaymatrix[x][y], 0, 0, trail);
y--;
drawmaze();
if ( y < 0) { y=0;}
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
} else {
strip.setPixelColor(displaymatrix[x][y], 255, 0, 0);
strip.show();
delay(100);
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
if (mode == 2){
delay(1000);
reset2start();
}
}
}
if (digitalRead(left) == 0) {
drawmaze();
if (isLeft == 1){
strip.setPixelColor(displaymatrix[x][y], 0, 0, trail);
x--;
drawmaze();
if ( x < 0) { x=0;}
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
} else {
strip.setPixelColor(displaymatrix[x][y], 255, 0, 0);
strip.show();
delay(100);
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
if (mode == 2){
delay(1000);
reset2start();
}
}
}
if (digitalRead(right) == 0) {
drawmaze();
if (isRight == 1){
strip.setPixelColor(displaymatrix[x][y], 0, 0, trail);
x++;
drawmaze();
if ( x > 7) { x=7;}
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
} else {
strip.setPixelColor(displaymatrix[x][y], 255, 0, 0);
strip.show();
delay(100);
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
if (mode == 2){
delay(1000);
reset2start();
}
}
}
if (x ==xend && y == yend){
strip.begin();
strip.show(); // Initialize all pixels to 'off'
rainbow(20);
}
delay(200);
}
As POC for the maze game.
Maze generation!
Make an initial cell the current cell
mark it as visited
While there are unvisited cells
If the current cell has any neighbours
which have not been visited
Choose randomly one of the unvisited neighbours
Push the current cell to the stack
Mark wall hole
Make the chosen cell the current cell
mark it as visited
Else if stack is not empty
Pop a cell from the stack
Make it the current cell
This is my implementation of backtracking
The displaymatrix function is a implementation of different led mappings
Still have to decide where to place endpoint …
At 8,8 or at first stack pop?
Maybe both?
Code
#include <WEMOS_Matrix_LED.h>
#include <StackArray.h>
int directions[4]{};
int notalldone = 1;
int tmpx=0;
int tmpy=0;
int x = 1;
int y = 1;
MLED mled(5); //set intensity=5
int maze[8][8] = {
};
int displaymatrix[8][8] = {
{ 0,1,2,3,4,5,6,7 },
{ 8,9,10,11,12,13,14,15 },
{16,17,18,19,20,21,22,23},
{24,25,26,27,28,29,30,31},
{32,33,34,35,36,37,38,39},
{40,41,42,43,44,45,46,47},
{48,49,50,51,52,53,54,55},
{56,57,58,59,60,61,62,63}
};
int visitmatrix[10][10] = {
1,1,1,1,1,1,1,1,1,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,0,0,0,0,0,0,0,0,1,
1,1,1,1,1,1,1,1,1,1
};
void setup() {
Serial.begin(115200);
randomSeed(analogRead(0));
mazegen();
drawmaze();
}
void mazegen(){
visitmatrix[x][y]=1;
StackArray <int> rowStack;
StackArray <int> colStack;
rowStack.push(x);
colStack.push(y);
while(notalldone == 1){
visitmatrix[x][y]=1;
while(!rowStack.isEmpty()) {
int count=0;
//up
if ( visitmatrix[x-1][y] == 0 ){
directions[count]=1;
count++;
}
//right
if ( visitmatrix[x][y+1] == 0 ){
directions[count]=2;
count++;
}
//down
if ( visitmatrix[x+1][y] == 0 ){
directions[count]=4;
count++;
}
//left
if ( visitmatrix[x][y-1] == 0 ){
directions[count]=8;
count++;
}
// no dir found
if (count == 0 ) {
mled.dot(x-1,y-1);
mled.display();
x = rowStack.pop();
y = colStack.pop();
Serial.println("popping ");
} else {
// count random direction
int dir = directions[random(count)];
Serial.println("push ");
rowStack.push(x);
colStack.push(y);
Serial.print("nr dir : ");
Serial.println(count);
//delay(100);
Serial.println(dir);
// move 1,1 to 0,0
mled.dot(x-1,y-1);
mled.display();
// set direction in maze, dit moet bit set worden
int mybits = maze[x-1][y-1];
int storedir = mybits | dir;
maze[x-1][y-1] = storedir;
if ( dir == 1){
int getup = maze[x-2][y-1];
int storedir = getup | 4;
maze[x-2][y-1] = storedir;
}
if ( dir == 2){
int getup = maze[x-1][y];
int storedir = getup | 8;
maze[x-1][y] = storedir;
}
if ( dir == 4){
int getup = maze[x][y-1];
int storedir = getup | 1;
maze[x][y-1] = storedir;
}
if ( dir == 8){
int getup = maze[x-1][y-2];
int storedir = getup | 2;
maze[x-1][y-2] = storedir;
}
// maze[x-1][y-1] = dir;
//set new square
if (dir == 1){ x--; }
if (dir == 2){ y++; }
if (dir == 4){ x++; }
if (dir == 8){ y--; }
visitmatrix[x][y]=1;
drawmaze();
}
}
notalldone = 0; //#2
// if found 0 in 10x10 matrix visited, do
for(int checkx=0;checkx<10;checkx++){
for(int checky=0;checky<10;checky++){
if ( visitmatrix[checkx][checky] == 0 ){
tmpx=x;
tmpy=y;
notalldone = 1;
}
}
}
}
rowStack.push(tmpx);
colStack.push(tmpy);
}
void drawmaze(){
Serial.println("Generating done - Drawing");
for(int ledx=0;ledx<8;ledx++)
{
for(int ledy=0;ledy<8;ledy++){
Serial.print(maze[ledx][ledy]);
if ( maze[ledx][ledy] != 0 ) {
mled.dot(ledx,ledy); // draw dot
mled.display();
// delay(50);
}
}
Serial.println("");
}
Serial.println("");
delay(100);
}
void loop() {
}
While doing stuff like, making our home a little greener. Smoking meat. Working on diorama’s and my Escape game. I found time to make this little maze game.
Using an ESP32, mini joystick and a 8×8 led matrix. The objective is to get to the other side of the invisible maze.
It is a blind maze, so you have to figure out the path by trail and error. I found it quite fun and entertaining. (Coline had a hard time finishing the mode 3 maze)
I’ve got 3 settings on the maze:
0 – There is a trail where you have been.
1 – No trail, but only red leds showing walls.
2 – No trail, red reds and a reset to square 0,0 .. so you have to remember the path you previously took.
I’ll add code and schematics tomorrow …
Light blue shows you where you have been
Mode 2 game, reset when hitting a wall
Hitting the end block!
Maze is static at the moment, i’m planning to implement a “Recursive division method” to generate the maze.
Code
#include <Arduino.h>
#include <Adafruit_NeoPixel.h>
// joystick pins
int up=33;
int down=25;
int left=32;
int right=26;
int cursor=32;
// 0 easy = trail // 1 only red walls // 2 = reset to 0.0
int mode=2;
//int trail=32;
int trail=0;
// Which pin on the Arduino is connected to the NeoPixels?
#define LED_PIN 2
// How many NeoPixels are attached to the Arduino?
#define LED_COUNT 64
// Declare our NeoPixel strip object:
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
// bits set opening in square
// 2
// -----
// 1 | | 4
// -----
// 0
// so 5 is a passage from left to right (1+4)
int maze[8][8] = {
4,5,3,6,5,5,5,3,
6,5,11,12,5,3,6,9,
14,1,12,5,3,10,12,1,
12,5,5,3,10,12,5,3,
2,6,5,9,14,5,1,10,
10,10,6,5,9,6,5,9,
12,11,10,6,1,10,6,1,
4,9,12,13,5,13,13,1,
};
int displaymatrix[8][8] = {
{ 0,1,2,3,4,5,6,7 },
{ 15,14,13,12,11,10,9,8 },
{16,17,18,19,20,21,22,23},
{31,30,29,28,27,26,25,24},
{32,33,34,35,36,37,38,39},
{47,46,45,44,43,42,41,40},
{48,49,50,51,52,53,54,55},
{63,62,61,60,59,58,57,56}
};
int x = 0;
int y = 0;
void setup() {
// joy
pinMode(32, INPUT_PULLUP);
pinMode(33, INPUT_PULLUP);
pinMode(25, INPUT_PULLUP);
pinMode(26, INPUT_PULLUP);
// mode set with jumpers
pinMode(34, INPUT_PULLUP);
pinMode(35, INPUT_PULLUP);
Serial.begin(115200);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
strip.setBrightness(10);
// set begin and end pixel
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.setPixelColor(displaymatrix[7][7], 0, 255, 0);
strip.show();
//mode select
if (digitalRead(34) == 0) {
mode=0;
if (digitalRead(35) == 0) {
mode=2;
} else {
mode=1;
}
// finish effect
uint32_t Wheel(byte WheelPos) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
}
if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
WheelPos -= 170;
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}
// reset to start (mode 2)
void reset2start() {
strip.setPixelColor(displaymatrix[x][y], 0, 0, 0);
strip.show();
x = 0;
y = 0;
strip.begin();
strip.show(); // Initialize all pixels to 'off'
strip.setBrightness(10);
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.setPixelColor(displaymatrix[7][7], 0, 255, 0);
strip.show();
}
// finish effect
void rainbow(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256; j++) {
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel((i+j) & 255));
}
strip.show();
delay(wait);
}
}
void loop() {
int isUp = (bitRead(maze[x][y], 1));
int isRight = (bitRead(maze[x][y], 2));
int isDown = (bitRead(maze[x][y], 3));
int isLeft = (bitRead(maze[x][y], 0));
if (digitalRead(up) == 0) {
if (isUp == 1){
strip.setPixelColor(displaymatrix[x][y], 0, 0, trail);
x++;
if ( x > 7) { x=7;}
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
} else {
strip.setPixelColor(displaymatrix[x][y], 255, 0, 0);
strip.show();
if (mode == 2){
delay(1000);
reset2start();
}
}
}
if (digitalRead(down) == 0) {
if (isDown == 1){
strip.setPixelColor(displaymatrix[x][y], 0, 0, trail);
x--;
if ( x < 0) { x=0;}
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
} else {
strip.setPixelColor(displaymatrix[x][y], 255, 0, 0);
strip.show();
if (mode == 2){
delay(1000);
reset2start();
}
}
}
if (digitalRead(left) == 0) {
if (isLeft == 1){
strip.setPixelColor(displaymatrix[x][y], 0, 0, trail);
y--;
if ( y < 0) { y=0;}
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
} else {
strip.setPixelColor(displaymatrix[x][y], 255, 0, 0);
strip.show();
if (mode == 2){
delay(1000);
reset2start();
}
}
}
if (digitalRead(right) == 0) {
if (isRight == 1){
strip.setPixelColor(displaymatrix[x][y], 0, 0, trail);
y++;
if ( y > 7) { y=7;}
strip.setPixelColor(displaymatrix[x][y], 0, 0, 255);
strip.show();
} else {
strip.setPixelColor(displaymatrix[x][y], 255, 0, 0);
strip.show();
if (mode == 2){
delay(1000);
reset2start();
}
}
}
if (x ==7 && y == 7){
strip.begin();
strip.show(); // Initialize all pixels to 'off'
rainbow(20);
}
delay(200);
}
I asked ChatGPT to write code for me, i was not completely correct, and in Python. https://www.henriaanstoot.nl/2023/03/28/i-asked-chatgpt-to-write-code-for-a-crack-the-code-game/
I wrote my on version in JavaScript so it can be used in NodeRed as a function.
The codes are entered using a keypad (Arduino) and send via MQTT
Node Red Dash board
Code
var code = global.get("mysetcode");
var good = 0;
var wrong = 0;
var wrongplace = 0;
var match = false;
var wrongchars = 0;
var wrongplaced = 0;
var goodchars = 0;
var payloadcode = msg.payload.toString();
var usr_input = Array.from(payloadcode);
var secret_code = Array.from(code);
var secret_code1 = secret_code;
if (msg.payload === code) {
match = true;
}
var result = "";
for (var i = 0; i < 4; i++) {
var found = false;
if (usr_input[i] === secret_code[i]) {
usr_input[i] = "a";
secret_code[i] = "b";
good = good + 1;
}
}
for (var i = 0; i < 4; i++) {
var found = false;
for (var j = 0; j < 4; j++) {
if (usr_input[i] === secret_code[j]) {
found = true;
}
}
if (!found) {
wrong = wrong + 1;
}
}
wrongchars = wrong - good;
wrongplaced = 4 - good - wrongchars;
msg.goodchars = good;
msg.wrongchars = wrongchars;
msg.wrongplace = wrongplaced;
msg.result = result;
msg.match = match;
return msg;
When you need a large digital joystick, but only got an analog one. You can use below code to make the joystick act as a digital one.
I’ve played with analog joysticks on digital pins also, it can be done. But it can be buggy, and needs extra code.
Note: The joystick pins are marked with 5V, but when you use a Arduino which can only read till 3.3V using its ADC (Analog Digital Convertors), you can get some weird readings.
When moving down and left is reads okay, but up and right react as being connected together!
Just try it with 3.3V or use a resistor.
Above shows a ESP32, but below code has Arduino Nano pin names, change accordingly.
CODE
The code gives you a direction only once, you will need to move the stick to the middle position first and then move again.
Below gave me readings between 0 and 1024 (10 bits)
Hence the between 350 and 650 for the middle position.
Most will give you a reading between 0 and 4096.
Want to set the resolution yourself?
analogReadResolution(10); // 10 bits
int val1 =0;
int val2 =0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
int sensorValue1 = analogRead(A0);
int sensorValue2 = analogRead(A1);
if (sensorValue1 > 650){
if (val1 == 0){
Serial.print("DOWN");
Serial.println(" ");
val1=1;
}
}
else if (sensorValue1 < 350){
if (val1 == 0){
Serial.print("UP");
Serial.println(" ");
val1=1;
}
}
else if (sensorValue2 > 350 && sensorValue2 < 650){
val1=0;
}
if (sensorValue2 > 650){
if (val2 == 0){
Serial.print("LEFT");
Serial.println(" ");
val2=1;
}
}
else if (sensorValue2 < 350){
if (val2 == 0){
Serial.print("RIGHT");
Serial.println(" ");
val2=1;
}
}
else if (sensorValue2 > 350 && sensorValue2 < 650){
val2=0;
}
delay(100);
}
I’ve posted a switches puzzle here.
https://www.henriaanstoot.nl/2023/03/25/last-weeks-useful-schematics/
I was thinking of a easier setup which is “static”.
Mine has a 65535 possibility setup, but you can make an easy puzzle with below setup.
Set D3 to
pinMode(D3, INPUT_PULLUP);
Notice that I’ve placed the wires for some switches at the bottom, so these switches need to be set in the other direction “off” than the others.
Only 7 switches matter, you could use all of them.
When using a switch with only two connections, place the switch upside-down. Now OFF is switch with ON.
| ON | ? | ? | ? |
| ? | OFF | ON | OFF |
| ? | ? | OFF | ? |
| ? | OFF | ? | ? |
is the correct setting
These are last weeks findings, I will add to this page when I discover other useful things.
Platformio
Arduino IDE
Generic
I’ve build a IR Blaster in the past and tested IR with EspEasy Dev.
I’m not happy with my Harmony Hub. Not so much control as i like to have.
So now OpenMqttGateway with IR.
I’ve installed platformio in the past.
Not really a fan of visual-code i’m showing you the process on CLI
We can’t use the webinstaller or a precompiled binary because we need to change GPIO ports
wget https://github.com/1technophile/OpenMQTTGateway/releases/download/v1.5.0/nodemcuv2-ir-libraries.zip wget https://github.com/1technophile/OpenMQTTGateway/archive/refs/tags/v1.5.0.tar.gz tar xzvf v1.5.0.tar.gz cd v1.5.0/libs unzip ../../nodemcuv2-ir-libraries.zip cd .. edit platformio.ini remove ; from default_envs = nodemcuv2-ir vi main/config_IR.h search for LOLIN, edit and change into 0 (GPIO 0 = D3) build and upload pio run --target upload --upload-port /dev/ttyUSB0 build and upload with flash erase pio run --target erase --target upload --upload-port /dev/ttyUSB0 clean the environment when needed pio run -t clean
Now you will get a Access Point, connect and enter your Wifi network information and mqtt server.
When connected you will see the IR codes and if you installed mqtt support in home assistant it will see the mqtt topics.
I’ve copied a json output as was send by my IR remote.
Below an example using mosquitto_pub to send codes.
mosquitto_pub -t home/OpenMQTTGateway_ESP8266_IR/commands/MQTTtoIR -h mymqttserver -m '{
"value": 1270235327,
"protocol": 3,
"bits": 32,
"hex": "0x4BB640BF",
"protocol_name": "NEC",
"raw": "8908,4498,536,604,510,1700,532,604,512,604,510,1722,510,604,510,1700,534,1700,534,1702,532,606,510,1722,510,1700,534,604,512,1722,510,1722,510,604,512,604,510,1702,532,606,510,606,510,604,510,604,512,604,512,604,510,1722,510,606,510,1722,510,1702,532,1700,534,1722,512,1722,510,1700,534"
}'
platformio commands
Why use platformio?
I know Arduino IDE is easier for starters.
Platformio is far more flexible, you can make projects with their own versions of libraries.
I like CLI, easier to do version control (git)
pip install -U platformio pio upgrade pio update
Some screenshots of my visual code platformio
While working on my game, i had to come up with some solutions i could not find an answer for on the internet.
I’m not going to post every little detail of my game on this blog, my main reason is sharing my experiences and solutions.
16 SWITCHES
16 Switches on a Wemos Arduino. While push buttons are easier to connect, I needed ON/OFF switches.
Push buttons are easy, there is only one active, so 4 enable lines and 4 scan lines and you’re golden.
16 Switches can be enabled all at the same time.
So you need some extra components to get a good result (0-65535)
Above schematic works, you need 4x 1k Pull-up resistors and 16 diodes. I used 1N4007
CONTROLLING 24V using Arduino and a buck convertor
Next problem, i’m using some elevator buttons for a project. These have build-in leds but run at 24V.
I only have 5V from the Arduino.
Regular leds you can connect directly to the Arduino using a 220ohm resistor.
So i used a Buck-Step-Up-Convertor. This little module converts 5V to 24V. (You can control the output voltage using a variable resistor)
To control the lamp/leds i used a PN2222a transistor to switch the lights on/off using a pin of the Arduino.
