Mazze generator

Projects Programming
1

I am trying to make a Mazze generator using / and \ but I can't use them so I have to use ASCII values 47 and 92. I don't know how to use a random for two specific numbers. this is what I have so far it only prints /.

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>
long randNumber;
int slash[2] = {47, 92};

Adafruit_SH1107 display = Adafruit_SH1107(64, 128, &Wire);


void setup() {
  // put your setup code here, to run once:

  Serial.begin(115200);

  Serial.println("128x64 OLED FeatherWing test");
  delay(250); // wait for the OLED to power up
  display.begin(0x3C, true); // Address 0x3C default

  display.display();
  delay(1000);

  display.clearDisplay();
  display.display();
  display.setRotation(1);
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(0,0);

}

void loop() {
  // put your main code here, to run repeatedly:
  randNumber = random(0, 1);
  display.write(slash[randNumber]);
  delay(10);
  display.display();
}
2

From the random reference page:

Syntax
random(max)
random(min, max)

Parameters
min: lower bound of the random value, inclusive (optional).
max: upper bound of the random value, exclusive.

Returns
A random number between min and max-1. Data type: long.

You're asking for a random number between 0 and 1-1.

Also:

char slash[2] = {'/', '\\'};
3 
randNumber = random(0, 1);

What range of random numbers will this return ?

Reading https://docs.arduino.cc/language-reference/en/functions/random-numbers/random/ might help answer the question

4

You can use them like this

char slash[] = { '/', '\\' };

void setup()
{
    Serial.begin(115200);
    Serial.println(slash[0]);
    Serial.println(slash[1]);
}

void loop()
{
}
5

I was hopeing 1 and 0 in random order.

6

If you didn't look at the link to the reference page for random that I provided, did you read the excerpt from it that I included?

You may have been hoping for a random number in [0, 1], but your code is asking for a random number in [0, 1).

The solution should be obvious.

7

I am trying to generate a random order of back and forward slashes onto an OLED screen. I don't know how to create a random order.

8

Start by generating a random number that is either 0 or 1

randNumber = random(0, 1);

Does not do it

9

You've been told what you've done wrong. Three times now, in fact. If you won't read, if you won't think, there's nothing more anyone can do to change that.

10

Ok, I sat down for a second look. It was as simple as changing it to 2. It also gave me some more info on how to make it more random.

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>
#define i2c_Address 0x3c
Adafruit_SH1107 display = Adafruit_SH1107(64, 128, &Wire);
long randNumber;
char slash[2] = {'/', '\\'};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  Serial.println("128x64 OLED FeatherWing test");
  delay(250); // wait for the OLED to power up
  display.begin(0x3C, true); // Address 0x3C default
  display.setRotation(1);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(0,0);
  display.display();
  randomSeed(analogRead(A0));
}

void loop() {
  // put your main code here, to run repeatedly:
  randNumber = random(2);
  display.write(slash[randNumber]);
  delay(10);
  display.display();
}
11

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