I'm making something with an arduino uno and a LCD 16 x 2 screen that will show a random message chosen from an array on the top line every time you press a button and if you don't press the button for 20 seconds it will give a randomized "goodbye" message then show no text, and I will show the temperature and humidity on the button line with a DHT11 temperature sensor. When I wired it in tinkercad it worked exactly as intended (but without the DHT11 because tinkercad doesn't have that) but when I actually wired it, the temperature worked as intended but it's just cycling through the random messages really quickly even when I don't do anything and I don't think it's showing the goodbye message, I don't think it's a software issue but here's my code anyway
#include <LiquidCrystal.h>
#include <dht.h>
// putting lots of comments
LiquidCrystal lcd(12, 11, 2, 3, 4, 5); // connect the screen to those pins
const char* messages[] =
{
"Hello ",
"How are you? ",
// there are more messages but you don't have to see those
};
const char* goodbyeMessages[] =
{
"Goodbye ",
"see you later ",
"Farewell ",
"powering off "
};
const int buttonPin = 6; // connect button to pin 6
bool buttonPressed = false;
unsigned long lastMessageTime = 0; // time passed since the button was pressed
const unsigned long constTimeToLeave = 20000; // will turn timeToLeave variable into the proper amount of time after becoming 999999
unsigned long timeToLeave = 20000; // how long it will take since pressing the button to say goodbye, will turn into 999999 so that it doesnt constantly give goodbye messages
unsigned long timeToPowerOff = 1000; // how long it will take to turn off after saying goodbye
// (for temperature)
dht DHT; // make a dht (temp/humid sensor's brand) variable called DHT
#define DHT11_PIN 7 // designate the temp/humid sensor to pin 7
void setup()
{
lcd.begin(16, 2); //setup the screen
randomSeed(analogRead(A0)); // number generator
pinMode(buttonPin, INPUT_PULLUP);
}
void loop()
{
// check if the button is pressed
if (digitalRead(buttonPin) == LOW)
{
timeToLeave = constTimeToLeave; // sets timeToLeave to be the right amount of time
buttonPressed = true;
lastMessageTime = millis(); // update last message time
delay(75);
}
//show the random message when i press the button
if (buttonPressed)
{
int randomIndex = random(0, sizeof(messages)/ sizeof(messages[0])); // randomly picks a message
lcd.setCursor(0, 0); // moves the cursor of the screen to be the start of the sentence
lcd.print(messages[randomIndex]); // writes the randomly selected message
buttonPressed = false;
}
if (millis() - lastMessageTime >= timeToLeave)
{
int randomGoodbyeIndex = random(0, sizeof(goodbyeMessages) / sizeof(goodbyeMessages[0])); // chooses random goodbye message
lcd.setCursor(0, 0);
lcd.print(goodbyeMessages[randomGoodbyeIndex]); // shows the goodbye message
timeToLeave = 999999;
delay(timeToPowerOff);
lcd.setCursor(0, 0);
lcd.print (" ");
buttonPressed = false;
}
// read temperature
int chk = DHT.read11(DHT11_PIN);
//show temperature on screen
lcd.setCursor(0, 1);
lcd.print("T:");
lcd.print(DHT.temperature);
lcd.print("C,");
lcd.print ("H:");
lcd.print(DHT.humidity);
}
and here are pictures of my wiring in tinkercad and in real life
both of the resistors are 1.8kho
Thanks.
