Maker Screen Thermometer with Alarm

Use the ‘Parts List’ image along with the component cards in your box to correctly plug in the electronic hardware to your Maker Board. The colorful dots next to the legs of the components match up to the ports where that leg should go on Maker Board’s ports.

Code

The code in the editor below is ready to run! Plug in the electronic components just like the Parts List card above, connect Maker Board to your computer's USB port with the cable, and hit 'Upload Your Code!'. Tinker with the code and change something! If you get stuck, you can hit the 'Restore' button to make the code go back to the working example.


/* Display the temperature on the Maker Screen. When the temp goes above your threshold, sound an alarm and print a message */ #include "MakerScreenXVI.h" //A code library enables new functions to be used with the screen MakerScreenXVI lcd; //the library name is followed by the 'name' you give the LCD screen. Here it is 'lcd' void setup() { lcd.begin(); //.begin() 'sets up' the screen. You'll always need it when using Maker Screen lcd.backlightOn(); //turn on the screen backlight pinMode(A5,INPUT); //temp sensor in Maker Screen top row of ports next to + and - ports pinMode(A3,OUTPUT); //speaker } void loop() { lcd.setCursor(0,0); //set the cursor to the upper-left of the screen int tempF = analogRead(A5)*0.46; //create a variable named tempF. This converts the analogRead into a temperature in Farenheit lcd.print("TempF: "); //'print' a text label on the screen lcd.print(tempF); //'print' the value of the tempF variable on the screen delay(500); //wait 500 milliseconds (0.5 seconds) betwen taking temperature readings if(tempF > 80){ //If the temperature reading goes above 80 degrees... lcd.setCursor(0,1); //Move the cursor to the second row of the screen lcd.print("It's Hot!"); //'print' your 'alarm' message tone(A3,500); //Play a tone of 500 hertz on the speaker delay(250); //delay 250 milliseconds (.25 seconds) with the tone playing noTone(A3); //stop the beep on the speaker } else{ //otherwise (if the temperature is not above 80) lcd.setCursor(0,1); //set the cursor to the second row of the screen lcd.print(" "); //'print' a big blank message as an easy way to clear out the old alarm message } } // (c) 2019 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense
 

Walkthrough Video

Watch the video for a line-by-line explanation of how the example program works. Then you'll be ready to make some changes of your own!

Challenges

Can you completes the challenge? Change the code in your code editor above. Upload your code to see the effect when you're finished. Complete a challenge? Check it off the list!

Concepts

These are the new code concepts covered in this example program. To become a great coder, read through these concepts to learn new vocabulary.

Quiz

If you're having trouble, try to run an experimental program or look at the example code to help you find the answer.

1. Which syntax ends the entire 'void loop' function?




2. Which syntax ends a single code command?