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Day and Night Application With Using LDR on Mblock

 In this application, we will practice day and night with LDR. It will also be a night light application. We learned how to measure the value of LDR in the previous lesson. Now, after reading these values, we will both automatically flash the led and make a short application in the Mblock program.


Let's come to the circuit elements:

1-Arduino Uno (1)

2-BreadBoard

3-220Ω Resistor(2 pcs)

4-Led (1 )

5-LDR (1)

6-Jump Cables

We need supplies.

Our circuit diagram is as follows.

Day and Night Application With Using LDR on Mblock


We connect a 220 ohm resistor to one leg of our LDR. We connect a cable to one leg of the resistor we connected and connect this cable to the 5 volt pin (blue cable) We connect the other leg of the resistor we connected to one leg of the LDR to the analog pin A0 with a cable (yellow cable) (Here is one leg of the LDR, one leg of the resistor and the cable is the same at the bottom. We connect it to the other free leg of the LDR with a GND (- terminal) cable. Let's connect a 220 ohm resistor to the long leg of the led we added. Let's connect one leg of this resistor to our digital pins with a cable. Let's connect the GND (- Terminal ) with the cable from the other leg of the LED and finish our circuit.

Thus, we have prepared our circuit. It's time to write our code.

City with water (The dark one) city with water 2 (The bright one) in the Mblock library as a new backdrop

Mblock examples


I added one sprite to the scene.

Adding one sprite to the scene


 

The code part is as follows:

LDR code on Mblock


When the green flag is clicked, we must first read the value on the A0 analog pin. To transfer this value to a variable, I first create a variable for the Light value from the Data&Block menu. To transfer the light value to this Light value variable, I place the A0 analog pin read command from the Robots menu into the Light value variable. If the light value is lower than a certain amount, let it be Day, otherwise Night. For this, I get the command if not from the control menu. Let's do the if part first. I get the small transaction code from the action menu I insert it into your code. I'm placing the light value data on one side of this smaller code. In the other part, I write a light value. I found that if it is very bright in my environment, I found that the light value drops below 700, so I determined a number like 750. If the light value is lower than 750, let the decor change and the bright one come. Add this toggle code from look menu to .....decor. I choose the decor that is bright. And I connected my led and I do not light the digital pin low (I added this code from the robots menu). If. If this value is greater than 750, the backdrop scene decor will change and a darker decor will come. And by making the led on the digital pin high, we will make it light up. Then the night will come. In fact, this application we have made can also be referred to as a night light application with LDR. The only difference is that we didn't just turn on and off the led. We made a small decor change using mblock.

In order to run these codes, after connecting our arduino board and circuit to the computer with a usb cable, we first select the Serial port from the Connect menu, then select the port to which our arduino board is connected. After selecting it, we will have sent the codes we wrote with the firmware update to our arduino board from the connect menu again. Thus, our program becomes ready to run.

encode mode on mblock


Note: If you keep the light on the LDR, the light value will decrease, if you cover the LDR, the light value will increase.


To download the source code of the program CLICKHERE

To download the source code of the program CLICK HERE  (This program ise done with mblock 5 version)

Note: You can upload the codes to the arduino uno board by pressing the connect and upload buttons at the bottom of the screen respectively.

First of all, we add the upload mode broadcast extension for each part from the extensions section. Thus, we can enable interaction between the arduino uno card and the sprites or the background.


We add 2 day and night of the backgrounds to the scene and sprite.


We create a variable called light value. When our arduino uno board starts to work, let the value of this variable be 0. Then the value read from LDR is assigned to this variable. If the value of our variable is lower than 750, our led will turn on and the message will have a value of 1, which will send a message to interact with the sprite and the background. If the value of the variable is not less than 750 our led will turn off and the message will have a value of 0 which will send a message to interact with the sprite and the background.



If the value of the message from the arduino uno card part is 1, sprite will say "Night Time", otherwise, it will say "Day Time".




If the value of the message from the arduino uno card part is 1, make the background of the scene the night background, otherwise, make it the day background.



 
Similar Topics

For All Scratch Examples CLICK HERE

For Mblock With Arduino Examples CLICK HERE




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