DHT 11 using Arduino millis function

[Jasmine_Yahaya]

I'am making an app to read temperature and humidity sensor by using millis function instead of delay. The bluetooth connection work just fine but i can't get the sensor data. How can i create the block to display the sensor data based on my code? I'm new to mit app inventor:)

This is my block for bluetooth but i dont know how to create block for displaying sensor data

[Juan_Antonio]

@Jasmine_Yahaya

here examples:

Bluetooth HC-06. Arduino. Send. Receive. Send text file. Multitouch. Image

Hello friends, In this topic I am going to show some examples of Arduino UNO with the Bluetooth HC-06 module. I will start with simple examples and later I will put some more complicated codes.

[Jasmine_Yahaya]

Thankyou for the examples:) I have tried building my own blocks but it does not work.I've changed my code too
My goal is that the reading of sensor appear when i open the app. When i tried to use the app with arduino this messages pops up

I'm on dead end because i need to complete this app in order to understand how to get reading from sensor so that i can work with my other sensors for my final year project
Home_Automation_System.aia (8.9 KB) This is my project file if it might help. Any suggestions and guidance is highly appreciated because i desperately need it😅

[Juan_Antonio]

Try this
/**
Serial.print("Temperature...
...
...
*/

String send_this = String(t, 2) + "," + String(h,2);
Serial.println(send_this);

In app you receive a list with two elements.

Bluetooth HC-06. Arduino. Send. Receive. Send text file. Multitouch. Image

21.- Arduino sends three random numbers to App. p9A0i_bluetooth_aleatorios.aia (3.9 KB) [bt_55] // Juan A. Villalpando // http://kio4.com/appinventor/9A0_Resumen_Bluetooth.htm int x; int y; int z; String datos; void setup() { Serial.begin(9600); } void loop() { x = random(0, 10); y = random(10, 100); z = random(100,1000); datos = (String) x + "," + (String) y + "," + (String) z; Serial.println("Números aleatorios:"); Serial.println("Random numbers:"); Serial.println(datos); delay(800); …

[ABG]

You can run your Clock faster once you correct your blocks.

[Jasmine_Yahaya]

I've tried with the code as you suggest
Home_Automation_System (1).aia (8.9 KB)
This is the block

I still cannot get the reading displayed

[Jasmine_Yahaya]

For this one, i dont change the code but i changed the interface and the block
temperature_and_hum.aia (3.7 KB)
Still cant get the reading

[Juan_Antonio]

@Jasmine_Yahaya

Have you consulted my example?

Bluetooth HC-06. Arduino. Send. Receive. Send text file. Multitouch. Image

21.- Arduino sends three random numbers to App. p9A0i_bluetooth_aleatorios.aia (3.9 KB) [bt_55] // Juan A. Villalpando // http://kio4.com/appinventor/9A0_Resumen_Bluetooth.htm int x; int y; int z; String datos; void setup() { Serial.begin(9600); } void loop() { x = random(0, 10); y = random(10, 100); z = random(100,1000); datos = (String) x + "," + (String) y + "," + (String) z; Serial.println("Números aleatorios:"); Serial.println("Random numbers:"); Serial.println(datos); delay(800); …

• I use 3 variables (1, 2, 3), adapt it to two variables (1, 2).

To test set:
Arduino
const unsigned long interval = 3000;

App:
Clock1.TimerInterval = 2700

Change measurement_list by data in your code.

[ABG]

You failed to update element list from incoming data.

You split a piece of irrelevant text ('-') at a character value (LF) unrelated to your actual split marker (',')

Your Clock was slow and non-repeating.

[Jasmine_Yahaya]

Sorry it is not about the project but i want to ask is it possible that my hc-05 broken? I have tried to receive data and send data by using bluetooth terminal but nothing displayed. I also tried many times using SoftwareSerial but it only works once and when i tried to receive/send data again nothing displayed.

[Juan_Antonio]

@Jasmine_Yahaya

my hc-05 broken?

No. Your device is set to 38400 baud and you have to set it to 9600 using AT commands. Tomorrow I will write a guide on that.

Edit: here a guide:

HC-05 Bluetooth. Arduino. Change baud rate 38400. Send random to app

Hello friends, To carry out applications with Bluetooth between Arduino and App Inventor, the HC-06 module is usually used. This module can only work as a client, enough for most of the projects that you will see in the tutorials, it is the most used and recommended. Default 9600. [bluetooth1] Another similar module is the HC-05, this can function as a server or a client. You may have to set the speed using AT commands to adapt it to App Inventor. It comes with 38400 baud and you will have t…

[Jasmine_Yahaya]

Thanks for the guide and guidance! I also just found out that the rx tx pin needs to be cross connected to my Arduino board
Here's the result