A1). Coding in python

I first focus on the individual assignment and then this section. So in the individual assignments I use MQTT protocol which I think is very useful and ubidots to make a Dashboard to capture the max30102 sensor measurements in real time. Now, for this part i'm using python to make a screen and show a graph of the measurements of the max30102 sensor.

For this code I use chatgpt. But I have to made some changes and I had to specify detail information to generate a good result. I'm going to explain part of the code and show the changes I made:

• In the first image you can see the modules I need, which by the way I had to install.
• If you see the second rectangle, I had to change the port and define port were I connect my xiao; for me COM 7.

In the second part of the code:

• It configures the graphic that will show the graph in real time.
• Some labels and size of the screen.
• And updates the data that is receiving from the max30102 sensor.
• It closes the connection to the serial port once the graphic interface closes.

In the next part i'm sharing two videos of the results I got from the coding in python. Just to explain a little bit, the measurement I took was the heart beats and:

• While taking the heart beat measurements I try to increase my heart rate just to see the results.
• In the first video you can see a few measurements taken with the sensor.
• Just as in the first video, the second video shows several measurements but if you see carefully I got 999, this is because I had not placed my finger on the sensor. When I placed it the sensor started taking the right measurements.

A1). Preparing the interface

In this part of the assignments I decide to use MQTT. The idea is that I have is to capture the information from my Max30102 sensor, which by the way i'm using for my final project, so "two birds". The information is the heart beats and the SPO2 in the oxygen. By doing this I can monitor the data from the web if I have the link. So lets give it a try.

• First I have to create a user in Ubidots stem
• Once we create the user and validate our e-mail, we proceed with our task.
• We click on the + sign to add a new device.
• And select a blank device, we are starting from scratch.

• We define the name of the device, in my case ESP32.
• And click on the ok button on the down-left side of the window.
• Inmediately you can see the device we just created.

• We click on the device we just created and it will take you to a screen where you can define some variables.
• I need to define 2 variables, one for the heart beats and the other one for the SPO2.
• This way i'm sure I get my two measurements separately.
• And I can measure with different widgets too.

In this images you can see the two variables I just created. And I make a test, just make a little program that reads two variables. One of them is adding +1 to 0 and the other one substracts -1 to 100 every second. Below i'm going to explain how to make the connection between my code and ubdots project we created.

Now that we have created the variables. We proceed to create a Dashboard, this way we can a have a nicer way to look the measures of the Max30102.

• We clic the ubidots image on the left side of the page. This will take us to a screen which will help us create the dashboard.
• We click on the create button at the right-down corner.
• We select the device, ESP32
• And create the widgets that will help us see the measures.

So, while we create the dashboard by selecting the widgets we have lots of options. This doesn't that we are going to use we each ever we want. It got to be appropriate widgets. For example, in my case I chose:

• In the metrics section:
• Gauge for my SPO2 variable.
• Metric for my heart beat variable.
• Before I forget, you can change the appereance of the widget. Cange color for example, add labels, change background color.

A2). Connection between the Dashboard and the sensor using MQTT.

In this part i'll try to explain what I did to connect my device using MQTT protocol. I'm going to show the code I'm using and explain it:

Lets begin:

• First I use I went to the documentation that ubidots provides.
• After getting to know a little bit of the information a download the library esp32-mqtt-main. This will help me with the connection.
• I install the library in Arduino and verify it.
• The other library is for the max30102 sensor.
• In the image I add it two red rectangles. The first one shows the library I just download to use MQTT.
• And ths second red rectangle shows multiple things:
• Now, in the green rectangle you can see a UBIDOTS_TOKEN. You get this token from ubitos, let me show you:
• In ubitos you go to the device option.
• This will open the device we created at the beggining, esp32.
• At the left side of the next screen it shows a panel, look for the token option.
• Clic the eye button to see the token. (optional)
• Copy the token and past it between the " " like it shows on the green rectangle in the image below.








• WIFI_SSID: the name of the network I connect my device.
• WIFI_PASS: the password of the network.
• DEVICE_LABEL: the name of the device we created at the beggining.
• ubi_spo2: a first variable that reads the SPO2 from the sensor.
• ubi_bpm: a second variable for the heart beat measurements.
• Important: This is a modified code, I add the variables and parts of another code so I could have the measurementsos the max30102 sensor.

• In this next part of the code I define the variables so that the sensor can show me the measurements.
• This variables will help me see the measures taken by the sensor.

• And in this part of the code the sensor reads the measures.
• in the red rectangle I got to make sure to write the variables the way I declare the in the code I just explain.
• The variables that ends with the word valid are just to see if the information is getting to the sensor.
• I didn't consider them in my dashboard.

In this next section I'm sharing with you some 3 videos I took of the final result. En each video you can see the measurements of the max30102 sensor in real time . With this now I can monitor the results of the measurements just by having the the link yo my dashboard.

• In the first video it shows the results in arduino IDE and in ubidots.
• In the second video it shows the results in Arduino IDE, ubidots and my cell phone.
• And finally the third video shows the result in my phone.