In this Version 2 tutorial we will learn how to get the Bitcoin price from the internet using the TTGO ESP32 and Visuino, we will also learn how to add a SSL certificate to the ESP32 board.

In this tutorial we are going to use Bitstamp API access, In the first original tutorial we were using a Coindesk API.
Link to the first tutorial here

Watch the Video!

Step 1: What You Will Need

TTGO ESP32
WiFi connection
Visuino program: Download Visuino

Step 2: Start Visuino, and Select the Arduino TTGO T-Display ESP32 Board Type

The Visuino: https://www.visuino.eu also needs to be installed. Download Free version or register for a Free Trial.

Start Visuino as shown in the first picture Click on the "Tools" button on the Arduino component (Picture 1) in Visuino When the dialog appears, select "TTGO T-Display ESP32" as shown on Picture 2

Step 3: Get Server SSL Certificate for Your ESP

Go to https://projects.petrucci.ch/esp32/?page=ssl and paste the https://www.bitstamp.net in the Edit box and click "Get Certificate" button (Picture1)
Click on the "DigiCert SHA2 Extended Validation Server CA" Image (Picture2)
(Picture 3) In the Table below "cert:" select the certificate field and copy it to the Clipboard (you will need it in the next step)

Step 4: In Visuino Set WiFi

Select TTGO T-Display ESP32 board and in the properties window expand "Modules>WiFi>Connect To Access Points
Click on the Connect To Access Points 3 Dots
In the AccessPoints window drag "WiFi Access Point" to the left side
In the properties window set SSID (name of your WiFi hotspot or router)
In the properties window set Password (password of your WiFi hotspot or router)
Close AccessPoints window
Select TTGO T-Display ESP32 board and in the properties window expand "Modules>WiFi>Sockets
Click on the Sockets 3 Dots
In the "Sockets window" drag TCP/IP Secure Client (SSL) to the left
In the properties window set Host to: www.bitstamp.net
select "CACert" and click on the 3 dots button and in the "CACert window" paste the Certificate that you got in the previous step
Close the "Sockets window"

Step 5: In Visuino Set Display

Select TTGO T-Display ESP32 board and in the properties window expand "Modules>Display>Orientation"
Set Orientation to:goRight

Select TTGO T-Display ESP32 board and in the properties window expand "Modules>Display>Elements" Click on the Elements 3 Dots

In the Elements window Drag "Draw Text" to the left and in the properties window set size to 2 and text to ASK.
In the Elements window Drag "Text Field" to the left and in the properties window set size to 3, color to "aclGold" and Y to 20.

In the Elements window Drag another "Draw Text" to the left and in the properties window set size to 2 ,text to BID and Y to 48.
In the Elements window Drag another "Text Field" to the left and in the properties window set size to 3, color to "aclGold" and Y to 66.
In the Elements window Drag another "Draw Text" to the left and in the properties window set size to 2 ,text to LAST and Y to 92.
In the Elements window Drag another "Text Field" to the left and in the properties window set size to 3, color to "aclGold" and Y to 110.

Optionally you can add bitmap to the Display, to do that in the Elements window drag "Draw Bitmap" to the left side and in the properties window set X to 160, Y to 30
Click on the Bitmap 3 Dots
In the Bitmap Editor Load the Bitcoin bitmap (picture 1) and close the Bitmap editor
You can find other bitmaps at https://iconarchive.com/search?q=bitcoin

Step 6: In Visuino Add Components

Add "HTTP Client" component
Select "HTTPClient1" and in the properties window set Host to www.bitstamp.net
Click on the Requests 3 Dots
In the "Requests window" drag "GET" to the left side
In the properties window set URL to: /api/v2/ticker/btcusd/
Close the requests window
Add "Char To Text" component
Select "CharToText1" and in the properties window se Max Length to 2000
Add "Clock Generator" component
Select "ClockGenerator1" and in the properties window set frequency to 0.2, this will be the refresh time, you can adjust it if you want.
Add "Delay" components and in the properties window set "Interval (uS)" to 2000000
Add "Split JSON Object" component

Step 7: In Visuino Parsing JSON

With the mouse right click on the "SplitJSON1" and in the menu click on the "Parse JSON Object.."

In the "JSON Object" window paste this sample code(avalible on https://www.bitstamp.net/api/v2/ticker/btcusd/ )

Or copy paste the following:

{"high": "61517.51", "last": "59946.59", "timestamp": "1635092369", "bid": "59913.89", "vwap": "60635.81", "volume": "1111.78956785", "low": "59510.00", "ask": "59930.59", "open": "61306.64"}

Close the "JSON Object" window
"SplitJSON1" component will now create new pins

Step 8: In Visuino Connecting Components

Connect "ClockGenerator1" pin Out to "HTTPClient1" pin Clock
Connect "TTGO T-Display ESP32" pin [Connected] to "Delay1" pin Start
Connect "TTGO T-Display ESP32" pin [Remote Connected] to "HTTPClient1" pin Clock
Connect "HTTPClient1" pin Content to "CharToText1" pin In
Connect "HTTPClient1" pin to TTGO T-Display ESP32 > WiFi>TCP Secure Client1 pin In
Connect "Delay1" pin Out to "CharToText1" pin Clock and TTGO T-Display ESP32 > WiFi>TCP Secure Client1 pin Disconnect
Connect "CharToText1" pin Out to "SplitJSON1" pin In
Connect "SplitJSON1" pin [Ask] to TTGO T-Display ESP32 >Display Text Field1 pin[In]

Connect "SplitJSON1" pin [Bid] to TTGO T-Display ESP32 >Display Text Field2 pin[In]
Connect "SplitJSON1" pin [Last] to TTGO T-Display ESP32 >Display Text Field3 pin[In]
Note: you can also play with the other pins from "SplitJSON1" component

Step 9: Generate, Compile, and Upload the Code

In Visuino, at the bottom click on the "Build" Tab, make sure the correct port is selected, then click on the "Compile/Build and Upload" button.

Step 10: Play

If you power the TTGO ESP32 module it will connect to the network and display the current Bitcoin price data.

Congratulations! You have completed your project with Visuino. Also attached is the Visuino project, that I created for this Tutorial, you can download it and open it in Visuino: https://www.visuino.eu

Note: In the File Project when you open it in Visuino, change the WiFi settings (Access point and password) to your settings.

You can learn more about the Bitstamp API here https://www.bitstamp.net/api/