Get Servo Motor Positions From SD Card

In this tutorial we are going to read servo motor positions from the SD card where we saved a text file with positions.

Watch the Video!

Step 1: What You Will Need

• Arduino UNO (Or any other Arduino)
• SD card module
• SD card to store a file
• Servo motor
• Jumper wires
• Breadboard
• Visuino program: Download Visuino

Step 2: Brought by PCBWay

Thank you PCBWay for supporting this tutorial and helping users learn more about electronics.

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Step 3: The Circuit

 

Step 4: Prepare the SD Card

In a Notepad type angle positions from 0 to 180 and save it to the SD Card in file “SERVO.TXT”

Step 5: Start Visuino, and Select the Arduino UNO Board Type

The Visuino: https://www.visuino.com 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 “Arduino UNO” as shown on Picture 2

Step 6: In Visuino Add Components

• Add “Pulse Generator” component
• Add “Counter” component
• Add “Micro SD Card Module” component
• Add “Text To Analog” component
• Add “Divide Analog By Value” component
• Add “Servo” component

Step 7: In Visuino Set Components

   

• If you want to set Servo motor positions faster or slower then adjust the Frequency of the “PulseGenerator1”
• Select “DivideByValue1” and in the properties window set “Value” to 180

• Double click on the “SDCard1” and in the “Elements” window drag “File” to the left side and in the properties window set “Path Name” to SERVO.TXT
• Select “Elements” and click on the 3 dots button and in the new “Elements” window:
• Drag “Read Seek” to the left side and in the properties window select “Position” and click on the pin icon and select “Cardinal SinkPin”
• Drag “Read Text Line” to the left
• Close both “Elements” windows

Step 8: In Visuino Connect Components

 

• Connect “PulseGenerator1” pin [Out] to “SDCard1” > “Read Text Line1” pin [Clock]
• Connect “PulseGenerator1” pin [Out] to “Counter1” pin [In]
• Connect “Counter1” pin [Out] to “SDCard1” > “Read Seek1” pin [Position]
• Connect “SDCard1” > “Read Text Line1” pin [Out] to “TextToAnalog1” pin [In]
• Connect “TextToAnalog1” pin [Out] to “DivideByValue1” pin [In]
• Connect “DivideByValue1” pin [Out] to “Servo1” pin [In]
• Connect “Servo1” pin [Chip Select] to “Arduino” Digital pin [2]
• Connect “SDCard1” pin [SPI] to “Arduino” pin [SPI]
• Connect “SDCard1” pin [Chip Select] to “Arduino” Digital pin [10]

Step 9: Generate, Compile, and Upload the Arduino 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