Send SMS Using SIM900 GSM Shield & Arduino - Visuino Tutorial

Ron.Cutts May 27.2025

0 11 Easy

In this tutorial you will learn how to send sms using the SIM900 GSM Shield and Visuino.

With one button we will set the GSM shield into text messages Mode, set the number and the text message, with the second button we are going to send sms.

You will also learn how to use the "Serial Software" component in Visuino.

Watch the Video!

Also check out this tutorial: Make a Phone Call Using the SIM900 GSM Shield & Arduino - Visuino Tutorial

STEP 1

What You Will Need

SIM900 GSM ShieldArduino UNOSim card (You should disable the pin request on the sim card before using it with the GSM shield)Breadboard2X button2X 1Kohm resistorJumper wires5V power supply with enough amps for the shieldVisuino program: Download Visuino

STEP 2

The Circuit

Connect the SIM900 GSM Shield to the Arduino

Connect Arduino pin [5V] to breadboard positive pin [Red line]Connect Arduino pin [GND] to breadboard negative pin [Black line]

Connect Arduino Digital pin [2] to button1 on the breadboard and to the Resistor1Connect other side of the resistor1 to the breadboard pin [GND]Connect Other pin of the button1 to the breadboard positive pin [5V]

Connect with the Jumpers on the shield pins D8(RX) & D7(TX) like you see it on the pictureMake sure that the antenna is connected to the shieldConnect the 5V Power Supply to the shield, and set the switch on the shield to the External Power (See the picture)Once the Power is connected hold the Power button for 2sOnce the connection with the Network is established the LED will blink every 3s

STEP 3

Start Visuino, and Select the Arduino UNO Board Type

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 4

In Visuino Add Components

Add "Software Serial Port" componentAdd "Add "Text Value" componentAdd 2X "Debounce Button" componentAdd 3X "Delay" componentAdd "Char Value" componentAdd "Text Multi-Source Merger" component

STEP 5

In Visuino Set Components

Double click on the "TextValue1" and in the Elements window Command to set GSM shield to text mode: drag "Set Value" to the left side and in the properties window set "Value" to AT+CMGF=1Command to set Phone number (International Format): drag another "Set Value" to the left side and in the properties window set "Value" to AT+CMGS="+495XXXXXX" Command to set Text Message: In the Elements window Drag another "Set Value" to the left side and in the properties window set "Value" to Hello from VisuinoClose the Elements window

Select "Delay2" and in the properties window set "Interval (uS)" to 2000000Select "CharValue1" and in the properties window set "Value" to #26

STEP 6

In Visuino Connect Components

Connect Arduino digital pin [2] to "Button1" pin [In]Connect Arduino digital pin [3] to "Button2" pin [In]Connect "Button1" pin [Out] to "TextValue1" > "Set Value1" pin [In]Connect "Button1" pin [Out] to "Delay1" pin [Start]Connect "Button1" pin [Out] to "Delay2" pin [Start]Connect "Delay1" pin [Out] to "TextValue1" > "Set Value2" pin [In]Connect "Delay2" pin [Out] to "TextValue1" > "Set Value3" pin [In]Connect "Button2" pin [Out] to "Delay3" pin [Start]Connect "Delay3" pin [Out] to "CharValue1" pin [Clock]Connect "TextValue1" pin [Out] to "TextMultiMerger1" pin [0]Connect "CharValue1" pin [Out] to "TextMultiMerger1" pin [1]Connect "TextMultiMerger1" pin [Out] to "SoftwareSerial1" pin [In]Connect "SoftwareSerial1" pin [RX] to Arduino Digital pin [7]Connect "SoftwareSerial1" pin [TX] to Arduino Digital pin [8]

Optional if you want to monitor response from the GSM shield: Connect "SoftwareSerial1" pin [Out] to Arduino Serial pin [In]

STEP 7

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 8

Play

When you power the Shield wait a bit for the connection with the network to be established, once the connection is established the LED on the shield will blink every 3s.

Now you can press a button and the GSM shield will go into Text Messages Mode and it will set the phone number and set the Text message. To send SMS just press the other button.

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

SIM900-GSM-SMS.zip 1KB Download(0)

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Ron.Cutts Dec 09.2023

784 M-point

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