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How to make a call using the arduino GSM(sim900/sim900A) intefraing with Arduino uno - KT789

How to make a call using the arduino GSM(sim900/sim900A) intefraing with Arduino uno - KT789


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Arduino IDE 1.8.5 (programmable platform for Arduino)

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GSM/GPRS 900 Module

The SIM900A delivers GSM/GPRS 900/1800MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption. With Board size of 75x54mm, and interfacing ports of Serial UART DB9 Female, TTL, Mic, Speaker, I2C, ADC, PWM (Floating Points). With Power Button (press and hold for 3 seconds to power on the module), Reset button and within built regulated power supply, can operate from 9v to 12v AC/DC. Has an option for SMA Antenna.

-Dual-Band 900/ 1800 MHz
• GPRS multi-slot class 10/8
• GPRS mobile station class B
• Compliant to GSM phase 2/2+
– Class 4 (2 W @900 MHz)
– Class 1 (1 W @ 1800MHz)
• SAIC (Single Antenna Interference Cancellation) support
• Control via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands)
• SIM application toolkit
• internal Supply voltage range : 3.2 ... 4.8V
• External Supply voltage range : 9 ... 12V DC
• Low power consumption: 1.0mA(sleep mode&BS-PA- MFRMS=9 )
• Operation temperature: -40°C to +85 °C

• Serial and TTL (3.3v)
• Simcard holder
• Analog audio interface
• SPI interface
• TTL interface
• Antenna SMA Connector
• I2C
• Reset Button
• Power Button
• LED for Power
• LED for Network
• LED for Ring

• AT cellular command interface


  • Arduino pin 13 to LED positive and ground to LED negative
  • Arduino D7 to push button one point and ground to another point



We are going to build a project where, when the button is pressed, Arduino calls a predefined telephone number. When we have pressed the button the LED lights up. Now, Arduino is calling cell phone. If I press the button once more Arduino hangs up the call. That’s it. .

The parts needed in order to build this project are these: we need an Arduino Uno, the TinySine GSM shield, a SIM card in order to use a GSM network, a LED and a button

We have to wait for around 30 sec, in order for the SIM to connect to the GSM network. If we press the button now, the LED will turn on and it will call cell phone. If i press it again, it will turn off and hang up the call.