Quickstart SIM8. 00 SIM8. L with Arduino. SIM8. GSM module among hobbyists and Arduino community. Even though AT command reference is available with a quick Google search, it is not very easy for a beginner to properly understand and use Arduino with SIM8. Therefore, this post summarizes how a beginner could interact with SIM8. Serial Tx Rx Gndec' title='Serial Tx Rx Gndec' />SIM800 is one of the most commonly used GSM module among hobbyists and Arduino community. Even though AT command reference is available with a quick Google. Serial Quick Reference Guide For more information about NI products, refer to ni. Refer to the NI Trademarks and Logo Guidelines at ni. SerialtoEthernet Device Servers Device Server Specifications Serial Interface Number of Ports 4 Serial Standards RS232422485. Arduino and in few future posts well be going ahead with several other real life use cases discussing how SIM8. Arduino effectively. Wiring. Caution SIM8. V 4. 2. V. Therefore, if you directly connect the Vcc pin to Arduino 5. V pin, it might damage the module as well. I tried 3. 3. V Arduino pin with no luck. Therefore if you have the SIM8. LM3. 17 and few calculations with a LM3. Fortunately I am using below module with voltage regulators built in For above module Arduino to SIM8. SIM8. 00 5v4v Arduino 5v. SIM8. 00 GND either one Arduino GNDSIM8. SIMTXD Arduino D8 read through for the reasonSIM8. Serial Tx Rx Gndi' title='Serial Tx Rx Gndi' />SIMRXD Arduino D7 read through for the reasonConnect module with Arduino as mentioned above or with any changes depending on the module being used. Insert a valid SIM card and connect the Arduino with Arduino IDE. Simple Serial Communication. Below is the simplest program usable to interact with SIM8. Serial Tx Rx Gnd' title='Serial Tx Rx Gnd' />Software. Serial. SIM8. 00 TX is connected to Arduino D8. SIM8. 00TXPIN 8. SIM8. RX is connected to Arduino D7. SIM8. 00RXPIN 7. Create software serial object to communicate with SIM8. Serial Tx Rx GndtvSerial Tx Rx Gnd AirportSoftware. Serial serial. SIM8. SIM8. 00TXPIN,SIM8. RXPIN. Begin serial comunication with Arduino and Arduino IDE Serial Monitor. Serial. begin9. 60. Serial. Being serial communication witj Arduino and SIM8. SIM8. 00. begin9. Serial. printlnSetup Complete. Spectre Gunship Game Android. Read SIM8. 00 output if available and print it in Arduino IDE Serial Monitor. SIM8. 00. available. Serial. writeserial. SIM8. 00. read. Read Arduino IDE Serial Monitor inputs if available and send them to SIM8. Serial. available. SIM8. 00. writeSerial. Upload above code to the Arduino Code itself is self explanatory. Hence, will not repeat same. Once upload is complete start the Arduino Serial Monitor from Tools menu. Set Baud rate to 9. Both NL and CR. Once done, you can freely send AT commands to SIM8. Few examples AT is to check if interface is working fine. ATCFUN is used to set phone functionality. ATCFUN returns currently set value for ATCFUNATCFUNATCFUN similar to helpATCFUN1 is to sent ATCFUN to 1 full functionalityATCREG ATCOPS returns currently registered operator details. ATCOPS returns all the operators available. Sending SMS with Software. Serial. In below code delay of 1 second is used after each command to give necessary time for SIM8. With this approach it is not possible to clearly identify any ERROR conditions because program will not ready the responses sent. Proper method of doing this is by checking each response against an expected value. This is already handled in most of the Arduino libraries including Seeeduino library well be using below. Hence, for this stage, 1 second delay is used for the sake of simplicity. Note Replace 0. XXXXX with mobile number SMS should be sent to. Software. Serial. SIM8. 00 TX is connected to Arduino D8. SIM8. 00TXPIN 8. SIM8. RX is connected to Arduino D7. SIM8. 00RXPIN 7. Create software serial object to communicate with SIM8. Software. Serial serial. SIM8. 00SIM8. 00TXPIN,SIM8. RXPIN. Begin serial comunication with Arduino and Arduino IDE Serial Monitor. Serial. begin9. 60. Serial. Being serial communication witj Arduino and SIM8. SIM8. 00. begin9. Serial. printlnSetup Complete. Serial. printlnSending SMS Set SMS format to ASCII. SIM8. 00. writeATCMGF1rn. Send new SMS command and message number. SIM8. 00. writeATCMGS0. XXXXXrn. Send SMS content. SIM8. 00. writeTEST. Send CtrlZ ESC to denote SMS message is complete. SIM8. 00. writechar2. Serial. printlnSMS Sent. SIM8. 00 Libraries. With a quick Google search you will be able to find several SIM8. Arduino libraries. After going through source codes of several libraries my selection was SeeeduinoGPRS library which provides basic SIM8. GPRS related features. Sending SMS with Seeeduino Arduino library. Note Seeeduino library assumes that TX connected to D8 and RX is connected to D7 on Arduino. This is the reason we used relevant pins at first place. If you need to connect SIM8. Arduino pin, you will have to modify the library source gprs. Library uses MIT license. Once library is installed in Arduino IDE File menu, Examples section you will find SeeeduinoGPRS library and withing examples you will find GPRSSend. SMS example which reads as follows. Sketch GPRS Connect TCP. Function This sketch is used to test seeeduino GPRSs send SMS func. SIM card to Seeeduino GPRS and replace the phone. Number,enjoy it. Software. Serial. Serial. begin9. Serial. Serial. printlnGPRS Send SMS Test Init. Serial. printinit errorrn. Serial. printlnInit success, start to send SMS message SMS0. XXXXX,hello,world define phone number and text. If you go through Seeeduino library you will notice that it is possible to send commands directly for any advanced use cases. For examples there are library methods such as send. Cmd. And. Wait. For. Respconst charcmd, const char xpected. Resp, unsigned timeoutsend. Cmdconst charcmdwait. For. Respconst char esp, unsigned int timeoutHence, you could simply correctly rewrite the SMS sending application as below reinvent the wheel. Cmd. And. Wait. For. RespATCMGF1rn, OK, DEFAULTTIMEOUT Set message mode to ASCII. ERRORERROR CMGF. Cmd. And. Wait. For. RespATCMGS0. XXXXXrn, gt ,DEFAULTTIMEOUT. ERRORERROR CMGS. SIM8. SIM8. 00. writechar2. I hope we have covered enough details for a quick start. It will be helpful if you could further go tough Seeeduino library to understand how they have used different commands. Read more about SIM8.