• USB Port: Can be used as debugging and firmware upgrading. This is a Simple Homemade Phone using GSM Module and Arduino. This can also be used for your business numbers to answer to your customer’s calls during non-office hours. The Arduino makes sure that the call is active and then plays the recorded voice message on the voice …   String newchar = String (char(Incomingch)); //convert the char to string by using string objects SIM800 features GPRS multi-slot class 12/ class 10 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. }, Subscribe below to receive most popular news, articles and DIY projects from Circuit Digest. Similarly connect the 16x2 LCD to Arduino analog pins A0, A1, A2, A3, A4, A5. Similarly, it can also be used to send an SMS as well as read a received SMS. You need to enter a 10 digit number. 3. You will receive SMS after 15 Seconds. ATH: Halt call We will start with selection of GSM modem, AT commands and connection of GSM Module with Arduino.   while(Fdata != "OK") //Until call successfully answered The complete circuit diagram of this Automatic Voice Call answering Machine project is given above. GSM Sim900A pin configuration: The … The pin 8 which triggers the voice is declared as output pin. “How to Electronics” is an electronics engineering community built and run by passionate electronics engineers. 7. But, we all have faced situations during which we might not be able to answer to our calls, these calls might be an important personal call or a life changing business call and you could have just missed that opportunity since you were not able to answer that call at that particular time. #: used to halt or terminate message / terminate incoming Call, // These pins are connected to GSM module( RX, TX ), // These are connected to LCD pins (RS, EN, D4 ,D5, D6, D7 ) respectively, Vdd-5V, Vss & R/W -GND, //String codes: RC =Receive call, RM= Receive msg, SC= Send calll, SM= Send message, WT= Wait, // Its wait for SMS and Calls in this loop, // Service provide name is printed on LCd, // FINALLY, the module is set to receive, Receive_on will beocome true in case msg or call arrives, // In case of no reciving, update the current signal strength, // Or, check if user pressed any button for callling or SMS, // If sucessful go to wait state otherwise send again, //Sending call action, similar process as above, * Function to get the service provider(SP) name, //AT command for getting serivce provider name, // Fuciton to print current signal strength on lcd, //It recives a the char value of key pressed and stores it into, // This is to switch on the messaging mode of Gsm, //Prints the msg on serial as soon as it arrives, * Output: True: A response( call or sms) incoming, Or false, //In case of incoming recieve until halt_fetch() gives true, //Capture the time of start of message receiving, *The function is created to halt or to indicate the end of receiving, *It does that by a timeout of 3sec or Response Text limit of 500 characters, *Output: Boolean, T= halt fetching F= Wait for message, * Caller id is between first and second quotes, * While, Text message is after last quotes, //In case u want to see everything incoming, //If the reponse has these two thing that means it is a 'real' response, // Find the indexes of all the quotes in the stirng and sets them up in gloablevariable: indexOfQuotes[index], // Determine weather the response is of call or sms, * This function is used after two user get connected on a call, * It waits '#' to terminate or 'NO CARRIER' on serial monitor, // Function to update the value as arduino internal clock, //Check if 'NO CARRIER' is printer on Serial monitor, // A Fuciton to check the lenth of number calling should be 10 + ('+91' country code) =13, //Essential command to determine the state of GSM module, /*************************************************************, *************************************************************/, * Waits till user enter a ten Digit number, Automatic Street Light using 555 Timer Circuit & LDR, IoT Based TDS Meter using ESP8266 for Water Quality Monitoring, Wireless AC Light Dimmer with Android Bluetooth & Arduino, How to Stream Videos From Your Mobile to TV Screen, Interfacing NRF24L01 Transceiver Module with STM32 Tx/Rx, Intel 9th Generation Processors Announced – Intel VS AMD Processors, Square Wave Generator Circuit with Op-Amp IC 741, Nextion Display Based Mobile Phone using GSM & Arduino, Gas Leakage Detector with SMS Alert using GSM Module & Arduino, IoT Based Patient Health Monitoring using ESP8266 & Arduino, Password Based Door Lock Security System Using Arduino & Keypad, Interfacing MAX30100 Pulse Oximeter Sensor with Arduino, ECG Graph Monitoring with AD8232 ECG Sensor & Arduino, Temperature Based Fan Speed Control & Monitoring With Arduino, Interface Capacitive Soil Moisture Sensor v1.2 with Arduino, IoT Weighing Scale with HX711 Load Cell & ESP8266, Blood Oxygen & Heart Rate Monitor with MAX30100 & Arduino, Weighing Machine using Arduino Load Cell & HX711 Module, MAX30100 Pulse Oximeter with ESP8266 on Blynk IoT App.

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