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SMS relay controller

 

About SMS relay controller Arduino project


Very low signal area? Simple remote control solution required? Tired of unexpected complications? In this IoT driven world, some oldies but goldies implementations as this relay(s) controlled by SMS still takes the spotlight. Forget fancy implementation, just KISS!


Project required time*

  • Hardware side: around 5-10 minutes.
  • Arduino classes install: 5-10 minutes.
  • Arduino software side: 5 minutes.
* The implementation time may vary depending on previous user experience. Difficulty level - beginner / intermediate.

 

 

 

SMS relay controller - required shields and materials


* 1 pcs. x xyz-mIoT by itbrainpower.net equipped with Quectel M95FA P/N: XYZMIOT209#M95FA-UFL-0000000 - [BG96 version - P/N: XYZMIOT209#BG96-UFL-0000000 can be use as well]


 

 

* 1 pcs. x 1 cell LiPO battery
* 1 pcs. x GSM embedded antenna
* 1 or 2 pcs. x 2 x RELAY shield 5V - we used the Polulu 2-Channel SPDT Relay Carrier with 5VDC Relays
* 1 pcs. 5V power wall adapter
* connecting wires


Additional hardware references


 

 

SMS relay controller hardware integration (wiring)


First, identify if your relays are 5V or 12V compliant! For boards having 5V relays, wire as bellow:

SMS relay controller wiring xyz-mIoT by itbrainpower.net shield wiring with two relays - 5V - board



HINT, for 12V relays:
*         RELAY shield Vin pin (in above picture, it's the RED wire, on the right side, marked +5V) should be connected to +12V power source and the GND pin should be connected to both xyz-mIoT GND and 12V power source GND.




SMS relay controller Arduino software


a. download xyz-mIoT shields Arduino class from: here. Expand the archive and follow the install instructions.

b. Make a folder named "SMS-relay-controller".
Copy the code bellow, paste it one new file and save the file as "SMS-relay-controller.ino" in the folder created in previously or, you may download it from here (right click & save as): SMS relay controller - control relay(s) via SMS Arduino code

1/*
2SMS-relay-controller.ino v 0.4/20190712 - for xyz-mIoT shields
3COPYRIGHT (c) 2015-2019 Dragos Iosub / R&D Software Solutions srl
4
5You are legaly entitled to use this SOFTWARE ONLY IN CONJUNCTION WITH xyz-mIoT DEVICES USAGE. Modifications, derivates and redistribution 
6of this software must include unmodified this COPYRIGHT NOTICE. You can redistribute this SOFTWARE and/or modify it under the terms 
7of this COPYRIGHT NOTICE. Any other usage may be permited only after written notice of Dragos Iosub / R&D Software Solutions srl.
8
9This SOFTWARE is distributed is provide "AS IS" in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied 
10warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11
12IMPORTANT NOTICE!
13Before use xyz-mIoT shields, you must download and install "xyz-mIoT shields Arduino class" from https://itbrainpower.net/downloads#xyz-mIoT 
14
15In order to compile this code following additional files are required: "XYZMIOT_basic_lbr.h", "XYZMIOT_basic_lbr.ino", "XYZMIOT_SMS_lbr.h" 
16and "XYZMIOT_SMS_lbr.ino". Those files can be found in "xyz-mIoT kickstart for Arduino" available for download at: 
17https://itbrainpower.net/downloads#xyz-mIoT 
18
19Copy this four file in the same folder where is this source file (SMS_relay_controller.ino)! 
20
21
22Dragos Iosub, Bucharest 2019.
23http://itbrainpower.net
24*/
25
26//#define modemType   BG96            // choose this for xyz-mIoT equipped with BG96 shield
27#define modemType   M95FA             // choose this for xyz-mIoT equipped with M95FA shield
28
29static char phoneNumber[15] = "0700111222";       //replace with your destination number
30//#define FourRelays                              //remove comment to use it with 4 relays output
31
32#define OutPort0   8                //Arduino digital port used to drive Relay0
33#define OutPort1   9                //Arduino digital port used to drive Relay1
34#define OutPort2   10               //Arduino digital port used to drive Relay2
35#define OutPort3   11               //Arduino digital port used to drive Relay3
36
37
38
39//#define atDebug             //remove comment if you want to supervise modem chat in Serial Monitor
40//#define SMSLibDebug         //remove comment if debug SMS it's required
41
42
43static char notunderstand[74] = "? relay0,relay1,relay2,relay3 >> 1 ->activate relay, 0 ->release relay";
44static char executed[40] = " cmd executed";
45static char boot[13] = "BOOT EVENT ";
46
47
48
49/*#####NO REALLY NEED TO CHANGE PARAMS BELLOW#####*/
50#define agsmSerial Serial
51#define BUFFDSIZE 1024
52
53#include "Arduino.h"
54#include "XYZMIOT_basic_lbr.h"
55#include "XYZMIOT_SMS_lbr.h"
56//#include "modems_network.h"
57
58#define BUFFDSIZE 1024              //used by modem library
59
60
61char ch;
62char buffd[BUFFDSIZE];
63char readBuffer[200];
64int state=0, i=0, powerState = 0; 
65
66
67void procRespose(char* msg){
68    memset(readBuffer,0x00,sizeof(readBuffer));
69    sprintf(readBuffer, "%s", msg);
70    SerialUSB.println(readBuffer);
71    SerialUSB.flush();
72    delay(150);
73    sendSMS(phoneNumber, readBuffer);     //confirm command 
74    delay(100);
75}
76
77void setup(){
78  
79    pinMode(OutPort0, OUTPUT);        //configure the Dxx as output
80    pinMode(OutPort1, OUTPUT);        //configure the Dxx as output
81    digitalWrite(OutPort0, 0);
82    digitalWrite(OutPort1, 0);
83    #if defined(FourRelays)
84      pinMode(OutPort2, OUTPUT);        //configure the Dxx as output
85      pinMode(OutPort3, OUTPUT);        //configure the Dxx as output
86      digitalWrite(OutPort2, 0);
87      digitalWrite(OutPort3, 0);
88    #endif
89  
90    agsmSerial.begin(115200);
91    SerialUSB.begin(115200);//1ms
92    delay(3000);
93  
94    clearagsmSerial();
95    clearSerial();
96    delay(10);
97  
98    modemHWSetup();             //configure Arduino IN and OUT to be used with modem
99    
100    SerialUSB.flush();
101    agsmSerial.flush();
102
103    SerialUSB.println(F("xyz-mIoT boot.."));
104    SerialUSB.flush();
105
106    
107    powerOnModem();
108  
109    clearBUFFD();
110    while(strlen(buffd)<1){
111      getIMEI();
112      delay(500);
113    }
114  
115    ready4SMS = 0; 
116    ready4Voice = 0;
117  
118    setupMODEMforSMSusage();
119  
120    SerialUSB.println(F("xyz-mIoT ready.. let's proceed"));
121    SerialUSB.flush();
122    delay(100);
123  
124    procRespose((char*)boot);     //send SMS 
125  
126}
127
128int checkSMSAuthNo(int SMSindex){
129    int ret = 0;
130    clearBUFFD();
131    if(ready4SMS != 1) setupMODEMforSMSusage();
132    if(totSMS<1) listSMS();
133    if(SMSindex > noSMS || SMSindex < 1) return -1;
134
135    clearagsmSerial();
136    agsmSerial.print("AT+CMGR=");//send command to modem
137    agsmSerial.print(SMSindex);//send command to modem
138    agsmSerial.println(",0");//send command to modem
139    delay(1);
140
141    readline();//just 2 remove modem cmd echo
142    readline();//just 2 read second line ==> (containing OK / +CMS ERROR / SMS header)
143
144    SerialUSB.println(buffd);
145
146    if(strstr(buffd, phoneNumber)) ret = 1;
147    clearBUFFD();
148    clearagsmSerial();  
149    
150    return ret;
151}
152
153void loop(){
154  //process SMS commands - start
155  listSMS();                                //find the last used SMS location
156  clearagsmSerial();
157  int cnt;
158  cnt = noSMS;
159  while (cnt>0){
160    if(checkSMSAuthNo(cnt)<1){
161      deleteSMS(cnt);
162      SerialUSB.println("no auth no");
163      clearBUFFD();
164    }
165    else{
166      readSMS(cnt);                           //the SMS content will be returned in buffd 
167      SerialUSB.print(F("SMS content: "));SerialUSB.flush();delay(50);
168      SerialUSB.println(buffd);SerialUSB.flush();delay(50);
169    }
170    //here process SMS the content - start
171
172    delay(50);
173    clearagsmSerial();
174    delay(50);
175
176    if(strlen(buffd) > 0){                        //non empty SMS
177      int OutputVal0 = -1;
178      int OutputVal1 = -1;
179
180      #if defined(FourRelays)
181        int OutputVal2 = -1;
182        int OutputVal3 = -1;
183        sscanf(buffd, "%i,%i,%i,%i", &OutputVal0, &OutputVal1, &OutputVal2, &OutputVal3);
184        clearBUFFD();
185        sprintf(buffd, "%i,%i,%i,%i >> %s", OutputVal0, OutputVal1, OutputVal2, OutputVal3, (char*)executed);
186      #else
187        sscanf(buffd, "%i,%i", &OutputVal0, &OutputVal1);
188        clearBUFFD();
189        sprintf(buffd, "%i,%i >> %s", OutputVal0, OutputVal1, (char*)executed);
190      #endif
191
192      SerialUSB.println(buffd);
193      
194      #if defined(FourRelays)
195        if(OutputVal0<0 || OutputVal1<0 || OutputVal2<0 || OutputVal3<0){//check parse message success
196      #else
197        if(OutputVal0<0 || OutputVal1<0){//check parse message success
198      #endif
199        procRespose((char*)notunderstand);
200        //SerialUSB.println("error");
201      } 
202      else{
203        digitalWrite(OutPort0, OutputVal0);
204        digitalWrite(OutPort1, OutputVal1);
205        #if defined(FourRelays)
206          digitalWrite(OutPort2, OutputVal2);
207          digitalWrite(OutPort3, OutputVal3);
208        #endif
209        procRespose(buffd);
210        //SerialUSB.println("fine");
211      }
212
213      deleteSMS(cnt);                         //free the SMS location
214    }
215    //here process SMS the content - end
216    clearBUFFD();
217    clearagsmSerial();
218    cnt--;
219  }
220  //process SMS commands - stop
221  delay(500);
222}
223
224



c. download xyz-mIoT kickstart for Arduino from: here. Expand the archive and copy "XYZMIOT_basic_lbr.h", "XYZMIOT_basic_lbr.ino", "XYZMIOT_SMS_lbr.h" and "XYZMIOT_SMS_lbr.ino" in previous folder.

d. In line 29, update the phoneNumber value with your phone number (will act as MASTER number - only messages received from this number will be processed). Save.

e. Select xyz-mIoT shield board and programming port.
SMS Relay controller - ARDUINO set board and port

REMINDER: In order to be able to upload the code, you must press twice (fast) xyz-mIoT shield RESET switch [the board will enter programming mode].

f. Now, you may compile and upload the code to your xyz-mIoT shield. Debug messages can be seen in Serial Monitor [115200bps,8N,1].



Relay controller SMS commands and replies
Info:
- only messages from MASTER number will be interpreted/executed. Other messages will be deleted from SIM card.


SMS commands accepted by relay controller:
- 2 relays version send relay0,relay1 where relayX can be 1 for activate relay, or 0 for release relay [Eg.: 1,0 - meaning: Relay 0 activated and Relay 1 released]
- 4 relays version send relay0,relay1,relay2,relay3 where relayX can be 1 for activate relay, or 0 for release relay


Relay controller originated / reply messages:
- at BOOT, the relay controller will send "BOOT" message to MASTER number;
- in case of accurate commands, the controller will reply with received command + content defined in variable executed;
- in case of messages parsing error, the controller will reply with a sort of help message [defined by notunderstand content];





TUTORIAL PROVIDED WITHOUT ANY WARRANTY!!! USE IT AT YOUR OWN RISK!!!!

 

 

 

 

 

 

Original how to written by Dragos Iosub & itbrainpower.net team

 

 

 

 

document version 1.01 / 2019-07-12 © R&D Software Solutions srl