1 | #include <SoftwareSerial.h> // Lets include the software serial library
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2 | char inchar; // Will hold the incoming character from the GSM shield
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3 | SoftwareSerial SIM900(7, 8); // We will use pins 7 and 8 for the software serial
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4 | const byte phoneNumberAmount = 2; // How many phone numbers can control this device
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5 | boolean canControl = true; // A flag if checked phone numbers can control this device
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6 | boolean powerDown = false; // Is the GPRS shield powered down
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7 | int phoneNumberLength = 12; // Length of the phone number, international syntax without the + sign at the front
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8 | int relay = 5; // Relay pin number
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9 | char phoneNumbers[] = "358401111111,358401111112"; // Phone numbers that can control this device, international format without the + sign at the front
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10 | String alarmPhoneNumber = "358401111111"; // The number where the alarm for the battery voltage is sent to
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11 | char rcvPhoneNumberArr[13]; // Received phone number
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12 | float correctionValue = 1.661705f; // Correction value for the battery voltage
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13 | int batteryVoltage = 0; // Read the digital value of the battery voltage
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14 | float voltage = 0.0f; // The voltage value
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15 | float alarmVoltageLimit = 12.00f; // If the voltage goes under this value, an alarm text will be send to a phone number
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16 | float webastoMinVoltage = 12.15f; // The minimun voltage required to start Webasto
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17 | // State of charge Sealed or flooded lead acid Gel battery AGM battery
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18 | // 100% 12.70+ 12.85+ 12.80+
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19 | // 75% 12.40 12.65 12.60
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20 | // 50% 12.20 12.35 12.30
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21 | // 25% 12.00 12.00 12.00
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22 | // 0% 11.80 11.80 11.80
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23 | // http://www.energymatters.com.au/components/battery-voltage-discharge/
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24 |
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25 | // Set up arduino and the SIM900 shield
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26 | void setup() {
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27 |
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28 | Serial.begin(19200); // Serial with 19200 baudrate
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29 | pinMode(9, OUTPUT); // Change pin 9 to output so we can power the SIM900 on
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30 | pinMode(relay, OUTPUT); // Set the relay pin as output
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31 | digitalWrite(relay, HIGH); // Set the relay pin high
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32 | SIM900power(); // Wake up the GSM shield
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33 | // SIM900.println("AT+CPIN=1234"); // If your sim card has pin code
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34 | SIM900.begin(19200); // We will use the same baudrate for the SIM900 module
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35 | delay(20000); // Will wait for 20 seconds for the SIM900 to logon to a network
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36 | SIM900.print("AT+CMGF=1\r"); // Set SMS mode to text
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37 | delay(100); // Will wait for 0.1 seconds
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38 | SIM900.print("AT+CNMI=2,2,0,0,0\r"); // Blurt out contents of new SMS upon receipt to the GSM shield's serial out
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39 | delay(100); // Will wait for 0.1 seconds
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40 | Serial.println("Ready..."); // Lets print that the SIM900 module is ready for use
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41 | }
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42 |
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43 | // Power the SIM900 module using software commands, this will only work if the JP is soldered
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44 | void SIM900power() {
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45 |
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46 | digitalWrite(9,LOW);
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47 | delay(1000);
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48 | digitalWrite(9,HIGH);
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49 | delay(2000);
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50 | digitalWrite(9,LOW);
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51 | delay(3000);
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52 | }
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53 |
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54 | // Main loop
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55 | void loop() {
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56 |
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57 | // Read the digital value for the battery voltage
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58 | batteryVoltage = analogRead(A2);
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59 |
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60 | // Convert the value to 12 volts
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61 | voltage = batteryVoltage * (12 / 1023.0);
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62 |
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63 | // Correct the voltage value
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64 | voltage = voltage * correctionValue;
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65 |
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66 | // If voltage is under the set value of alarm
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67 | if(voltage < alarmVoltageLimit && powerDown == false) {
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68 |
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69 | // Send the alarm text to car owner
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70 | sendAlarmText();
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71 |
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72 | // Power the SIM900 shield down to save power
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73 | SIM900power();
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74 |
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75 | // Set the flag that the SIM900 shield has been powered down to save power
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76 | powerDown = true;
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77 | }
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78 |
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79 | if(voltage >= alarmVoltageLimit && powerDown == true) {
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80 |
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81 | // Power the SIM900 shield up
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82 | SIM900power();
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83 | SIM900.begin(19200); // We will use the same baudrate for the SIM900 module
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84 | delay(20000); // Will wait for 20 seconds for the SIM900 to logon to a network
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85 | SIM900.print("AT+CMGF=1\r"); // Set SMS mode to text
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86 | delay(100); // Will wait for 0.1 seconds
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87 | SIM900.print("AT+CNMI=2,2,0,0,0\r"); // Blurt out contents of new SMS upon receipt to the GSM shield's serial out
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88 | delay(100); // Will wait for 0.1 seconds
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89 |
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90 | // Set the flag that the SIM900 shield has been powered back up
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91 | powerDown = false;
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92 | }
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93 |
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94 | // If there is a character coming from the SIM900 shield
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95 | if(SIM900.available() > 0) {
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96 |
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97 | // Read a character
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98 | inchar = SIM900.read();
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99 |
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100 | // If character is ", we will read the phone number
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101 | if(inchar == '"') {
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102 |
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103 | // Wait for a bit
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104 | delay(20);
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105 |
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106 | // Read the next character
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107 | inchar = SIM900.read();
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108 |
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109 | // If the character is +, the first symbol of the international phone number
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110 | if (inchar == '+') {
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111 |
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112 | // Wait a bit
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113 | delay(20);
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114 |
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115 | // Lets loop for the phone number legnth
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116 | for (int i = 0; i < phoneNumberLength; i++) {
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117 |
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118 | // Lets read a character
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119 | inchar = SIM900.read();
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120 |
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121 | // Wait a bit
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122 | delay(20);
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123 |
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124 | // Will write the received phone number to an array
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125 | rcvPhoneNumberArr[i] = inchar;
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126 | }
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127 |
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128 | // Will check for all of the numbers that can control this device
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129 | for(int a = 0; a < phoneNumberAmount; a++) {
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130 |
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131 | // Lets check all the numbers within the phone number
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132 | for(int i = 0; i < phoneNumberLength; i++) {
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133 |
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134 | // Check if the numbers dont match
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135 | if(phoneNumbers[a * phoneNumberLength + i + a] != rcvPhoneNumberArr[i]) {
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136 |
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137 | // Change the flag value
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138 | canControl = false;
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139 | }
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140 | }
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141 |
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142 | // If the canControl flag is true, we dont need to check other numbers and we can end the loop
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143 | if(canControl && (a != (phoneNumberAmount - 1))) {
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144 |
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145 | break;
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146 | }
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147 | else if(!canControl && (a != (phoneNumberAmount - 1))) {
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148 |
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149 | // If it was false and there is still numbers to check, change the value back to true
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150 | canControl = true;
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151 | }
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152 | }
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153 |
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154 | // Just a test print
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155 | if(canControl) {
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156 |
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157 | Serial.println("This number can control this device");
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158 | }
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159 | else {
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160 |
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161 | Serial.println("This number cannot control this device");
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162 | }
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163 | }
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164 | }
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165 |
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166 | // If the character was #, the character that this circuit uses to send commands
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167 | else if (inchar == '#' && canControl && voltage > webastoMinVoltage) {
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168 |
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169 | // Wait a bit
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170 | delay(10);
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171 |
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172 | // Read the next character
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173 | inchar = SIM900.read();
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174 |
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175 | // If the next character is s
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176 | if (inchar == 's') {
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177 |
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178 | // Wait a bit
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179 | delay(10);
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180 |
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181 | // Read the next character
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182 | inchar = SIM900.read();
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183 |
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184 | // If the character was number 1, we will send high pulse for the webasto controller for a second
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185 | if (inchar == '1') {
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186 |
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187 | // Will change the relay state
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188 | digitalWrite(relay, LOW);
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189 |
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190 | // We will wait for one second
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191 | delay(1500);
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192 |
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193 | // Change the relay state back to high
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194 | digitalWrite(relay, HIGH);
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195 | }
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196 |
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197 | // Wait a bit
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198 | delay(10);
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199 |
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200 | // Will delete all the text messages from the sim, so it doesn't get clocked up
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201 | SIM900.println("AT+CMGD=1,4");
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202 | }
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203 | }
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204 | }
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205 | }
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206 |
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207 | void sendAlarmText() {
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208 |
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209 | delay(100);
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210 | SIM900.print("AT+CMGS=\"+"); // recipient's mobile number, in international format
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211 | delay(100);
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212 | SIM900.print(alarmPhoneNumber); //
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213 | delay(100);
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214 | SIM900.print("\"");
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215 | delay(100);
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216 | SIM900.println();
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217 | delay(100);
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218 | SIM900.print("Car battery charge is under 25%, remote control disabled."); // Message to send
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219 | delay(100);
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220 | SIM900.println((char)26); // End AT command with a ^Z, ASCII code 26
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221 | delay(100);
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222 | SIM900.println();
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223 | delay(10000); // Give the module time to send SMS
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224 | }
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Schaltung.PNG
(71 KB)
