# Folks, I am new to Arduino. Need help to automate water tank (water quantity) **URL:** \ **Category:** General Guidance\ **Created:** [September 24, 2017, 7:01am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150 "2017-09-24T07:01:26Z")\ **Posts on this page:** 9\ **Page:** 2
**Author:** ![somairm](https://avatars.discourse-cdn.com/v4/letter/s/e9bcb4/32.png) [@somairm](https://forum.arduino.cc/u/somairm)\ **Post date:** [October 2, 2017, 10:29am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/21 "2017-10-02T10:29:27Z")
Hello Based on the below code how to connect the sensor to microprocessor \ _-----( Setup function )-----_/ void setup() { Serial.begin(9600); pinMode(8, INPUT\_PULLUP); } /_-----( Loop function )-----_/ void loop() { boolean run\_cycle = true; const int lowerSersor = digitalRead(8); // lower float sensor on digital pin 8 if (lowerSersor == LOW) { // float sensor has dropped down - tank empty // Toggle on if (run\_cycle) { sendSMS(); run\_cycle = false; } } if (lowerSensor == HIGH) { // tank now full // Toggle off if (run\_cycle == false) { run\_cycle = true; } } } void sendSMS() { // Some code here to send a sms Serial.println("AT"); delay(1000); Serial.println("AT+CMGF=1"); // send SMS in text mode delay(1000); Serial.println("AT+CMGS="+01XXXX""); //CHANGE TO Number , you'd like to receive message delay(1000); Serial.print("Water level is low in underground tank (attention required)"); // content of the message Serial.write(26); // ctrl+z ASCII code } ---
**Author:** ![wvmarle](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/wvmarle/32/1013044_2.png) [@wvmarle](https://forum.arduino.cc/u/wvmarle)\ **Post date:** [October 3, 2017, 2:36am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/22 "2017-10-03T02:36:20Z")
Please add code tags when posting code (the \ button in the editor) as there are smileys in the code. Anyway based on what I can read: sensor is expected to connect to pin 8, and just acts like a regular switch, active LOW. ---
**Author:** ![somairm](https://avatars.discourse-cdn.com/v4/letter/s/e9bcb4/32.png) [@somairm](https://forum.arduino.cc/u/somairm)\ **Post date:** [October 12, 2017, 6:14am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/23 "2017-10-12T06:14:50Z")
Hello.. when i copy past the code to UNO it give me following error Arduino: 1.8.4 (Mac OS X), Board: "Arduino/Genuino Uno" /Users/Omair/Downloads/F1ILXY7IDIN9JKB/F1ILXY7IDIN9JKB.ino: In function 'void loop()': F1ILXY7IDIN9JKB:15: error: 'sendSMS' was not declared in this scope sendSMS(); ^ F1ILXY7IDIN9JKB:19: error: 'lowerSensor' was not declared in this scope if (lowerSensor == HIGH) { // tank now full ^ /Users/Omair/Downloads/F1ILXY7IDIN9JKB/F1ILXY7IDIN9JKB.ino: In function 'void setup()': F1ILXY7IDIN9JKB:33: error: redefinition of 'void setup()' void setup() ^ /Users/Omair/Downloads/F1ILXY7IDIN9JKB/F1ILXY7IDIN9JKB.ino:2:6: note: 'void setup()' previously defined here void setup() { ^ /Users/Omair/Downloads/F1ILXY7IDIN9JKB/F1ILXY7IDIN9JKB.ino: In function 'void loop()': F1ILXY7IDIN9JKB:41: error: redefinition of 'void loop()' void loop() ^ /Users/Omair/Downloads/F1ILXY7IDIN9JKB/F1ILXY7IDIN9JKB.ino:8:6: note: 'void loop()' previously defined here void loop() { ^ exit status 1 'sendSMS' was not declared in this scope This report would have more information with "Show verbose output during compilation" option enabled in File -\> Preferences. ---
**Author:** ![TomGeorge](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/tomgeorge/32/215261_2.png) [@TomGeorge](https://forum.arduino.cc/u/TomGeorge)\ **Post date:** [October 12, 2017, 7:19am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/24 "2017-10-12T07:19:02Z")
Hi, Please read the first post in any forum entitled how to use this forum. [http://forum.arduino.cc/index.php/topic,148850.0.html](http://forum.arduino.cc/index.php/topic,148850.0.html) then look down to item #7 about how to post your code. It will be formatted in a scrolling window that makes it easier to read. Thanks.. Tom... 🙂 ---
**Author:** ![somairm](https://avatars.discourse-cdn.com/v4/letter/s/e9bcb4/32.png) [@somairm](https://forum.arduino.cc/u/somairm)\ **Post date:** [October 12, 2017, 8:23am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/25 "2017-10-12T08:23:16Z")
Hello. Somehow I am not able to see this \<\> in the editor. ---
**Author:** ![somairm](https://avatars.discourse-cdn.com/v4/letter/s/e9bcb4/32.png) [@somairm](https://forum.arduino.cc/u/somairm)\ **Post date:** [October 12, 2017, 8:29am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/26 "2017-10-12T08:29:32Z")
Hello... Need some help Getting error message when verifying the code. Error message attached as attachment. ```cpp /*-----( Setup function )-----*/ void setup() {   Serial.begin(9600);   pinMode(8, INPUT_PULLUP); } /*-----( Loop function )-----*/ void loop() {   boolean run_cycle = true;   const int lowerSersor = digitalRead(8); // lower float sensor on digital pin 8   if (lowerSersor == LOW) { // float sensor has dropped down - tank empty     // Toggle on     if (run_cycle) {       sendSMS();       run_cycle = false;     }   }   if (lowerSensor == HIGH) { // tank now full     // Toggle off     if (run_cycle == false) {       run_cycle = true;     }   } } //ERFINDER CODE #include SoftwareSerial mySerial(9, 10); void setup() {   mySerial.begin(9600);  // Setting the baud rate of GSM Module    Serial.begin(9600);    // Setting the baud rate of Serial Monitor (Arduino)   delay(100); } void loop() {   if (Serial.available()>0)   switch(Serial.read())   {     case 's':       SendMessage();       break;     case 'r':       RecieveMessage();       break;   } if (mySerial.available()>0)   Serial.write(mySerial.read()); } void SendMessage() {   mySerial.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode   delay(1000);  // Delay of 1000 milli seconds or 1 second   mySerial.println("AT+CMGS=\"+923400008550\"\r"); // Replace x with mobile number   delay(1000);   mySerial.println("I am SMS from GSM Module");// The SMS text you want to send   delay(100);   mySerial.println((char)26);// ASCII code of CTRL+Z   delay(1000); } void RecieveMessage() {   mySerial.println("AT+CNMI=2,2,0,0,0"); // AT Command to recieve a live SMS   delay(1000); } ``` ![Screen Shot 2017-10-12 at 13.28.32.png](https://europe1.discourse-cdn.com/arduino/original/4X/8/9/e/89e6b937b69a1cf23ec9899e5482684369f32d65.png) ---
**Author:** ![wvmarle](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/wvmarle/32/1013044_2.png) [@wvmarle](https://forum.arduino.cc/u/wvmarle)\ **Post date:** [October 12, 2017, 8:44am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/27 "2017-10-12T08:44:53Z")
The error message: > 'sendSMS()' was not declared in this scope. True. Maybe you forgot to write that function? ---
**Author:** ![somairm](https://avatars.discourse-cdn.com/v4/letter/s/e9bcb4/32.png) [@somairm](https://forum.arduino.cc/u/somairm)\ **Post date:** [October 12, 2017, 9:54am UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/28 "2017-10-12T09:54:12Z")
Hello Edison. Still it is giving me error. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [May 5, 2021, 6:21pm UTC](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150/29 "2021-05-05T18:21:08Z")
[Previous page](https://forum.arduino.cc/t/folks-i-am-new-to-arduino-need-help-to-automate-water-tank-water-quantity/482150.md?page=1)