ThingSpeak

Verfolgen

Hi, there ! Need some serious help.... I have trouble trying to upload my data to my Channel. Any ideas to fix it? Below you can see my code: #include <ThingSpeak.h>// Η βιβλιοθήκη του ThingSpeak. #include <SPI.h> #include <Ethernet.h> #include <SoftwareSerial.h> #include <Servo.h> // Η βιβλιοθήκη του σερβοκινητήρα. #include "DHT.h" #include "MQ7.h" //Για τον αισθητήρα DHT11. #define DHTPIN 7 #define DHTTYPE DHT11 DHT dht(DHTPIN, DHTTYPE); //Για τον φωτισμό. #define DELAY 5000 // Καθυστέρηση μεταξύ μετρήσεων σε ms για τον φωτισμό. #define VIN 5 // Τάση 5V. #define R 10000 //Αντίσταση 10.000 Ω. //Για τον αισθητήρα MQ7. int MQ7pin = A0; int MQ7Reading; int MQ7led = 3; //Για τον αισθητήρα Soil. int val; int soil_dig= 8; int soil_analog = A1; //Μεταβλητές για τον φωτισμό και για τον υπολογισμό lux. const int sensorPin = A3; // Το pin στο οποίο συνδέεται ο αισθητήρας. const int led = 12; const int greenled = 10; const int redled = 4; const long onduration = 10000; const long offduration = 30000; int ledstate = HIGH; long remembertime = 0; int sensorVal; // Αναλογική τιμή από τον αισθητήρα. int lux; //Τιμές για τα lux int valvePin = 13; // Το pin στο οποίο συνδέεται το ρελέ, ώστε να ενεργοποιεί την ηλεκτροβάνα. //Για τον αισθητήρα Ultrasonic. #define echoPin 5 // Το echoPin. #define trigPin 6 // To trigPin. long duration; // Η διάρκεια που κάνει το ηχητικό κύμα να ταξιδέψει. int distance; // Ο υπολογισμός της ταχύτητας του ηχητικού κύματος. //Για τον αισθητήρα Rain. const int rain_D = 2;//Ψηφιακή τιμή αισθητήρα βροχής. const int rain_A = A2;//Αναλογική τιμή αισθητήρα βροχής. int rain_val;// Μεταβλητή για την αποθήκευση της τιμής του αισθητήρα βροχής. int r;// Μεταβλητή για την αποθήκευση της τιμής του αισθητήρα βροχής. Servo servo; // Το όνομα του σερβοκινητήρα. int servoPin = 11; // Το pin στο οποίο συνδέεται ο σερβοκινητήρας. #define pwm 9 // Το pin στο οποίο συνδέεται ο ανεμιστήρας. //Σύνδεση String readString; byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //H mac address. byte ip[] = {192,168,2,123}; EthernetClient client; unsigned long myChannelNumber = 1*******; //Ο αριθμός του καναλιού. const char * myWriteAPIKey = "****************"; //Το ΑΡΙ Κey του καναλιού. const int updateInterval = 10000; void setup() { Serial.begin(9600); ThingSpeak.begin(client);// Σύνδεση στο cloud του ThingSpeak. dht.begin(); pinMode(MQ7led, OUTPUT);// Θέτει το led του MQ7 ως OUTPUT. pinMode(trigPin, OUTPUT); // Θέτει το trigPin ως OUTPUT. pinMode(echoPin, INPUT); // Θέτει το echoPin ως INPUT. pinMode(rain_D, INPUT); // Θέτει το rain_D ως INPUT. pinMode(rain_A, INPUT); // Θέτει το rain_A ως INPUT. pinMode(servoPin, OUTPUT);// Θέτει το servoPin ως OUTPUT. servo.attach(servoPin);// Σύνδεση σε pin της μεταβλητής του σερβοκινητήρα. analogWrite(pwm, 255);// Γράφει μία αναλογική τιμή (PWM pin) σε ένα pin. pinMode(soil_analog, INPUT); // Θέτει το soil_analog ως INPUT. pinMode(soil_dig, INPUT);// Θέτει το soil_dig ως INPUT. pinMode(valvePin, OUTPUT); //Θέτει το 13 ως OUTPUT pin, ώστε να στέλνει σήμα στο relay. pinMode(led, OUTPUT); // Θέτει το ledPin ως output. digitalWrite(led,ledstate); pinMode(sensorPin, INPUT);// Θέτει το sensorPin ως INPUT. pinMode(greenled, OUTPUT);// Θέτει το greenled ως OUTPUT. pinMode(redled, OUTPUT);// Θέτει το redled ως OUTPUT. } void loop() { Serial.println(F("======================================")); Serial.println(F("Συνθήκες στο Θερμοκήπιο :")); //DHT11 float t = dht.readTemperature();// Η θερμοκρασία σε °C. float h = dht.readHumidity(); // Η υγρασία του χώρου. float f = dht.readTemperature(true); //Η θερμοκρασία σε °F. // Υπολογισμός του heat index, ο οποίος πρέπει να μετατραπεί σε Fahrenheit. float hi = dht.computeHeatIndex(f, h); Serial.print(F("Temperature: ")); Serial.print(t); Serial.print(F("°C ")); Serial.print(F(" and ")); Serial.print(f); Serial.print(F("°F\t")); Serial.print(F("Humidity: ")); Serial.print(h); Serial.print(F(" %\t")); Serial.print(F("Heat index: ")); Serial.print(hi); Serial.println(F(" °F")); // Έλεγχος της θερμοκρασίας , ώστε να ενεργοποιείται ο ανεμιστήρας όποτε χρειάζεται. if (t == 26) { analogWrite(pwm, 51); Serial.print(F("Ταχύτητα ανεμιστήρα: 20% ")); delay(1000); } else if (t == 30) { analogWrite(pwm, 204); Serial.print(F("Ταχύτητα ανεμιστήρα: 80% ")); delay(1000); } else if (t > 40 ) { analogWrite(pwm, 255); Serial.print(F("Ταχύτητα ανεμιστήρα: 100% ")); delay(1000); Serial.print(F("\t")); } //MQ7 float g = analogRead(MQ7pin); Serial.print(F("MQ7: ")); Serial.println(g); // Έλεγχος της τιμής του MQ7, ώστε να ανάβει το led που αναπαριστά ανεμιστήρα. if ( g < 200) { Serial.println(F("O ανεμιστήρας κλειστός - Φυσιολογική ποσότητα CO στον χώρο εργασίας.")); digitalWrite(MQ7led, LOW); } else if (201 < g && g < 220) { Serial.println(F("Η μέγιστη φυσιολογική ποσότητα CO για χώρους εργασίας ξεπεράστηκε!!!- Λειτουργία εξαερισμού στο 50%.")); digitalWrite(MQ7led,HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); // wait for a second digitalWrite(MQ7led, LOW); // turn the LED off by making the voltage LOW delay(1000); } if (g > 220) { Serial.println(F("Eπικίνδυνα αέρια CO !!!- Λειτουργία εξαερισμού στο 100%.")); digitalWrite(MQ7led, HIGH); // turn the LED on (HIGH is the voltage level) delay(5000); } //Soil Humidity int soil_analog_value = analogRead(soil_analog); soil_analog_value = map(soil_analog_value, 0, 1023, 230, 0);//Συνάρτηση map για μετρατροπή τιμής σε %. val = digitalRead(soil_dig); Serial.print(F("Soil moisture (Αναλογική τιμή) : ")); Serial.print(soil_analog_value); Serial.print(F("\t")); //Έλεγχος υγρασίας εδάφους για αυτόματο πότισμα. if (soil_analog_value < 50) { digitalWrite(valvePin, LOW); //Όταν η τιμή γίνει LOW,τότε και το relay πρέπει να λάβει τιμή LOW. Serial.println(F("relay on")); } else { digitalWrite(valvePin, HIGH); //Όταν η τιμή γίνει HIGH, τότε και το relay πρέπει να λάβει τιμή HIGH. Serial.println(F("relay off")); } //Ultrasonic Sensor // Αρχικοποίηση του trigPin. digitalWrite(trigPin, LOW); delayMicroseconds(2); // Το trigPin σε HIGH (ACTIVE) για 10 μs. digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); //Διαβάζει το echoPin, επιστρέφει το χρόνο του ηχητικού κύματος σε μs. duration = pulseIn(echoPin, HIGH); // Υπολογισμός απόστασης. distance = (duration - 10) * 0.034 / 2; Serial.println(""); Serial.print(F("Distance: ")); Serial.print(distance); Serial.print(F(" cm")); //Rain Sensor rain_val = digitalRead(rain_D); r = analogRead (rain_A); r = abs ((100*r-40000)/623); Serial.println(F("")); Serial.print(F("Rain (Αναλογική τιμή) :")); Serial.print(r); Serial.print(F("\t")); Serial.print(F("Rain (Ψηφιακή τιμή) :")); Serial.print(rain_val); //Έλεγχος για λειτουργία του σερβοκινητήρα. if ((rain_val != HIGH) && (distance < 9)) { servo.write(0); } if ((rain_val != HIGH) && (distance > 9)) { servo.write(90); } else { servo.write(0); } //Μέτρηση τιμής της φωτοαντίστασης και μετατροπή σε lux. sensorVal = analogRead(sensorPin); lux=sensorRawToPhys(sensorVal); Serial.print("Raw value from sensor= "); Serial.println(sensorVal); //Τύπωση αναλογικής τιμής. Serial.print("Physical value from sensor = "); Serial.print(lux); //Τύπωση αναλογικής τιμής. Serial.println(" lumen"); //Συνθήκες για το άνοιγμα των led και των κουρτινών σκίασης σε διάφορες γωνίες. if (ledstate == HIGH){ if((millis() - remembertime) >= onduration){ ledstate = LOW; remembertime = millis(); } } if (ledstate == LOW){ if((millis() - remembertime) >= offduration){ ledstate = HIGH; remembertime = millis(); } } //Lux. if (lux < 100){ digitalWrite(led, HIGH); if (lux < 200){ digitalWrite(greenled, ledstate); if (lux < 300){ digitalWrite(redled, ledstate); }}} if(lux > 350){ digitalWrite(redled, LOW); if(lux > 450){ digitalWrite(greenled, LOW); if (lux>600){ digitalWrite(led, LOW); }}} else digitalWrite(led,ledstate); //Τα δεδομένα για το ThingSpeak, τα οποία στέλνονται στα αριθμημένα fields. ThingSpeak.writeField(myChannelNumber,1,t, myWriteAPIKey); ThingSpeak.writeField(myChannelNumber,2,h ,myWriteAPIKey); ThingSpeak.writeField(myChannelNumber,3,g ,myWriteAPIKey); ThingSpeak.writeField(myChannelNumber,4,soil_analog_value, myWriteAPIKey); ThingSpeak.writeField(myChannelNumber,5,distance, myWriteAPIKey); ThingSpeak.writeField(myChannelNumber,6,r, myWriteAPIKey); delay(15000); } int sensorRawToPhys(int raw){ // Conversion rule float Vout = float(raw) * (VIN / float(1023));// Conversion analog to voltage float RLDR = (R * (VIN - Vout))/Vout; // Conversion voltage to resistance int phys=500/(RLDR/1000); // Conversion resitance to lumen return phys; } Failing to send data to ThingSpeak Using Arduino Ethernet Shield Please consider starting with the code from the ThingSpeak library for arduino. Are you seeing any data in ThingSpeak? What have you tried? To write multiple fields, use setfield and then write fields. See the examples in the library for the correct syntax. The way you have it is for seperate writes to each field. The first one might work, but the next five would be rejected for being too fast. I also tried the following : ThingSpeak.setField(1,t); ThingSpeak.setField(2,h); int x = ThingSpeak.writeField(myChannelNumber, 1, t, myWriteAPIKey); if(x == 200){ Serial.println("Channel update successful."); } else{ Serial.println("Problem updating channel. HTTP error code " + String(x)); } This returns back the error -302. I can't find how to fix this error. Did you look at the examples in the library? You are using the wrong functions. Yes, you are right. I managed to create the following, but without any luck. (I followed the examples.) ThingSpeak.setField(1,t); ThingSpeak.setField(2,h); int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey); if(x == 200){ Serial.println("Channel update successful."); } else{ Serial.println("Problem updating channel. HTTP error code " + String(x)); } delay(16000); I think I use the functions the right way now, but still I can't send anything to ThingSpeak. It still returns -302 error, but I can't find anything about that. Thanks! Im glad you checked out the library. Sorry it is still not working. Can you confirm that you can update your channel via http in a browser window? You can get the right fromat from the API keys tab of your channel. You can see the -302 error on the Thingspeak library main github page, but its not very helpful description. Can you share the part of your code where you instantiate the HTTP client? Usually there is a wifi client but that wont be needed in your case. You may need an ethernet client using another library. If the browser writing works, I would try writing a single field, using the command you had before (but just one of them). If that still fails, I would try switching to a different network. A 302 means there is a network redirection happening. Perhaps your network has a proxy that is doing redirects. Perhaps try moving your device to a different network? Well I use the following; //Σύνδεση String readString; byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //H mac address. byte ip[] = {192,168,2,123}; EthernetClient client; unsigned long myChannelNumber = 1*******; //Ο αριθμός του καναλιού. const char * myWriteAPIKey = "****************"; //Το ΑΡΙ Κey του καναλιού. const int updateInterval = 10000; void setup() { Serial.begin(9600); ThingSpeak.begin(client);// Σύνδεση στο cloud του ThingSpeak. } If I use the Ethernet.begin(mac,ip) function, it sends data, but it also laggs the rest code. To answer your question, when I update the channel via browser window it returns a number, which is the number of the total values in my channel, (plus one, which I think is the new value from the update it does). For example, before I opened the link, the total values where 18075 and when the window opened, it showed 18076. I also tried to write just one field, but it fails. So I think I have to find a way to use a different network. Any suggestions? Well, I think the solution may be to use a different network. How can I do that? Its definitely not a long term solution, but take the device to your friends house, or work, (or your friends work),or home or school and try it there. That way we will know if it is the network. It does seem unlikely that that is the issue since your browser based post worked fine. Another option you can try would be to use the MQTT interface, but that will be a little more work. Please refer to the documentation for Ethernet.begin. If you do not do that, your network connectivity is not established and it is no wonder you are getting a 302 - because your code can't reach the ThingSpeak server. Yes I get it, but I can't understand why the code does not work well when I use the function Ethernet.begin. All the devices I have in the system start to malfunction. So, if I use it I send data, but my system is problematic. If I don't, I have a fully functional system but it can't send any data. Is there a way to have them both? I suggest you strip everything out, and start with just the ethernet code and thingspeak writing a constant number. Then add the sensors in one by one to see which is causing the problem. I have done it before and I did it again. I think it has to do with the interrupts of Ethernet library which causes jitter in the Servo library interrupt timings. The same thing is happening with the solenoid valve. Someone had posted to the forum the same problem but he couldn't find a solution. Is there a library which doesn't need interrupts (for Servo)? I suggest upgrading your hardware. My code for the esp32 works fine with servo and wifi connection to ThingSpeak (with various other GPIO in use). You can also get an MKR1000, or MKR1010, or nano 33 IoT. Perhaps the limited Uno memory is making hardware resources unavailable. arduino sensors thingspeak ethernet shield multiple fields

Hi all, I am trying to create a complete learning unit online using laravel. The unit of work is in Internet of Things. Hardware will be provided to students - Its a microbit plus the DFRobot Environment science expansion kit (https://www.dfrobot.com/product-2194.html) . All the video tutorials and project work is assigned via the laravel lms.They will log into the lms via their microsoft logins. My next step is to simplify the process of users accessing the mathworks account. I would like to pre assign channels for students with API keys to write sensor values from each of their microbit shields to the cloud. Has anyone tried to do this or has any suggestions how to? The advantages of students having their own channels on my account is for me to monitor how they are progressing. These are year 9 students at high school who have never done any IoT or mathworks/thingspeak related content before. User generation for channels for IoT Shield You can use the create channel API to create new channels for your students. The response to the request has the API kiy and channel ID in it. microbit dfrobot iot sensors api laravel lms

I have created 3 fields for 3 of my sensor datas (gsr sensor, dht22 temperature and humidity sensor) . But the values are not updated into their respective fields simultaneously. I have written the code as follows, it would be very kind if someone could help me out. Thank you. #include <dht.h> #include <SoftwareSerial.h> dht DHT; #define DHT11_PIN 12 #define RX 2 #define TX 3 const int GSR=A2; int sensorValue=0; int gsr_average=0; String AP = "XXXXXXXXXXX"; // AP NAME String PASS = "XXXXXXXXXXXXX"; // AP PASSWORD String API = "YYYYYYYYYYYY"; // Write API KEY String HOST = "api.thingspeak.com"; String PORT = "80"; //String field = "field1"; int countTrueCommand; int countTimeCommand; boolean found = false; //int valSensor=1; SoftwareSerial esp8266(RX,TX); void setup() { Serial.begin(9600); esp8266.begin(115200); sendCommand("AT",5,"OK"); sendCommand("AT+CWMODE=1",5,"OK"); sendCommand("AT+CWJAP=\""+ AP +"\",\""+ PASS +"\"",20,"OK"); } void loop() { //valSensor = getSensorData(); sendtoServer(); } String getTemperatureValue(){ int chk = DHT.read22(DHT11_PIN); float t= DHT.temperature; Serial.print(" Temperature(C)= "); Serial.println(DHT.temperature); delay(50); return String (t); } String getHumidityValue(){ // int chk = DHT.read22(DHT11_PIN); float h= DHT.humidity; Serial.print(" Humidity in %= "); Serial.println(DHT.humidity); delay(50); return String (h); } String getGSRValue(){ long sum=0; for(int i=0;i<10;i++) //Average the 10 measurements to remove the glitch { sensorValue=analogRead(GSR); sum += sensorValue; delay(5); } gsr_average = sum/10; Serial.println(gsr_average); return String(gsr_average); } void sendtoServer(){ String getData = "GET /update?api_key="+ API +"&field1="+ getGSRValue(); sendCommand("AT+CIPMUX=1",5,"OK"); sendCommand("AT+CIPSTART=0,\"TCP\",\""+ HOST +"\","+ PORT,15,"OK"); sendCommand("AT+CIPSEND=0," +String(getData.length()+4),4,">"); esp8266.println(getData);delay(1000);countTrueCommand++; sendCommand("AT+CIPCLOSE=0",5,"OK"); String getData2 = "GET /update?api_key="+ API +"&field2="+ getTemperatureValue(); sendCommand("AT+CIPMUX=1",5,"OK"); sendCommand("AT+CIPSTART=0,\"TCP\",\""+ HOST +"\","+ PORT,15,"OK"); sendCommand("AT+CIPSEND=0," +String(getData2.length()+4),4,">"); esp8266.println(getData2);delay(500);countTrueCommand++; sendCommand("AT+CIPCLOSE=0",5,"OK"); String getData3 = "GET /update?api_key="+ API +"&field3="+ getHumidityValue(); sendCommand("AT+CIPMUX=1",5,"OK"); sendCommand("AT+CIPSTART=0,\"TCP\",\""+ HOST +"\","+ PORT,15,"OK"); sendCommand("AT+CIPSEND=0," +String(getData3.length()+4),4,">"); esp8266.println(getData3);delay(250);countTrueCommand++; sendCommand("AT+CIPCLOSE=0",5,"OK"); } void sendCommand(String command, int maxTime, char readReplay[]) { Serial.print(countTrueCommand); Serial.print(". at command => "); Serial.print(command); Serial.print(" "); while(countTimeCommand < (maxTime*1)) { esp8266.println(command);//at+cipsend if(esp8266.find(readReplay))//ok { found = true; break; } countTimeCommand++; } if(found == true) { Serial.println("OYI"); countTrueCommand++; countTimeCommand = 0; } if(found == false) { Serial.println("Fail"); countTrueCommand = 0; countTimeCommand = 0; } found = false; }

Hello! I'd like to know if Proteus 8 Professional simulation can send sensor data directly to Thingspeak cloud without any hardware implementation and how to do that. Thank you!

Some scripts for obtaining data from ThingSpeak API and then notify a user via Telegram API