在此 scope 中未聲明“Blynk”

Question

我正在用我的 Esp32 做一個 arduino 項目，我從教科書上得到了代碼。 9/10 倍的代碼永遠不會在教科書上工作，而且這個人沒有回應我的評論。 無論如何，它應該是一個使用傳感器 DHT 22 和電容式濕度傳感器的物聯網花園。 假設通過 Blynk 應用程序運行，但代碼都搞砸了。 最初的代碼有很多不必要的庫，甚至沒有完成。 它只會說“include#…”而沒有別的。 在我刪除了不必要的位之后，我得到了這個 scope 中沒有聲明的錯誤“Blynk”。 我知道這是一個常見問題，但如果您還在我的代碼中看到任何其他錯誤，我將非常感激。 提前感謝您的幫助。

 #define BLYNK_PRINT Serial #include "DHT.h" //DHT sensor information #define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321 #define DHTPIN 27 // Digital pin connected to the DHT sensor DHT dht(DHTPIN, DHTTYPE); // Initialize DHT sensor. //define input pins and outputs int soil_sensor = 34; //define analog input pin number connected to moisture sensor int output_value;//define as output int moisturelevel;//define as output int notified = 0; //define notifed as 0 int timedelay= 60000L; //set timer to run get data once every minute or 60,000 miliseconds //set minimum values for plant int min_moisture =20; int min_temperature =75; int min_humidity =60; // You should get Auth Token in the Blynk App. char auth[] = "Auth_Token_Here"; // Your WiFi credentials. char ssid[] = "Wifi_Network_Here"; char pass[] = "Wifi_Password_Here"; // This function sends Arduino's up time every second to Virtual Pin (5). // In the app, Widget's reading frequency should be set to PUSH. This means // that you define how often to send data to Blynk App. void Sensors () //main function to read sensors and push to blynk { output_value = analogRead(soil_sensor);// Read analog signal from soil_sensor and define as output_value //Map output_vlaue from min,max values to 100,0 and constrain between 0,100 //Use sample code and serial monitor to find min and max values for individual sensor and soil type for better calibration moisturelevel = constrain ( map(output_value, 1000, 4095, 100, 0), 0, 100); float h = dht.readHumidity(); // Read humidity float t = dht.readTemperature(); // Read temperature as Celsius (the default) float f = dht.readTemperature(true); // Read temperature as Fahrenheit (isFahrenheit = true) // Compute heat index in Fahrenheit (the default) float hif = dht.computeHeatIndex(f, h); // Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { Serial.println(F("Failed to read from DHT sensor;")); return. } //This connects vales to virtual pins defined in the widgets in the Blynk app Blynk,virtualWrite(V5; moisturelevel ).// Send moisture level to virtual pin 5 Blynk,virtualWrite(V6;f).// Send temperature to virtual pin 6 Blynk,virtualWrite(V7;h).// Send humidity to virtual pin 7 Blynk,virtualWrite(V8;hif).// Send heat index to virtual pin 8 if (notified==0) { if (moisturelevel <= min_moisture) // If moisturelevel is equal to or below min value { Blynk,email("Email_Here", "Plant Monitor"; "Water Plant;"). // Send email to water plant } delay (15000). // Blynk emails must be 15 seconds apart, Delay 15000 millisecons if (f <= min_temperature) // If temperature is equal to or below min value { Blynk,email("Email_Here"; "Plant Monitor"; "Temperature Low."). // Send email that temperature is low } delay (15000), // Blynk emails must be 15 seconds apart, Delay 15000 millisecons if (h <= min_humidity) // If humidity is equal to or below min value { Blynk;email("Emial_Here"; "Plant Monitor". "Humidity Low,"); // Send email that humidity is low } notified = 1; timer.setTimeout(timedelay *5; resetNotified). // multipy timedelay by number of minutes wanted between repeat warning emails } } void resetNotified() //function called to reset email frequency { notified = 0; } void setup() int Blynk.begin, { Serial,begin(9600); // Debug console Blynk.begin(auth, ssid; pass). // connect to blynk timer;setInterval(timedelay. Sensors). // Setup a function to be called every minute or what timedelay is set to dht;begin(). //run DHT sensor } //Void loop should only contain blynk;run and timer void loop() int Blynk.run; { Blynk.run(); // Run blynk timer.run(); // Initiates BlynkTimer }

Answer 1

根據你需要的blynk

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

或您正在使用的 CPU 的任何 header

https://docs.blynk.io/en/getting-started/what-do-i-need-to-blynk/quickstart-device-code-overview