从 bool 获取值时未在此范围内声明 Temp
Temp was not declared in this scope when getting values from bool
您好，我想将一些空值更改为布尔值，但我有点迷茫。我知道如果你写一个 void 或 bool 并想将值添加到下一个 void 你只需插入代码以添加前一个函数
我不知道怎么解释，我只想告诉你我想做什么：
创建了一个新的 bool getValues 并添加了所有从传感器获取代码的值，然后我想将数据发送到 void 循环，该循环将通过 mqqt 将数据发送到树莓派。
我知道 bool 代表 true 和 false。但是我不太明白使用它的礼节
所以我在 void 循环函数 'temp' was not declared in this scope 遇到的问题
我用 // 突出显示了这个函数，我得到的错误几乎在底部
#include "DHT.h"
#include <WiFi.h>
#define DHTPIN 25 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11 // DHT 11
//MQTT Setup Start
#include <PubSubClient.h>
#define mqtt_server "192.168.1.210"
WiFiClient espClient;
PubSubClient client(espClient);
#define mqttlightReadingpercent "greenHouse/light"
#define mqttsoilmoisturepercent "greenHouse/soil"
#define mqtttemp "greenHouse/temp"
#define mqtthum "greenHouse/hum"
//MQTT Setup End
const char* ssid = "Cgates_E031F1"; // ESP32 and ESP8266 uses 2.4GHZ wifi only
const char* password = "60E541C32F";
DHT dht(DHTPIN, DHTTYPE);
const byte lightPin = 33;
int lightReading;
int lightReadingpercent=0;
//const int RELAY_PIN = 15; // the Arduino pin, which connects to the IN pin of relay
// soil moisture
const int AirValue = 4095; //you need to replace this value with Value_1
const int WaterValue = 2200; //you need to replace this value with Value_2
const int SensorPin = 32;
int soilMoistureValue = 0;
int soilmoisturepercent=0;
const int Lightvalue = 0;
const int Darkvalue = 4095;
unsigned long millisNow = 0; //for delay purposes
unsigned int sendDelay = 20000; //delay before sending sensor info via MQTT
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
Serial.println();
// begin Wifi connect
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(2000);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
//end Wifi connect
client.setServer(mqtt_server, 1883);
// pinMode(RELAY_PIN, OUTPUT);//relay
pinMode(lightPin, INPUT);
pinMode(SensorPin, INPUT);
Serial.println(F("DHTxx test!")); //dht
;
dht.begin();
}
void reconnect() {
// Loop until we're reconnected
int counter = 0;
while (!client.connected()) {
if (counter == 5) {
ESP.restart();
}
counter+=1;
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("greenHouseController")) {
Serial.println("connected");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
bool getValues() {
lightReading = analogRead(lightPin); //0-4095 12bit -- esp8266 10bit 0-1023 -- arduino 8bit 0-254
Serial.print("Light reading = ");
lightReadingpercent = map(lightReading, Darkvalue, Lightvalue, 0, 100 );
Serial.print(lightReadingpercent);
Serial.println(" %");
Serial.println();
soilMoistureValue = analogRead(SensorPin); //put Sensor insert into soil
soilmoisturepercent = map(soilMoistureValue, AirValue, WaterValue, 0, 100);
if (soilmoisturepercent > 100) {
Serial.println("Soil moisture ");
Serial.println("100 %");
delay(500);
}
else if(soilmoisturepercent <0) {
Serial.println("Soil moisture ");
Serial.println("0 %");
delay(500);
}
else if (soilmoisturepercent >=0 && soilmoisturepercent <= 100) {
Serial.println("Soil moisture "); //go to next line
Serial.print(soilmoisturepercent);
Serial.println("%");
delay(500); // soil end
}
delay(500);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float hum = dht.readHumidity();
// Read temperature as Celsius (the default)
float temp = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(hum) || isnan(temp) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return 1;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, hum);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(temp, hum, false);
Serial.print(F(" Humidity: "));
Serial.print(hum);
Serial.print(F("% Temperature: "));
Serial.print(temp);
Serial.print(F("C "));
Serial.print(f);
Serial.print(F("F Heat index: "));
Serial.print(hic);
Serial.print(F("C "));
Serial.print(hif);
Serial.println(F("F"));
delay(500); //wait 0.5seconds
}
void loop() {
if (!client.connected()) {
reconnect();
}
if (millis() > millisNow + sendDelay) {
if (getValues()) {
client.publish(mqttlightReadingpercent, String(lightReadingpercent).c_str(),true);
client.publish(mqttsoilmoisturepercent, String(soilmoisturepercent).c_str(),true);
client.publish(mqtttemp, String(temp).c_str(),true); // the problem is here
client.publish(mqtthum, String(hum).c_str(),true);
millisNow = millis();
}
}
client.loop();
/*if (moisture_level < 10) {
digitalWrite(RELAY_PIN, HIGH); // turn on pump 5 seconds
delay(5000);
}
else {
digitalWrite(RELAY_PIN, LOW); // turn off pump 5 seconds
delay(5000);
}*/
}
通过将您的代码移动到 getValues，您还更改了 temp 变量所在的范围。变量不会自动全局可用。如果你在一个函数中声明一个变量（getValues 是），它只在这个函数中可用。
当您尝试在 loop 函数中访问 temp 变量时，编译器正确地告诉您，没有这样的变量可用。
您可以通过将 temp 声明为全局变量来解决问题，您可以通过在顶部添加 float temp = 0 来实现，您还可以在其中声明 soilMoistureValue 等变量。确保不要在 getValues 中重新声明变量，所以不要像 float temp = dht.readTemperature(); 那样声明，而是像 temp = dht.readTemperature();
那样分配一个新值
关于你的第一段的快速说明：voids 和 bools 你如何称呼它，定义函数的 return 类型。如果你的函数没有 return 任何东西，你就把它定义为 void。如果它 return 是一个布尔值（真或假），你定义为布尔值。对于 getValues 函数，因为它没有 return 任何东西，所以它应该是 void getValues.
您好，我想将一些空值更改为布尔值，但我有点迷茫。我知道如果你写一个 void 或 bool 并想将值添加到下一个 void 你只需插入代码以添加前一个函数
我不知道怎么解释，我只想告诉你我想做什么：
创建了一个新的 bool getValues 并添加了所有从传感器获取代码的值，然后我想将数据发送到 void 循环，该循环将通过 mqqt 将数据发送到树莓派。
我知道 bool 代表 true 和 false。但是我不太明白使用它的礼节
所以我在 void 循环函数 'temp' was not declared in this scope 遇到的问题
我用 // 突出显示了这个函数，我得到的错误几乎在底部
#include "DHT.h"
#include <WiFi.h>
#define DHTPIN 25 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11 // DHT 11
//MQTT Setup Start
#include <PubSubClient.h>
#define mqtt_server "192.168.1.210"
WiFiClient espClient;
PubSubClient client(espClient);
#define mqttlightReadingpercent "greenHouse/light"
#define mqttsoilmoisturepercent "greenHouse/soil"
#define mqtttemp "greenHouse/temp"
#define mqtthum "greenHouse/hum"
//MQTT Setup End
const char* ssid = "Cgates_E031F1"; // ESP32 and ESP8266 uses 2.4GHZ wifi only
const char* password = "60E541C32F";
DHT dht(DHTPIN, DHTTYPE);
const byte lightPin = 33;
int lightReading;
int lightReadingpercent=0;
//const int RELAY_PIN = 15; // the Arduino pin, which connects to the IN pin of relay
// soil moisture
const int AirValue = 4095; //you need to replace this value with Value_1
const int WaterValue = 2200; //you need to replace this value with Value_2
const int SensorPin = 32;
int soilMoistureValue = 0;
int soilmoisturepercent=0;
const int Lightvalue = 0;
const int Darkvalue = 4095;
unsigned long millisNow = 0; //for delay purposes
unsigned int sendDelay = 20000; //delay before sending sensor info via MQTT
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
Serial.println();
// begin Wifi connect
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(2000);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
//end Wifi connect
client.setServer(mqtt_server, 1883);
// pinMode(RELAY_PIN, OUTPUT);//relay
pinMode(lightPin, INPUT);
pinMode(SensorPin, INPUT);
Serial.println(F("DHTxx test!")); //dht
;
dht.begin();
}
void reconnect() {
// Loop until we're reconnected
int counter = 0;
while (!client.connected()) {
if (counter == 5) {
ESP.restart();
}
counter+=1;
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("greenHouseController")) {
Serial.println("connected");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
bool getValues() {
lightReading = analogRead(lightPin); //0-4095 12bit -- esp8266 10bit 0-1023 -- arduino 8bit 0-254
Serial.print("Light reading = ");
lightReadingpercent = map(lightReading, Darkvalue, Lightvalue, 0, 100 );
Serial.print(lightReadingpercent);
Serial.println(" %");
Serial.println();
soilMoistureValue = analogRead(SensorPin); //put Sensor insert into soil
soilmoisturepercent = map(soilMoistureValue, AirValue, WaterValue, 0, 100);
if (soilmoisturepercent > 100) {
Serial.println("Soil moisture ");
Serial.println("100 %");
delay(500);
}
else if(soilmoisturepercent <0) {
Serial.println("Soil moisture ");
Serial.println("0 %");
delay(500);
}
else if (soilmoisturepercent >=0 && soilmoisturepercent <= 100) {
Serial.println("Soil moisture "); //go to next line
Serial.print(soilmoisturepercent);
Serial.println("%");
delay(500); // soil end
}
delay(500);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float hum = dht.readHumidity();
// Read temperature as Celsius (the default)
float temp = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(hum) || isnan(temp) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return 1;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, hum);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(temp, hum, false);
Serial.print(F(" Humidity: "));
Serial.print(hum);
Serial.print(F("% Temperature: "));
Serial.print(temp);
Serial.print(F("C "));
Serial.print(f);
Serial.print(F("F Heat index: "));
Serial.print(hic);
Serial.print(F("C "));
Serial.print(hif);
Serial.println(F("F"));
delay(500); //wait 0.5seconds
}
void loop() {
if (!client.connected()) {
reconnect();
}
if (millis() > millisNow + sendDelay) {
if (getValues()) {
client.publish(mqttlightReadingpercent, String(lightReadingpercent).c_str(),true);
client.publish(mqttsoilmoisturepercent, String(soilmoisturepercent).c_str(),true);
client.publish(mqtttemp, String(temp).c_str(),true); // the problem is here
client.publish(mqtthum, String(hum).c_str(),true);
millisNow = millis();
}
}
client.loop();
/*if (moisture_level < 10) {
digitalWrite(RELAY_PIN, HIGH); // turn on pump 5 seconds
delay(5000);
}
else {
digitalWrite(RELAY_PIN, LOW); // turn off pump 5 seconds
delay(5000);
}*/
}
通过将您的代码移动到 getValues，您还更改了 temp 变量所在的范围。变量不会自动全局可用。如果你在一个函数中声明一个变量（getValues 是），它只在这个函数中可用。
当您尝试在 loop 函数中访问 temp 变量时，编译器正确地告诉您，没有这样的变量可用。
您可以通过将 temp 声明为全局变量来解决问题，您可以通过在顶部添加 float temp = 0 来实现，您还可以在其中声明 soilMoistureValue 等变量。确保不要在 getValues 中重新声明变量，所以不要像 float temp = dht.readTemperature(); 那样声明，而是像 temp = dht.readTemperature();
关于你的第一段的快速说明：voids 和 bools 你如何称呼它，定义函数的 return 类型。如果你的函数没有 return 任何东西，你就把它定义为 void。如果它 return 是一个布尔值（真或假），你定义为布尔值。对于 getValues 函数，因为它没有 return 任何东西，所以它应该是 void getValues.