Hello there i have written code to notify me when temp goes down using wemos and dht22.
the code does not want to compile for some reason. other code compile and upload fine. i have changed cables. please help
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
#include <DHT.h>
DHT dht(12, DHT22);
char auth[] = ""; // Put your Auth Token here. (see Step 3 above)
bool temperatureMoved = true; // means it moved below 20C
SimpleTimer timer;
void setup()
{
Serial.begin(9600); // See the connection status in Serial Monitor
Blynk.begin(auth, "", ""); //insert here your SSID and password
pinMode(5, OUTPUT);
// Setup a function to be called every second
timer.setInterval(10000L, sendUptime);
}
void sendUptime()
{
// You can send any value at any time.
// Please don't send more that 10 values per second.
//Read the Temp and Humidity from DHT
float h = dht.readHumidity();
float t = dht.readTemperature();
Blynk.virtualWrite(10, t); // virtual pin
Blynk.virtualWrite(11, h); // virtual pin
if ((t < 20) && (temperatureMoved == true)) {
temperatureMoved = false;
Blynk.notify(String("Frost im Gartenhaus : ") + t + String("°C"));
digitalWrite(5, 1);
}
if ((t >= 20) && (temperatureMoved == false)) {
temperatureMoved = true;
digitalWrite(5, 0);
}
}
void loop()
{
Blynk.run();
timer.run();
}
it gives error compiling for board wemos d1 r2 and mini.
kindly let me know how did you figure out that problem i was struggling with it for few hours and since i didnt get anywhere i thought i post for help. what do i need to do with dht.h library?
in the arduino i have it only tells me error compiling for board wemos d1 r2 and mini. exit status 1 and error compiling for board wemos d1 r2 and mini.
if you can point exactly where it would show me error is related to dht.h library i wont ask dumb question like this these in future…
Build options changed, rebuilding all
In file included from C:\Users\Home\Documents\Arduino\libraries\DHT-sensor-library-master\DHT_U.cpp:22:0:
C:\Users\Home\Documents\Arduino\libraries\DHT-sensor-library-master\DHT_U.h:25:29: fatal error: Adafruit_Sensor.h: No such file or directory
#include <Adafruit_Sensor.h>
^
compilation terminated.
exit status 1
Error compiling for board WeMos D1 R2 & mini.
Well based on your prior answer I thought you were doing both… but as I didn’t read all of your screenshot, and my mind reading widget is broke again… I was unsure But I stand corrected
ok so here is the updated code after i was able to compile and upload after getting help from Gunner and Dave1829. I have added a slider widget so i can set a range for input but it does not seem to work. may you good folks can have a quick look at it and let me know if it make sense!?
also i have added the code of arduino OTA…can you also have a look at it and let me know if there are ways i can streamline this code to make it more efficient.
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <WiFiUdp.h>
#include <ArduinoOTA.h>
#define BLYNK_PRINT Serial
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#define DHTPIN 12 //D6 wemos pin for sensor
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
const char* ssid = ""; //wifi name for OTA sketch
const char* password = ""; // wifi password for OTA sketch
char auth[] = ""; // hard auth code for blynk app
bool temperatureMoved = true;
SimpleTimer timer;
int maxvalue = 0;
void setup() {
Serial.begin(115200);
Serial.println("Booting");
WiFi.mode(WIFI_STA);
timer.setInterval(1000L, sendUptime);
WiFi.begin(ssid, password);
Blynk.begin(auth, ssid, password);
while (WiFi.waitForConnectResult() != WL_CONNECTED) {
Serial.println("Connection Failed! Rebooting...");
delay(5000);
ESP.restart();
}
ArduinoOTA.onStart([]() {
String type;
if (ArduinoOTA.getCommand() == U_FLASH)
type = "sketch";
else // U_SPIFFS
type = "filesystem";
// NOTE: if updating SPIFFS this would be the place to unmount SPIFFS using SPIFFS.end()
Serial.println("Start updating " + type);
});
ArduinoOTA.onEnd([]() {
Serial.println("\nEnd");
});
ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
});
ArduinoOTA.onError([](ota_error_t error) {
Serial.printf("Error[%u]: ", error);
if (error == OTA_AUTH_ERROR) Serial.println("Auth Failed");
else if (error == OTA_BEGIN_ERROR) Serial.println("Begin Failed");
else if (error == OTA_CONNECT_ERROR) Serial.println("Connect Failed");
else if (error == OTA_RECEIVE_ERROR) Serial.println("Receive Failed");
else if (error == OTA_END_ERROR) Serial.println("End Failed");
});
ArduinoOTA.begin();
Serial.println("Ready");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
}
BLYNK_WRITE(V0) //for slider
{
maxvalue == param.asInt();
}
void sendUptime()
{
float t = dht.readTemperature();
Blynk.virtualWrite(10, t); // virtual pin
if ((t < maxvalue) && (temperatureMoved == true)) {
temperatureMoved = false;
Blynk.notify(String("Temperature Low ") + t + String("°C"));
Blynk.email("XXXXX@gmail.com", "PIPE TEMP LOW", "Pipe Temperature LOW Warning");
}
if ((t >= maxvalue) && (temperatureMoved == false)) {
temperatureMoved = true;
Blynk.notify(String("Temperature is Normal ") + t + String("°C"));
}
}
void loop() {
ArduinoOTA.handle();
Blynk.run();
timer.run();
}
but thank you for the assist 
But I stand corrected 