esp[32 openweathermap – convert kelvin to Centigrade

Sara,

Issue resolved – thanks for your quick response.

Steve

Resolved by changing variable type of  temp from float to int – I also added a C to F conversion

Revised code:

int temp;
temp = (int)(myObject[“main”][“temp”]) – 273.15; // get temperature in °C
Serial.print(“Temperature C: “);
Serial.println(temp);
int tempf;
Serial.print(“Temperature F: “);
tempf = (temp *9/5 +32);
Serial.println(tempf);

Hi Sara,

on page 719 of “Learn ESP32 with arduino ide regarding the openweathermap code

I want to convert the degrees Kelvin to degrees C from the code on page 720 of  “Learn ESP32 with arduino ide.”

Your code is:
(line 67) Serial.println(myObject[“main”][“temp”]);

MY CODE (which I took from  your answer from 7 months ago when you answered Domenico Carvetta’s query):

follows
float temp = (float)(myobject[“main”][“temp”]) – 273.15; // get temperature in °C
Serial.print(“Temperature C: “);
Serial.println(temp);

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openweathermap

float temp = (float)(myobject[“main”][“temp”]) – 273.15; // get temperature in °C
Serial.print(“Temperature C: “);
Serial.println(temp);

Sara,
As far as I can tell, the only difference in code is that I use myobject rather than

//float temp = (float)(root[“main”][“temp”]) – 273.15; // get temperature in °C

ERROR LOG

Arduino: 1.8.14 Hourly Build 2020/10/09 12:33 (Windows 10), Board: “NodeMCU-32S, 80MHz, 921600”

Open_weather_map:70:28: error: ‘myobject’ was not declared in this scope
float temp = (float)(myobject[“main”][“temp”]) – 273.15; // get temperature in °C

^
exit status 1

‘myobject’ was not declared in this scope

without MY CODE serial print is:

12:03:16.121 -> HTTP Response code: 200
12:03:16.121 -> {“coord”:{“lon”:-96.7,”lat”:33.02},”weather”:[{“id”:804,”main”:”Clouds”,”description”:”overcast clouds”,”icon”:”04d”}],”base”:”stations”,”main”:{“temp”:277.35,”feels_like”:272.08,”temp_min”:276.48,”temp_max”:278.15,”pressure”:1020,”humidity”:97},”visibility”:10000,”wind”:{“speed”:5.58,”deg”:13},”clouds”:{“all”:100},”dt”:1603818038,”sys”:{“type”:3,”id”:2010018,”country”:”US”,”sunrise”:1603802459,”sunset”:1603842002},”timezone”:-18000,”id”:4719457,”name”:”Plano”,”cod”:200}
12:03:16.189 -> JSON object = {“coord”:{“lon”:-96.7,”lat”:33.02},”weather”:[{“id”:804,”main”:”Clouds”,”description”:”overcast clouds”,”icon”:”04d”}],”base”:”stations”,”main”:{“temp”:277.35,”feels_like”:272.08,”temp_min”:276.48,”temp_max”:278.15,”pressure”:1020,”humidity”:97},”visibility”:10000,”wind”:{“speed”:5.58,”deg”:13},”clouds”:{“all”:100},”dt”:1603818038,”sys”:{“type”:3,”id”:2010018,”country”:”US”,”sunrise”:1603802459,”sunset”:1603842002},”timezone”:-18000,”id”:4719457,”name”:”Plano”,”cod”:200}
12:03:16.223 -> Temperature: 277.35
12:03:16.223 -> Pressure: 1020
12:03:16.223 -> Humidity: 97
12:03:16.223 -> Wind Speed: 5.58
12:03:26.783 -> HTTP Response code: 200
12:03:26.783 -> {“coord”:{“lon”:-96.7,”lat”:33.02},”weather”:[{“id”:804,”main”:”Clouds”,”description”:”overcast clouds”,”icon”:”04d”}],”base”:”stations”,”main”:{“temp”:277.35,”feels_like”:272.08,”temp_min”:276.48,”temp_max”:278.15,”pressure”:1020,”humidity”:97},”visibility”:10000,”wind”:{“speed”:5.58,”deg”:13},”clouds”:{“all”:100},”dt”:1603818038,”sys”:{“type”:3,”id”:2010018,”country”:”US”,”sunrise”:1603802459,”sunset”:1603842002},”timezone”:-18000,”id”:4719457,”name”:”Plano”,”cod”:200}
12:03:26.820 -> JSON object = {“coord”:{“lon”:-96.7,”lat”:33.02},”weather”:[{“id”:804,”main”:”Clouds”,”description”:”overcast clouds”,”icon”:”04d”}],”base”:”stations”,”main”:{“temp”:277.35,”feels_like”:272.08,”temp_min”:276.48,”temp_max”:278.15,”pressure”:1020,”humidity”:97},”visibility”:10000,”wind”:{“speed”:5.58,”deg”:13},”clouds”:{“all”:100},”dt”:1603818038,”sys”:{“type”:3,”id”:2010018,”country”:”US”,”sunrise”:1603802459,”sunset”:1603842002},”timezone”:-18000,”id”:4719457,”name”:”Plano”,”cod”:200}
12:03:26.853 -> Temperature: 277.35
12:03:26.853 -> Pressure: 1020
12:03:26.887 -> Humidity: 97
12:03:26.887 -> Wind Speed: 5.58
12:03:37.453 -> HTTP Response code: 200
12:03:37.453 -> {“coord”:{“lon”:-96.7,”lat”:33.02},”weather”:[{“id”:804,”main”:”Clouds”,”description”:”overcast clouds”,”icon”:”04d”}],”base”:”stations”,”main”:{“temp”:277.35,”feels_like”:272.08,”temp_min”:276.48,”temp_max”:278.15,”pressure”:1020,”humidity”:97},”visibility”:10000,”wind”:{“speed”:5.58,”deg”:13},”clouds”:{“all”:100},”dt”:1603818038,”sys”:{“type”:3,”id”:2010018,”country”:”US”,”sunrise”:1603802459,”sunset”:1603842002},”timezone”:-18000,”id”:4719457,”name”:”Plano”,”cod”:200}
12:03:37.487 -> JSON object = {“coord”:{“lon”:-96.7,”lat”:33.02},”weather”:[{“id”:804,”main”:”Clouds”,”description”:”overcast clouds”,”icon”:”04d”}],”base”:”stations”,”main”:{“temp”:277.35,”feels_like”:272.08,”temp_min”:276.48,”temp_max”:278.15,”pressure”:1020,”humidity”:97},”visibility”:10000,”wind”:{“speed”:5.58,”deg”:13},”clouds”:{“all”:100},”dt”:1603818038,”sys”:{“type”:3,”id”:2010018,”country”:”US”,”sunrise”:1603802459,”sunset”:1603842002},”timezone”:-18000,”id”:4719457,”name”:”Plano”,”cod”:200}
12:03:37.523 -> Temperature: 277.35
12:03:37.523 -> Pressure: 1020
12:03:37.523 -> Humidity: 97
12:03:37.523 -> Wind Speed: 5.58

As always, thanks very much,
Steve Fisch