ESP32 with DHT11 sensor and PWM-signal to caged fan

[FrederikSoelver]

Hi friends,

I have tried to write a project where I'm using an ESP32, a DHT11 and a 4 wire PWM caged fan.
I'm trying to log the data from the DHT11 on my blynk-app and send PWM signals to my caged fan at the same time.

the first code I have is the basic Blynk example:

Code: [Select all] [Expand/Collapse]

1. #define BLYNK_PRINT Serial
2.  
3.  
4. #include <WiFi.h>
5. #include <WiFiClient.h>
6. #include <BlynkSimpleEsp32.h>
7. #include <DHT.h>
8.  
9. // You should get Auth Token in the Blynk App.
10. // Go to the Project Settings (nut icon).
11. char auth[] = "YyxSI-rgdqf_ozwx3BmIZkkMFU3cuppC";
12.  
13. // Your WiFi credentials.
14. // Set password to "" for open networks.
15. char ssid[] = "nabofarm";
16. char pass[] = "regnbuer";
17.  
18. #define DHTPIN 4        // What digital pin we're connected to
19.  
20. // Uncomment whatever type you're using!
21. #define DHTTYPE DHT11     // DHT 11
22. //#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
23. //#define DHTTYPE DHT21   // DHT 21, AM2301
24.  
25. DHT dht(DHTPIN, DHTTYPE);
26. BlynkTimer timer;
27.  
28. // This function sends Arduino's up time every second to Virtual Pin (5).
29. // In the app, Widget's reading frequency should be set to PUSH. This means
30. // that you define how often to send data to Blynk App.
31. void sendSensor()
32. {
33.   float h = dht.readHumidity();
34.   float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
35.  
36.   if (isnan(h) || isnan(t)) {
37.     Serial.println("Failed to read from DHT sensor!");
38.     return;
39.   }
40.   // You can send any value at any time.
41.   // Please don't send more that 10 values per second.
42.   Blynk.virtualWrite(V5, h);
43.   Blynk.virtualWrite(V6, t);
44. }
45.  
46. void setup()
47. {
48.   // Debug console
49.   Serial.begin(9600);
50.  
51.   Blynk.begin(auth, ssid, pass);
52.   // You can also specify server:
53.   //Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 80);
54.   //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);
55.  
56.   dht.begin();
57.  
58.   // Setup a function to be called every second
59.   timer.setInterval(1000L, sendSensor);
60. }
61.  
62. void loop()
63. {
64.   Blynk.run();
65.   timer.run();
66. }

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the new one is one I did with a mix of the example and another one where I should be able to send out PWM signal to pin 16.

The example is running fine but when I upload the new one it's only online on the blink app for a short period. Does anyone know what's wrong?

Code: [Select all] [Expand/Collapse]

1. /*  App project setup:
2.     Value Display widget attached to V5
3.     Value Display widget attached to V6
4.  *************************************************************/
5.  
6. /* Comment this out to disable prints and save space */
7. #define BLYNK_PRINT Serial
8.  
9.  
10. #include <WiFi.h>
11. #include <WiFiClient.h>
12. #include <BlynkSimpleEsp32.h>
13. #include <DHT.h>
14.  
15. // You should get Auth Token in the Blynk App.
16. // Go to the Project Settings (nut icon).
17. char auth[] = "YyxSI-rgdqf_ozwx3BmIZkkMFU3cuppC";
18.  
19. // Your WiFi credentials.
20. // Set password to "" for open networks.
21. char ssid[] = "nabofarm";
22. char pass[] = "regnbuer";
23.  
24. #define DHTPIN 4        // What digital pin we're connected to
25.  
26. // Uncomment whatever type you're using!
27. #define DHTTYPE DHT11     // DHT 11
28. //#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
29. //#define DHTTYPE DHT21   // DHT 21, AM2301
30.  
31. DHT dht(DHTPIN, DHTTYPE);
32. BlynkTimer timer;
33.  
34. // This function sends Arduino's up time every second to Virtual Pin (5).
35. // In the app, Widget's reading frequency should be set to PUSH. This means
36. // that you define how often to send data to Blynk App.
37. void sendSensor()
38. {
39.   float h = dht.readHumidity();
40.   float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
41.  
42.   if (isnan(h) || isnan(t)) {
43.     Serial.println("Failed to read from DHT sensor!");
44.     return;
45.   }
46.   // You can send any value at any time.
47.   // Please don't send more that 10 values per second.
48.   Blynk.virtualWrite(V5, h);
49.   Blynk.virtualWrite(V6, t);
50.  
51.  
52.  
53.  
54.  
55.  
56.  
57.  
58.  
59. const int ledpin = 16;
60.  
61. const int freq= 20000;
62.  
63. const int channel= 0;
64.  
65. const int resolution= 8;
66.  
67.  
68.  
69.  
70.  
71.  
72.  
73.  
74.  
75.  
76.  
77.  
78.  
79.  
80. }
81.  
82. void setup()
83. {
84.  
85.  
86. ledcSetup (0, 20000, 8);
87.  
88. ledcAttachPin (16 , 0);
89.  
90.  
91.  
92.  
93.  
94.  
95.  
96.  
97.  
98.   // Debug console
99.   Serial.begin(9600);
100.  
101.   Blynk.begin(auth, ssid, pass);
102.   // You can also specify server:
103.   //Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 80);
104.   //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);
105.  
106.   dht.begin();
107.  
108.   // Setup a function to be called every second
109.   timer.setInterval(1000L, sendSensor);
110. }
111.  
112. void loop()
113. {
114.  
115.  
116.  
117. if (dht.readHumidity() < 60)
118.   // increase the LED brightness
119.   {for(int dutyCycle = 0; dutyCycle = 0; ){  
120.     // changing the LED brightness with PWM
121.     ledcWrite(0, dutyCycle);}
122.   }
123.     else
124.    
125.   {
126.     for(int dutyCycle = 0; dutyCycle = 255; ){  
127.  
128.     // changing the LED brightness with PWM
129.     ledcWrite(0, dutyCycle);}
130.   }
131.  
132.  
133.  
134.   delay (1000);
135.  
136.  
137. {
138.   Blynk.run();
139.   timer.run();
140. }
141.  
142. }

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