DS18B20 Temperature Sensor with ESP32: Wiring & Basic Code Tutorial — Transcript

Full transcript

1. 0:00[Music]
2. 0:08hi guys welcome to Robo craze today we
3. 0:13are going to be talking about the ds1 8b
4. 0:16to zero temperature sensor and how to
5. 0:18integrate it using an ESP 32 this is the
6. 0:23data sheet for the ds1 8b to 0
7. 0:26temperature sensor it is made by Dallas
8. 0:29semiconductor and here you can find the
9. 0:31pin assignment and the unique features
10. 0:33that this temperature sensor offers as
11. 0:36you can see it is a digital thermometer
12. 0:39which provides 9 to 12 bit temperature
13. 0:42readings also it can be interfaced using
14. 0:45only a single wire this means that the
15. 0:49power for reading writing and performing
16. 0:52temperature conversions
17. 0:53can be derived from the data line itself
18. 0:55without the need for an external power
19. 0:57source as part of this blog we will also
20. 1:00be learning about things peak which is
21. 1:02an IOT platform service that allows you
22. 1:05to analyze live data streams on the
23. 1:08cloud we start off by signing up for a
24. 1:12things peak account fill in your email
25. 1:14address and fill in the other details
26. 1:16that have been asked once you press
27. 1:22continue a verification mail will be
28. 1:26sent to your registered email ID
29. 1:29[Music]
30. 1:50[Music]
31. 1:55open the email thread sent by things
32. 1:58peek and in the bottom you can see that
33. 2:00they're asking you to log in to your
34. 2:02things speak account using the email
35. 2:05address associated with your MathWorks
36. 2:07account if you don't have a Matt works
37. 2:10account don't worry we'll cover that
38. 2:13also as part of the tutorial head over
39. 2:16to iNDOT MathWorks calm and click on
40. 2:19sign in at this stage if you don't have
41. 2:23a MathWorks account it is necessary to
42. 2:25create one simply fill in the required
43. 2:29details and you're good to go make sure
44. 2:35that you're giving the same email
45. 2:37address for both the things speak
46. 2:39account and the MathWorks account
47. 2:40otherwise the two will not be linked
48. 2:43together
49. 2:45log in to your mathworks account and in
50. 2:48a different tab log in to your things
51. 2:50peak account
52. 2:54[Music]
53. 3:04at the home screen click on new channel
54. 3:07for our application a channel is nothing
55. 3:12but a place where all the temperature
56. 3:14values from the sensor will be stored on
57. 3:17the cloud fill in the name of the
58. 3:20channel according to your need and the
59. 3:23description for our application we are
60. 3:27going to be monitoring temperature so
61. 3:29our field one will be renamed to
62. 3:31temperature hit on save channel at the
63. 3:35bottom of the page and in the home page
64. 3:38you can see that a new channel has been
65. 3:39created next we are going to be looking
66. 3:43at the hardware connections between the
67. 3:45ds1 8b to 0 temperature sensor and an
68. 3:49ESP 32 this is the temperature sensor
69. 3:53probe and at the other end of it you
70. 3:56have three wires coming out of the
71. 3:58sensor red is VCC black is ground and
72. 4:05yellow is signal we are also using a 10k
73. 4:09resistor for this application connect
74. 4:13the signal line at one end of the
75. 4:15resistor
76. 4:16[Music]
77. 4:20VCC for the sensor is rated at 3.3 volts
78. 4:24and connect ground on a different rail
79. 4:28of the breadboard
80. 4:30[Music]
81. 4:35from the ESP 30 to development module we
82. 4:38are using three pins ground GPIO 23 and
83. 4:433.3 volts Connect 3.3 volts to the VCC
84. 4:48of the sensor connect common ground and
85. 4:56GPIO 23 to the other end of the resistor
86. 4:59which is connected to the signal pin of
87. 5:01the sensor the other end of the resistor
88. 5:07needs to be pulled up high to 5 volts
89. 5:10and for this we are using an Arduino
90. 5:15connect the 5 volt pin to the other end
91. 5:18of the resistor and common ground the
92. 5:20circuit
93. 5:21[Music]
94. 5:25now we'll be looking at the cold part
95. 5:30[Music]
96. 5:36in the code we are first including all
97. 5:39the header files that we require at the
98. 5:42top
99. 5:44[Music]
100. 5:47we are also defining the SSID and
101. 5:51password of our Wi-Fi network and the
102. 5:54pin 23 which is connected to the signal
103. 5:57pin of the sensor the channel ID and
104. 6:03right API key are two other parameters
105. 6:06which are important in this application
106. 6:09we will discuss where to find these two
107. 6:12parameters in the later section the
108. 6:15setup function is pretty straightforward
109. 6:17in which we initialize a serial
110. 6:20connection between our laptop and the
111. 6:23ESP board we also start Wi-Fi on the ESP
112. 6:29board and initialized the thin speak
113. 6:31section in the loop function we try to
114. 6:35connect the ESP board to our Wi-Fi
115. 6:38network using the SSID and password
116. 6:40credentials provided we also try to
117. 6:45receive the temperature sensor values
118. 6:48continuously and publish them to think
119. 6:51speak at an interval of two seconds now
120. 6:53let's go ahead and approve the program
121. 6:56into the ESP
122. 6:57[Music]
123. 7:09[Music]
124. 7:13to find the channel ID and write API
125. 7:16keys click on the channel that you
126. 7:19recently created on top you can find the
127. 7:22channel ID and in the API key section
128. 7:25you can find the right API key
129. 7:35as you can see I am continuously writing
130. 7:38the temperature sensor value on the
131. 7:42serial monitor and every time I press
132. 7:45hard on the sensor the temperature gets
133. 7:47warmer and the sensor readings go up if
134. 8:01you open the graph on the things peak
135. 8:03channel that you have created you can
136. 8:05see that the temperature gets updated
137. 8:08there periodically in this example we
138. 8:11are dipping the temperature sensor probe
139. 8:13into hot water and you can see the jump
140. 8:16in temperature readings
141. 8:21[Music]
142. 8:27in this tutorial we will also be
143. 8:30learning about pocket IOD which is an
144. 8:33android application with the help of
145. 8:36pocket iot we can remotely monitor the
146. 8:40temperature readings have been stored in
147. 8:43cloud it's installation is pretty
148. 8:47straightforward head over to Play Store
149. 8:49and install the pocket IOT app once
150. 8:53installed enter the channel credentials
151. 8:56and you're done
152. 8:59well guys that was all about the ds1 8b
153. 9:032:01 by a temperature sensor and
154. 9:07uploading its temperature readings to
155. 9:10the cloud using things peak we also saw
156. 9:14how using an android phone we can
157. 9:18monitor these temperature readings using
158. 9:20the pocket iot app for further
159. 9:24documentation please visit our blog link
160. 9:27is in the description thank you for
161. 9:29watching and stay tuned
162. 9:40[Music]