DHT22 and 4-digit 7-segment display

1/* Using the DHT22 sensor to take temperature
2   and humidity readings,  then display it on the
3   4 digit 7 segment display.
4
5   Components:
6                - Arduino Uno
7                - DHT22
8                - 4  digit 7 segment display
9                - 1kOhm resistor (x 4)
10                -  10kOhm resistor (act as a Pull-up resistor)
11
12   Libraries:
13                -  DHT.h
14                - Github repository: https://github.com/adafruit/DHT-sensor-library
15
16   Datasheet: https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf
17
18   Created on 9 June 2022 by c010rblind3ngineer
19*/
20
21
22#include "DHT.h"
23#define  DHTPIN 13
24#define DHTTYPE DHT22
25DHT dht(DHTPIN, DHTTYPE);   //Initialize DHT  sensor
26
27int pinA = 11;
28int pinB = 7;
29int pinC = 4;
30int pinD = 2;
31int  pinE = 1;
32int pinF = 10;
33int pinG = 5;
34int pinDP = 3;
35
36int D1 = 12;
37int  D2 = 9;
38int D3 = 8;
39int D4 = 6;
40
41
42void setup() {
43  // put your  setup code here, to run once:
44  pinMode(pinA, OUTPUT);  //11
45  pinMode(pinB,  OUTPUT);  //7
46  pinMode(pinC, OUTPUT);  //4
47  pinMode(pinD, OUTPUT);  //2
48  pinMode(pinE, OUTPUT);  //1
49  pinMode(pinF, OUTPUT);  //10
50  pinMode(pinG,  OUTPUT);  //5
51  pinMode(D1, OUTPUT);    //12
52  pinMode(D2, OUTPUT);    //9
53  pinMode(D3, OUTPUT);    //8
54  pinMode(D4, OUTPUT);    //6
55
56  dht.begin();
57}
58
59void  loop() {
60  // Give time for the sensor between measurements
61  delay(2000);
62
63  // Read temperature in Celsius
64  float tC = dht.readTemperature(false);
65  // Read humidity
66  float h = dht.readHumidity();
67
68  // Display temperature  digits on 4 digit 7 segment display
69  int tempd1 = int(tC / 10);
70  int tempd2  = int((int)tC % 10);
71  // Display humidity digits on 4 digit 7 segment display
72  int h1 = int(h / 10);
73  int h2 = int((int)h % 10);
74
75  // 'for' loop ensures  the display is constantly ON within a period of time (approx. 10s)...
76  // ...before  sensor takes another reading.
77  // Temperature reading
78  for (int i = 0; i  < 2000; i++) {
79    digitalWrite(D1, LOW);
80    digitalWrite(D2, HIGH);
81    digitalWrite(D3, HIGH);
82    digitalWrite(D4, HIGH);
83    disp(tempd1);
84    delay(1);
85
86    digitalWrite(D1, HIGH);
87    digitalWrite(D2, LOW);
88    digitalWrite(D3, HIGH);
89    digitalWrite(D4, HIGH);
90    disp(tempd2);
91    delay(1);
92
93    digitalWrite(D1, HIGH);
94    digitalWrite(D2, HIGH);
95    digitalWrite(D3, LOW);
96    digitalWrite(D4, HIGH);
97    disp(11);
98    delay(1);
99
100    digitalWrite(D1, HIGH);
101    digitalWrite(D2, HIGH);
102    digitalWrite(D3,  HIGH);
103    digitalWrite(D4, LOW);
104    disp(10);
105    delay(1);
106  }
107  displayoff();
108  delay(1000);
109
110  // Humidity reading
111  for (int i =  0; i < 2000; i++) {
112    digitalWrite(D1, LOW);
113    digitalWrite(D2, HIGH);
114    digitalWrite(D3, HIGH);
115    digitalWrite(D4, HIGH);
116    disp(h1);
117    delay(1);
118
119    digitalWrite(D1, HIGH);
120    digitalWrite(D2, LOW);
121    digitalWrite(D3, HIGH);
122    digitalWrite(D4, HIGH);
123    disp(h2);
124    delay(1);
125
126    digitalWrite(D1, HIGH);
127    digitalWrite(D2, HIGH);
128    digitalWrite(D3, LOW);
129    digitalWrite(D4, HIGH);
130    disp(12);
131    delay(1);
132
133    digitalWrite(D1, HIGH);
134    digitalWrite(D2, HIGH);
135    digitalWrite(D3,  HIGH);
136    digitalWrite(D4, LOW);
137    disp(13);
138    delay(1);
139  }
140  displayoff();
141
142}
143
144void disp(int number) {
145
146  switch (number)  {
147    case 0 : // display '0' on 7 segment
148      digitalWrite(pinA, HIGH);
149      digitalWrite(pinB, HIGH);
150      digitalWrite(pinC, HIGH);
151      digitalWrite(pinD,  HIGH);
152      digitalWrite(pinE, HIGH);
153      digitalWrite(pinF, HIGH);
154      digitalWrite(pinG, LOW);
155      break;
156
157    case 1 : // display '1'  on 7 segment
158      digitalWrite(pinA, LOW);
159      digitalWrite(pinB, HIGH);
160      digitalWrite(pinC, HIGH);
161      digitalWrite(pinD, LOW);
162      digitalWrite(pinE,  LOW);
163      digitalWrite(pinF, LOW);
164      digitalWrite(pinG, LOW);
165      break;
166
167    case 2 : // display '2' on 7 segment
168      digitalWrite(pinA, HIGH);
169      digitalWrite(pinB, HIGH);
170      digitalWrite(pinC, LOW);
171      digitalWrite(pinD,  HIGH);
172      digitalWrite(pinE, HIGH);
173      digitalWrite(pinF, LOW);
174      digitalWrite(pinG, HIGH);
175      break;
176
177    case 3 : // display '3'  on 7 segment
178      digitalWrite(pinA, HIGH);
179      digitalWrite(pinB, HIGH);
180      digitalWrite(pinC, HIGH);
181      digitalWrite(pinD, HIGH);
182      digitalWrite(pinE,  LOW);
183      digitalWrite(pinF, LOW);
184      digitalWrite(pinG, HIGH);
185      break;
186
187    case 4 : // display '4' on 7 segment
188      digitalWrite(pinA, LOW);
189      digitalWrite(pinB,  HIGH);
190      digitalWrite(pinC, HIGH);
191      digitalWrite(pinD, LOW);
192      digitalWrite(pinE, LOW);
193      digitalWrite(pinF, HIGH);
194      digitalWrite(pinG,  HIGH);
195      break;
196
197    case 5 : // display '5' on 7 segment
198      digitalWrite(pinA,  HIGH);
199      digitalWrite(pinB, LOW);
200      digitalWrite(pinC, HIGH);
201      digitalWrite(pinD, HIGH);
202      digitalWrite(pinE, LOW);
203      digitalWrite(pinF,  HIGH);
204      digitalWrite(pinG, HIGH);
205      break;
206
207    case 6 : //  display '6' on 7 segment
208      digitalWrite(pinA, HIGH);
209      digitalWrite(pinB,  LOW);
210      digitalWrite(pinC, HIGH);
211      digitalWrite(pinD, HIGH);
212      digitalWrite(pinE, HIGH);
213      digitalWrite(pinF, HIGH);
214      digitalWrite(pinG,  HIGH);
215      break;
216
217    case 7 : // display '7' on 7 segment
218      digitalWrite(pinA,  HIGH);
219      digitalWrite(pinB, HIGH);
220      digitalWrite(pinC, HIGH);
221      digitalWrite(pinD, LOW);
222      digitalWrite(pinE, LOW);
223      digitalWrite(pinF,  LOW);
224      digitalWrite(pinG, LOW);
225      break;
226
227    case 8 : // display  '8' on 7 segment
228      digitalWrite(pinA, HIGH);
229      digitalWrite(pinB,  HIGH);
230      digitalWrite(pinC, HIGH);
231      digitalWrite(pinD, HIGH);
232      digitalWrite(pinE, HIGH);
233      digitalWrite(pinF, HIGH);
234      digitalWrite(pinG,  HIGH);
235      break;
236
237    case 9 : // display '9' on 7 segment
238      digitalWrite(pinA,  HIGH);
239      digitalWrite(pinB, HIGH);
240      digitalWrite(pinC, HIGH);
241      digitalWrite(pinD, LOW);
242      digitalWrite(pinE, LOW);
243      digitalWrite(pinF,  HIGH);
244      digitalWrite(pinG, HIGH);
245      break;
246
247    case 10 :  //  display 'C' on 7 segment
248      digitalWrite(pinA, HIGH);
249      digitalWrite(pinB,  LOW);
250      digitalWrite(pinC, LOW);
251      digitalWrite(pinD, HIGH);
252      digitalWrite(pinE,  HIGH);
253      digitalWrite(pinF, HIGH);
254      digitalWrite(pinG, LOW);
255      break;
256
257    case 11 :  // display 'o' on 7 segment
258      digitalWrite(pinA,  HIGH);
259      digitalWrite(pinB, HIGH);
260      digitalWrite(pinC, LOW);
261      digitalWrite(pinD, LOW);
262      digitalWrite(pinE, LOW);
263      digitalWrite(pinF,  HIGH);
264      digitalWrite(pinG, HIGH);
265      break;
266
267    case 12 : //  display 'H' on 7 segment
268      digitalWrite(pinA, LOW);
269      digitalWrite(pinB,  HIGH);
270      digitalWrite(pinC, HIGH);
271      digitalWrite(pinD, LOW);
272      digitalWrite(pinE, HIGH);
273      digitalWrite(pinF, HIGH);
274      digitalWrite(pinG,  HIGH);
275      break;
276
277    case 13 : // display 'u' on 7 segment
278      digitalWrite(pinA,  LOW);
279      digitalWrite(pinB, LOW);
280      digitalWrite(pinC, HIGH);
281      digitalWrite(pinD,  HIGH);
282      digitalWrite(pinE, HIGH);
283      digitalWrite(pinF, LOW);
284      digitalWrite(pinG, LOW);
285      break;
286  }
287}
288
289void displayoff()  {
290  digitalWrite(D1, HIGH);
291  digitalWrite(D2, HIGH);
292  digitalWrite(D3,  HIGH);
293  digitalWrite(D4, HIGH);
294}
295

1/* Using the DHT22 sensor to take temperature
2   and humidity readings,   then display it on the
3   4 digit 7 segment display.
4
5   Components:
6                 - Arduino Uno
7                - DHT22
8                - 4   digit 7 segment display
9                - 1kOhm resistor (x 4)
10                -   10kOhm resistor (act as a Pull-up resistor)
11
12   Libraries:
13                -   DHT.h
14                - Github repository: https://github.com/adafruit/DHT-sensor-library
15
16    Datasheet: https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf
17
18    Created on 9 June 2022 by c010rblind3ngineer
19*/
20
21
22#include "DHT.h"
23#define   DHTPIN 13
24#define DHTTYPE DHT22
25DHT dht(DHTPIN, DHTTYPE);   //Initialize DHT   sensor
26
27int pinA = 11;
28int pinB = 7;
29int pinC = 4;
30int pinD = 2;
31int   pinE = 1;
32int pinF = 10;
33int pinG = 5;
34int pinDP = 3;
35
36int D1 = 12;
37int   D2 = 9;
38int D3 = 8;
39int D4 = 6;
40
41
42void setup() {
43  // put your   setup code here, to run once:
44  pinMode(pinA, OUTPUT);  //11
45  pinMode(pinB,   OUTPUT);  //7
46  pinMode(pinC, OUTPUT);  //4
47  pinMode(pinD, OUTPUT);  //2
48   pinMode(pinE, OUTPUT);  //1
49  pinMode(pinF, OUTPUT);  //10
50  pinMode(pinG,   OUTPUT);  //5
51  pinMode(D1, OUTPUT);    //12
52  pinMode(D2, OUTPUT);    //9
53   pinMode(D3, OUTPUT);    //8
54  pinMode(D4, OUTPUT);    //6
55
56  dht.begin();
57}
58
59void   loop() {
60  // Give time for the sensor between measurements
61  delay(2000);
62
63   // Read temperature in Celsius
64  float tC = dht.readTemperature(false);
65   // Read humidity
66  float h = dht.readHumidity();
67
68  // Display temperature   digits on 4 digit 7 segment display
69  int tempd1 = int(tC / 10);
70  int tempd2   = int((int)tC % 10);
71  // Display humidity digits on 4 digit 7 segment display
72   int h1 = int(h / 10);
73  int h2 = int((int)h % 10);
74
75  // 'for' loop ensures   the display is constantly ON within a period of time (approx. 10s)...
76  // ...before   sensor takes another reading.
77  // Temperature reading
78  for (int i = 0; i   < 2000; i++) {
79    digitalWrite(D1, LOW);
80    digitalWrite(D2, HIGH);
81     digitalWrite(D3, HIGH);
82    digitalWrite(D4, HIGH);
83    disp(tempd1);
84     delay(1);
85
86    digitalWrite(D1, HIGH);
87    digitalWrite(D2, LOW);
88     digitalWrite(D3, HIGH);
89    digitalWrite(D4, HIGH);
90    disp(tempd2);
91     delay(1);
92
93    digitalWrite(D1, HIGH);
94    digitalWrite(D2, HIGH);
95     digitalWrite(D3, LOW);
96    digitalWrite(D4, HIGH);
97    disp(11);
98    delay(1);
99
100     digitalWrite(D1, HIGH);
101    digitalWrite(D2, HIGH);
102    digitalWrite(D3,   HIGH);
103    digitalWrite(D4, LOW);
104    disp(10);
105    delay(1);
106  }
107   displayoff();
108  delay(1000);
109
110  // Humidity reading
111  for (int i =   0; i < 2000; i++) {
112    digitalWrite(D1, LOW);
113    digitalWrite(D2, HIGH);
114     digitalWrite(D3, HIGH);
115    digitalWrite(D4, HIGH);
116    disp(h1);
117     delay(1);
118
119    digitalWrite(D1, HIGH);
120    digitalWrite(D2, LOW);
121     digitalWrite(D3, HIGH);
122    digitalWrite(D4, HIGH);
123    disp(h2);
124     delay(1);
125
126    digitalWrite(D1, HIGH);
127    digitalWrite(D2, HIGH);
128     digitalWrite(D3, LOW);
129    digitalWrite(D4, HIGH);
130    disp(12);
131    delay(1);
132
133     digitalWrite(D1, HIGH);
134    digitalWrite(D2, HIGH);
135    digitalWrite(D3,   HIGH);
136    digitalWrite(D4, LOW);
137    disp(13);
138    delay(1);
139  }
140   displayoff();
141
142}
143
144void disp(int number) {
145
146  switch (number)   {
147    case 0 : // display '0' on 7 segment
148      digitalWrite(pinA, HIGH);
149       digitalWrite(pinB, HIGH);
150      digitalWrite(pinC, HIGH);
151      digitalWrite(pinD,   HIGH);
152      digitalWrite(pinE, HIGH);
153      digitalWrite(pinF, HIGH);
154       digitalWrite(pinG, LOW);
155      break;
156
157    case 1 : // display '1'   on 7 segment
158      digitalWrite(pinA, LOW);
159      digitalWrite(pinB, HIGH);
160       digitalWrite(pinC, HIGH);
161      digitalWrite(pinD, LOW);
162      digitalWrite(pinE,   LOW);
163      digitalWrite(pinF, LOW);
164      digitalWrite(pinG, LOW);
165      break;
166
167     case 2 : // display '2' on 7 segment
168      digitalWrite(pinA, HIGH);
169       digitalWrite(pinB, HIGH);
170      digitalWrite(pinC, LOW);
171      digitalWrite(pinD,   HIGH);
172      digitalWrite(pinE, HIGH);
173      digitalWrite(pinF, LOW);
174       digitalWrite(pinG, HIGH);
175      break;
176
177    case 3 : // display '3'   on 7 segment
178      digitalWrite(pinA, HIGH);
179      digitalWrite(pinB, HIGH);
180       digitalWrite(pinC, HIGH);
181      digitalWrite(pinD, HIGH);
182      digitalWrite(pinE,   LOW);
183      digitalWrite(pinF, LOW);
184      digitalWrite(pinG, HIGH);
185      break;
186
187     case 4 : // display '4' on 7 segment
188      digitalWrite(pinA, LOW);
189      digitalWrite(pinB,   HIGH);
190      digitalWrite(pinC, HIGH);
191      digitalWrite(pinD, LOW);
192       digitalWrite(pinE, LOW);
193      digitalWrite(pinF, HIGH);
194      digitalWrite(pinG,   HIGH);
195      break;
196
197    case 5 : // display '5' on 7 segment
198      digitalWrite(pinA,   HIGH);
199      digitalWrite(pinB, LOW);
200      digitalWrite(pinC, HIGH);
201       digitalWrite(pinD, HIGH);
202      digitalWrite(pinE, LOW);
203      digitalWrite(pinF,   HIGH);
204      digitalWrite(pinG, HIGH);
205      break;
206
207    case 6 : //   display '6' on 7 segment
208      digitalWrite(pinA, HIGH);
209      digitalWrite(pinB,   LOW);
210      digitalWrite(pinC, HIGH);
211      digitalWrite(pinD, HIGH);
212       digitalWrite(pinE, HIGH);
213      digitalWrite(pinF, HIGH);
214      digitalWrite(pinG,   HIGH);
215      break;
216
217    case 7 : // display '7' on 7 segment
218      digitalWrite(pinA,   HIGH);
219      digitalWrite(pinB, HIGH);
220      digitalWrite(pinC, HIGH);
221       digitalWrite(pinD, LOW);
222      digitalWrite(pinE, LOW);
223      digitalWrite(pinF,   LOW);
224      digitalWrite(pinG, LOW);
225      break;
226
227    case 8 : // display   '8' on 7 segment
228      digitalWrite(pinA, HIGH);
229      digitalWrite(pinB,   HIGH);
230      digitalWrite(pinC, HIGH);
231      digitalWrite(pinD, HIGH);
232       digitalWrite(pinE, HIGH);
233      digitalWrite(pinF, HIGH);
234      digitalWrite(pinG,   HIGH);
235      break;
236
237    case 9 : // display '9' on 7 segment
238      digitalWrite(pinA,   HIGH);
239      digitalWrite(pinB, HIGH);
240      digitalWrite(pinC, HIGH);
241       digitalWrite(pinD, LOW);
242      digitalWrite(pinE, LOW);
243      digitalWrite(pinF,   HIGH);
244      digitalWrite(pinG, HIGH);
245      break;
246
247    case 10 :  //   display 'C' on 7 segment
248      digitalWrite(pinA, HIGH);
249      digitalWrite(pinB,   LOW);
250      digitalWrite(pinC, LOW);
251      digitalWrite(pinD, HIGH);
252      digitalWrite(pinE,   HIGH);
253      digitalWrite(pinF, HIGH);
254      digitalWrite(pinG, LOW);
255       break;
256
257    case 11 :  // display 'o' on 7 segment
258      digitalWrite(pinA,   HIGH);
259      digitalWrite(pinB, HIGH);
260      digitalWrite(pinC, LOW);
261       digitalWrite(pinD, LOW);
262      digitalWrite(pinE, LOW);
263      digitalWrite(pinF,   HIGH);
264      digitalWrite(pinG, HIGH);
265      break;
266
267    case 12 : //   display 'H' on 7 segment
268      digitalWrite(pinA, LOW);
269      digitalWrite(pinB,   HIGH);
270      digitalWrite(pinC, HIGH);
271      digitalWrite(pinD, LOW);
272       digitalWrite(pinE, HIGH);
273      digitalWrite(pinF, HIGH);
274      digitalWrite(pinG,   HIGH);
275      break;
276
277    case 13 : // display 'u' on 7 segment
278      digitalWrite(pinA,   LOW);
279      digitalWrite(pinB, LOW);
280      digitalWrite(pinC, HIGH);
281      digitalWrite(pinD,   HIGH);
282      digitalWrite(pinE, HIGH);
283      digitalWrite(pinF, LOW);
284       digitalWrite(pinG, LOW);
285      break;
286  }
287}
288
289void displayoff()   {
290  digitalWrite(D1, HIGH);
291  digitalWrite(D2, HIGH);
292  digitalWrite(D3,   HIGH);
293  digitalWrite(D4, HIGH);
294}
295