Live Temperature and humidity monitoring station

1#include <DHT.h>
2#include <DHT_U.h>
3#include <TM1637Display.h>
4
5// ---------------- DHT11 ----------------
6#define DHTPIN 2       // DHT11 signal pin connected to D2
7#define DHTTYPE DHT11
8DHT dht(DHTPIN, DHTTYPE);
9
10// ---------------- TM1637 Displays ----------------
11#define CLK1 3   // First display CLK pin
12#define DIO1 4   // First display DIO pin
13#define CLK2 5   // Second display CLK pin
14#define DIO2 6   // Second display DIO pin
15
16TM1637Display display1(CLK1, DIO1);  // For temperature
17TM1637Display display2(CLK2, DIO2);  // For humidity
18
19// ---------------- Custom segment maps ----------------
20// Segment encoding: 0b0GFEDCBA
21// Example for custom letters
22const uint8_t LETTER_C = SEG_A | SEG_F | SEG_E | SEG_D;    // "C"
23const uint8_t LETTER_H = SEG_F | SEG_E | SEG_B | SEG_C | SEG_G; // "H"
24
25// --------------------------------------
26void setup() {
27  dht.begin();
28  display1.setBrightness(0x0f);  // Max brightness
29  display2.setBrightness(0x0f);
30}
31
32void loop() {
33  float temp = dht.readTemperature();   // Read temp in Celsius
34  float hum  = dht.readHumidity();      // Read humidity
35
36  if (isnan(temp) || isnan(hum)) {
37    // Error handling
38    display1.showNumberDecEx(0, 0, true);
39    display2.showNumberDecEx(0, 0, true);
40    delay(2000);
41    return;
42  }
43
44  // ---- Display Temperature: e.g. "28 C" ----
45  int t = (int)temp;
46  uint8_t tempData[] = {
47    display1.encodeDigit((t / 10) % 10), // tens
48    display1.encodeDigit(t % 10),        // ones
49    0x00,                                // space
50    LETTER_C                             // "C"
51  };
52  display1.setSegments(tempData);
53
54  // ---- Display Humidity: e.g. "98 H" ----
55  int h = (int)hum;
56  uint8_t humData[] = {
57    display2.encodeDigit((h / 10) % 10), // tens
58    display2.encodeDigit(h % 10),        // ones
59    0x00,                                // space
60    LETTER_H                             // "H"
61  };
62  display2.setSegments(humData);
63
64  delay(2000);  // Update every 2s
65}