This Arduino code can be used to monitor the current temperature and humidity from a DHT sensor (DHT22 / DHT11) and log the data to an SD card. The program also relies on a DS1307 RTC connected over I2C for time keeping.
The data is read and recorded on the SD card every 60 seconds. While the data is read & written, an LED connected to D9 is also flashed to indicate activity.
If you want to use this code in your own project, make sure you correctly set the DHT pins/type as well as the CS pin for the SD card.
#define DHTPIN 7
#define DHTVCCPIN 2
#define DHTTYPE DHT22
#define CSPIN 4
#define LEDPIN 9
The code uses the following libraries:
- DHTlib by Adafruit Industries
- RTCLib by JeeLabs
- SdFat by William Greiman
All the libraries can be found inside the libraries/ directory.