The DHT11 is a simple and inexpensive temperature and humidity sensor, which is ideal for small projects with the Arduino, in which it does not depend on a high degree of accuracy of the measurements. It should be used for indoor measurements.
DHT11 – Temperature and Humidity Sensor
Sensors, like the DHT11, are virtually the senses in the world of microcontrollers. With them you can observe, for example, environmental influences, and possibly respond. In this case we deal with the temperature and humidity measurement and therefore we have almost a small weather station.
Temperature & humidity measurements with the DHT11
The Tiny RTC breakout board with the DS1307 real time clock chip from Maxim Integrated Products allows time-and date-dependent circuits with the Arduino or other microprocessor environments. Data logger, timer or alarm clock are just some example applications. In addition, the board has an ATMEL 24C32 EEPROM chip with 32 Kbits memory and still the ability to add a separate temperature sensor (DS18B20).
Tiny RTC – DS1307 real time clock – breakout board
As a quasi-nostalgic relic of an almost extinct generation of cell phones we use today, the Nokia 5110 LCD screen from the cellular phone with the same name, kindly as a breakout board for a small budget. Because the display operates at 3.3V, we use it together with a 8MHz clocked Arduino Pro Mini, which also runs at 3.3V.
Nokia 5110 LCD, an Arduino Pro Mini 3.3V with 8MHz clock frequency
In order not to have to spend more information on the serial monitor, it is recommended to connect a display. The presented 1.8-inch TFT color display with SPI interface can help here. It has 128×160 pixels and needs in the minimum case, only 4 ports.
1.8 inch TFT color display with SPI interface (HY-1.8 SPI) and SD card support
The GY-65 is a simple breakout board for Bosch BMP085 barometric pressure sensor with integrated temperature measurement. The values can be a simple used for weather forecast, more precise (GPS) navigation (level measurement, as well as vertical climb and descent).
BMP085 breakout board (GY-65) air pressure and temperature sensor
With the TEA5767 chip from Philips, especially the mini breakout board presented here, you can build – together with an Arduino or similar microcontroller environments – a small, via the I ² C interface programmable, stereo FM radio. In a similar design you can find the module in many mobile phones.
TEA5767 FM stereo radio breakout board
For experimenting with more external modules and the Arduino, it’s recommended to use an external power source. Also modules with 3.3V or 5V can quickly become confusing on the workplace. A solution could be this module, which can be directly plugged onto the breadboard.
Breadboard-Spannungsversorgung (Power Supply Module)
The Arduino Uno is a development board with the ATMEL ATmega328P chip in a DIP package. It has an USB port, which is provided by an additional ATmega16U.
Arduino Uno (R3)
The Arduino Nano is a small development board, which is particularly well suited for direct development on breadboards. Through the USB connection software updates can be applied quickly and easily.
Arduino Nano (again a China clone)
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