Thank you for taking the time to explore the avrprojects website. Here you can find projects about AVR 8-bit microcontrollers. We hope you´ll find these pages both educational as inspiring.
The ATMega328 board is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a RS232 connection, a power jack, an ICSP header, and a reset button.
The LM335AZ is a cheap (0,75 €) temperature sensor that reads the surrounding temperature and is calibrated in degrees Kelvin. The LM335 has an output from −40°C to 100°C.
With this circuit you can control two unipolair stepper motors in full step mode via the RS232 serial port of your PC. A terminal program such as Hyperterminal can be used to control the stepper motors. The stepper motors can be driven one at a time.
The DHT11 sensor is made of two parts, the capacitive humidity sensor and the thermistor. There is also a basic chip inside that converts the analog signal to a digital signal with the temperature and the humidity.The digital signal is easy to read using a microcontroller.
A photocell or photo resistor is a Light Dependent Resistors (LDR). LDR's are sensors that detect light. They are small, inexpensive, low-power, easy to use and don't wear out.
The HDSP2111 is a very nice LED display, the can show 8 alphanumeric characters in a 5 x 7 dot matrix, and are all packaged in a standard 15.24 mm (0.6 inch) 28 pin DIP. The onboard CMOS IC has 128 ASCII characters which are permanently stored in ROM.