Ultrasonic distance sensor

Specifications

The heart of the system is the Atmega 8515 microcontroller. It has 8 KB flash memory, 512 bytes EEPROM and 512 bytes SRAM onboard . Moreover, it is in able to handle 64KB external memory. It has many interfaces, thanks to which it is possible to communicate widely with peripheral devices. It is produced in many cases types, even having 44 pins down use. The power supply of the microcontroller itself varies from 4.5 to 5V but manufacturer applied more economical version, allowing the system to work from 2.7V . We can also note that the quartz was added, what definitely improves the timing of the entire microcontroller . Second the most important part of the entire device is the distance sensor. It’s an ultrasonic sensor based on, among others, operational amplifier, what gives possibility of transmission and waterproof probe . Digital sensor was used to test the temperature inside the tank. Moreover, on the PCB board there is room for an additional sensor, and on use of type K thermocouples to perform checking measurements. Numerical data showing the milk content in the tank will be displayed on 7-segment displays. To their drivers with eight outputs were used to handle also dots located on the displays. 12-bit DAC converters are used to output voltage or current on output after applying an analog signal to their inputs. The last layout attached to the the distance sensor is membrane keyboard. It was designed for probe handling measuring. There are pads with the buttons, on which will be added LEDs illuminating in an appropriately programmed manner.