Ultrasonic sensor SRF08 is sometimes also called as sonar. It is an ultrasonic obstacle detector. It is able to measure the distance up to 11 m. The principle of measurement of the sensor is the ultrasonic signal on the eighth periods and a frequency of 40 kHz. Sonar measures the time between sending the test signal and the receiving of its reflection. Measured values (individual reflections) are stored up to 16 registers from which data can then be read master system. From this principle it follows one of the biggest advantages of this sensor - possibility of measuring objects only at desired distances. The sensor communicates via I2C bus. This fact allows you addressing of the sensor and also create sensor arrays. In addition to changing the base address, which is set in production, the sensor enables the selection of units and output variables measuring ambient light. Sonar is also suitable for use in neural networks