Human ear hears sound frequency of 20Hz-20KHZ. Ultrasonic is the sound wave beyond 20 KHz. Ultrasonic ranging module HC - SR04 provides 2cm - 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules includes ultrasonic transmitters, receiver and control circuit.
This module can be used as line sensing, light or fire sensor. It can also be used for line following purpose and obstacle detection. IR LED in the circuit emits IR rays. When an object or white surface comes in front of the module, some rays are reflected back and are collected by the photodiode. A NPN Bipolar transistor is used as a switch t
The PIC12F508/509/16F505 devices from Microchip Technology are low-cost, high-performance, 8-bit, fully-static, Flash-based CMOS microcontrollers. They employ a RISC architecture with only 33 single-word/ single-cycle instructions. All instructions are single cycle (200 μs) except for program branches, which take two cycles. The PIC12F508/509/16
The PIC16F627A/628A/648A are 18-pin Flash-based members of the versatile PIC16F627A/628A/648A family of low-cost, high-performance, CMOS, fullystatic, 8-bit microcontrollers. All PIC® microcontrollers employ an advanced RISC architecture. The PIC16F627A/628A/648A have enhanced core features, an eight-level deep stack, and multiple internal and