Microcontroller makes effective frequency counter


Posted on Jan 20, 2013

Figure 1 shows an efficient and cost-effective frequency counter using an Atmel 89C2051 µC (Reference 1). The design can use any µC of the 8051 family. The circuit counts frequency and sends the count to a PC via the serial port. The signal connects to pin 3.4 of the µC. The TTL-compatible output of the µC drives the 1488, which converts the output to RS-232 voltage levels. The output of the 1488 connects to the RxD pin on the serial port of the PC.






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