Design of Frequency Detection Module Based on ARM Processor and LM331

In the article, a frequency signals detection module used in underground monitoring sub-station is designed, module hardware contains S3C2440 processor, LM331 frequency-voltage converter,74LS1511-of-8 line data selector. On the software level, module contains Linux OS and Qt as a display tool. Finally module achieves the target of collection, measurement and display of 8-channel frequent signals.