This text introduces an alcohol concentration detector ,which is designed taken single chip computer and gas sensor as kernel .The alcohol concentration can be measured in different environment . The design is based on the STC89C52RC Single -Chip Computer, using MQ3 Gas Sensor and A/D Transformer to realize the alcohol concentration detection .It will be shown through the LED Nixie tube. When the alcohol concentration parameter preponderates over what we set, Single -Chip Computer will drive the alarm module , at the meantime the LED immediately shows the alcohol concentration.So it can measure the alcohol concentration.What’s more, it can remind us of danger.The valve value could be set according to the different environment . In this paper , the whole construct of the alcohol concentration detector is introduced ; the system hardware circuit is designed ; the software flowchart is outlined. The System is made up of seven parts: alcohol concentration measurement module, A/D Transformer module,Single -Chip Computer control module, keyboard input module, LED display module, alarm module and communication module .
Keywords: ST89C52RC,alcohol concentration detector，MQ3 Gas Sensor,A/D Transformer
