Scheme of alcohol concentration tester based on single chip microcomputer

　　 Alcohol detector is an instrument used to detect whether the human body ingests alcohol and how much alcohol it ingests . It can be used as a detection tool for traffic police to detect how much alcohol drivers drink when enforcing the law , To effectively reduce the occurrence of major traffic accidents ; It can also be used in other occasions to detect the alcohol content in the exhaled gas of the human body , Avoid casualties and heavy property losses , For example, in some high-risk areas, enterprises prohibited from taking up posts after drinking .
　　
　　 Function introduction of alcohol tester scheme
　　
　　1. Turn it on ： Press and hold the key 2 Second power on , Buzzer “ di ” A sound ,LCD Full display 1 second .
　　
　　2. preheating ： Buzzer “ di ” A sound , Start 10 Seconds to warm up , Show at the same time ① Warm up sign ② battery level ③ Sensor life indicator ④10 Second countdown display ⑤ arc .
　　
　　3. measurement ： Buzzer “ di ” A sound , Start 10 Second measurement , Show at the same time ① Blowing sign ② battery level ③ Sensor life indicator ④10 Second countdown display ⑤ arc .
　　
　　4. result ： Buzzer “ di ” A sound , Start 10 The second result shows , Show at the same time ① Result flag ② battery level ③ Sensor life indicator ④ Measurement value and unit ⑤ arc ⑥ Warning level sign , The buzzer will sound when the result is out of range “ Diddiddidi ” Continuous alarm ; Press and hold the key in this state 2 Seconds to enter the history display .
　　
　　5. Historical record ： Buzzer “ di ” A sound , Display record number 1 second （1~50）, Then the history and units are displayed 9 second , Show at the same time ① Result flag ② battery level ③ Sensor life indicator ④ Warning level sign ; In this state , Short press the key to record the number increasing circularly , And restart the display timing ; In this state, the arc around the value is not displayed .
　　
　　6. To turn it off ： Buzzer “ di ” A sound , Display the sensor life indicator 1 Seconds later , The screen is turned off .
　　
　　 Alcohol tester scheme sensor life indicator
　　
　　1. Number of tests ≤500 when , green
　　
　　2. Number of tests ＞500 And ≤1000 when , yellow
　　
　　3. Number of tests ＞1000 when , Red
　　
　　4. Number of tests ＞2000 when , Flashing red
　　
　　5. Number of tests ＞2500 when , Jump straight to 【 To turn it off 】
　　
　　 Alcohol tester program battery power
　　
　　1. Battery voltage ≥3.7V when , The battery logo is displayed in full cells
　　
　　2. Battery voltage 3.3V~3.6V when , The battery logo is displayed in half space
　　
　　3. Battery voltage 3.2V when , The battery flag space displays
　　
　　4. Battery voltage 3.1V when , The battery flag space flashes
　　
　　5. Battery voltage 3.0V when , The battery flag space flashes , Jump straight to 【 To turn it off 】
　　
　　 Alcohol tester program warning level sign
　　
　　1. Measurement results ＜0.15mg/L when , Show green sign （ Security ）
　　
　　2. Measurement results ≥0.15mg/L And ＜0.25mg/L when , Show yellow sign （ Warning ）
　　
　　3. Measurement results ≥0.25mg/L when , Show red sign （ dangerous ）