1. Design requirements and goals
It is composed of STC89C51 single-chip microcomputer + MQ-3 alcohol sensor + ADC0832 module + LCD1602 module + alarm module + power supply.
Specific functions: 1. LCD1602 displays the alcohol concentration in real time;
2. You can set the alarm value by pressing the button to achieve sound and light alarm; three buttons: set Key, plus key, minus key.
3. When the concentration does not exceed the threshold, the green light flashes; when it exceeds the threshold, the red light flashes and the buzzer alarms.
2. Design ideas and plans
3. Hardware circuit
4. Program design flow chart
All materials include programs (notes), AD schematic diagrams, protues simulation, reference papers, program explanations, simulation explanations, simulation videos, schematic explanations, introductions to the use of materials, etc., the most comprehensive network! ! ( Https://www.cirmall.com/circuit/18389 )
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