Practical Smoking Cessation Alarm: Traditional Chinese Circuit Design
In short: Traditional Chinese Practical Smoking cessation alarm. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 5124 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Quit smoking alarmWhen the room is filled with cigarette smoke after smoking, this device will emit a loud and harsh verbal alarm "Don't smoke anymore..." It will prompt the owner to put out the cigarette, and then open the windows to ventilate the room, thereby reducing the harm of nicotine to people.The device can also be made into fire alarms and household gas leakage alarms.This device is composed of a gas-sensitive detection head, a monostable trigger, a speech sound source IC and a boost amplifier alarm. Its electrical schematic is shown in Figure 212.Figure 212How it works:When the surface of the gas sensor MQK-2 absorbs smoke or flammable gas, the resistance between its BL electrodes decreases. At this time, the potential of node C drops due to the partial pressure of the resistance between RP2, R1 and BL. When its potential drops to ≤1/3Vcc, the ② pin of IC1 is triggered, and the monostable trigger composed of IC1 flips, and its ③ pin outputs a high level. It uses R3, C2, …
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Lei Cheng
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