case for breath analyzer

thingiverse

a case for a simple breath analyzer kit i found online (the circuit is NOT my own design) it uses a gas sensor called MQ-3. (which is essentially just a variable resistor that reacts to ethanol content inside its chamber) U1 is a 555timer R1, R2 =1kohm R3= 130ohm R4 = 5ohm RW = 10kohm potentiometer B1= buzzer the relay JK is normally closed. here is a video clip i was testing the kit with a piece of tissue paper dipped in alcohol https://youtu.be/xzdle4n3I8g

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