Design of an in-vehicle hazard warning device with human safety in mind

Aiming at the frequent occurrence of asphyxiation accidents in children's cars, this design introduces a vehicle hazard alarm device, integrating temperature and oxygen concentration monitoring. With STC89C52 as the core, it realizes data acquisition, processing, display and alarm. DS18B20 accurately measures the temperature, and the output is fully digitized; the oxygen concentration monitoring innovatively adopts the potentiometer simulation, which is converted to display by ADC0809. The design is simple and novel, effectively preventing the risk of asphyxiation and safeguarding children's safety, which has important practical value.