Fake CO2 Meter - Teardown on ZN-2CO1 Air Quality Detector скачать в хорошем качестве

Fake CO2 Meter - Teardown on ZN-2CO1 Air Quality Detector

As the pandemic on going and we stay indoor more often, monitor carbon dioxide and other harmful TVOC particle in our living space since to be a good idea. But such sensor are usually price above 150-200 USD each, do we have a more affordable version? When I browse the internet, I stumble upon this : ZN-2CO1 Air Quality Detector And it claim it can detect : CO2 (400-6000PPM) TVOC (0-2.0mg/m3) HCHO (0-0.6mg/m3) and Temperature and Humidity as well. Cost well below 30 USD, which is way to cheap, knowing how much a normal CO2 sensor will cost like. I did a teardown, found out that It only have 2 sensor: DHT11 clone - Temperature and Humidity sensor, most probably clone TPM-300A-V2.2 TVOC Air Quality sensor - using TP-401 sensor Documentation below: http://www.szdovelet.com/product/html... https://solarbotics.com/wp-content/up... There is no CO2 Sensor or any precision sensor inside the product. The MCU of the display is STM32F0 china clone GD32, a lipo charging circuit, a switching regulator for 3.3V, a 2.4" IPS LCD display. The TPM-300A-V2.2 module actually output a data stream: 2C E4 00 5D 00 1B 01 BB 44 2C E4 is the module address 00 5D TVOC high low bit 00 1B CHOH high low bit 01 BB CO2 high low bit 44 Parity bit Conclusion: Don't buy this. the product is fake. The data read out is not the actual reading and just make out.