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4 digit 7-segment LED display module driven by two serial 74HC595s
3v regulator is both a reliable reference voltage and also reliably runs SD cards that require a lot of power to run
Structure is solidly built and quiet stable
Furthermore
RGB 65K true to life colours
CCS811 Carbon Monoxide Gas Sensor Soldered:With Soldered Pins 4 digit 7-segment LED displayDescription: The CJMCU 811 is an ultra low power digital gas sensor that integrates a sensor and a CCS801 bit MCU with an analog digital converter (ADC) for detecting indoor air quality, including carbon monoxide (CO) and a wide range of Volatile Organic compounds (VOCs). Feature: Ultra low power consumption can be used in battery powered equipment High sensitivity, fast heating Intelligent algorithm calculates TVOC eCO2 values I2C signal output,