Adopts PCF8951 chip Supports external 4-way voltage input acquisition (voltage input range is 0 to 5 v) Integrated photosensitive resistance can pass AD gathering accurate numerical value of environmental light Integrated thermal resistor can pass AD collection environment temperature precise values Integrated 0 to 5V voltage input acquisition (by blue potentiometer to adjust the input voltage) After With power indicator light (for the module power supply indicator goes on) With DA output module when the module DA output voltage reaches a certain value DA output indicator light will light up board the bigger the voltage the brighter the indicator