Sensor: introduction of soil moisture sensor (xh-m214) and STM32 drive code

This paper mainly introduces ：stm32f103 ADC Read voltage Collect soil moisture sensor （XH-M214） data

XH-M214 brief introduction

XH-M214 The real object looks like this ：

The one that looks like a fork is a sensor , Measuring soil moisture changes with the change of soil conductivity （ Soil resistance increases with drought ）. Measure the resistance between the two electrodes of the sensor .
The blue module is a voltage comparator and a voltage divider , The pin is defined as follows ：

One is analog signal output , And measured soil moisture , There is also a switch signal output , Because there is a comparator , When the threshold is exceeded, the flag bit is output .
Its and schematic diagram are as follows ：

Working voltage 3.3v-5v, Working current ：100mA within

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