Shineblink Raindrop sensor

Raindrop sensor

• • First, sensor introduction
  • Two, wiring diagram
  • Complete code
  • 4. Experimental process and conclusion

First, sensor introduction

• The raindrop sensor is simple and inexpensive, and can measure the presence and amount of raindrops by the contact between the parallel circuit exposed to the circuit board and the liquid.
• The DO pin of the sensor is used to indicate whether raindrops have been detected. If at least one raindrop has been detected, DO outputs a high level and stays low if not.
• The AO pin of the sensor outputs an analog voltage signal to indicate the number of raindrops detected.

Here, we only detect the voltage analog signal output by AO, because the voltage signal can not only reflect whether there are raindrops, but also see the size of rainfall. The DO interface is easier to use and can be implemented using the GPIO library functions provided by Core if the developer is interested, but not covered here.

Two, wiring diagram

Complete code

Print () : LIB_UsbConfig() : LIB_UsbConfig() : LIB_UsbConfig("CDC") -- Configure the AD voltage collection function and set the maximum sampling value4096The corresponding3.6V Input voltage -- when the channel is full1When, the cache is full, and the collection interval of each point is300ms LIB_ADConfig(1.300000)-- Start the big cyclewhile(GC(1) = =true) do-- Every 300ms check whether A0 channel conversion is complete -- developers can also connect sensors to any channel a1-A3, or multiple channels to multiple sensors, the usage is the same as belowLIB_DelayMs(300)
    A0_full_flag, A0_buf = LIB_ADCheckBufFull("A0")
    if A0_full_flag == 1Then -- Print the AD sampling value of channel A0 and the corresponding voltage value print(string.format("A0=%04d Voltage=%.2fv",  A0_buf[1], A0_buf[1] *3.6/4096.0))
    end end
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4. Experimental process and conclusion