液位传感器使用手册.pdf

LiquidLevelSensorUserManualWaveshare

LiquidLevelSensorUserManual

1.Features

Operatingvoltage2.0V-5.0V

OutputtypeAnalogoutput

Detectabledepth48mm

Dimensions19.0mm*63.0mm

Fixingholesize2.0mm

Operatingprinciple:

Thismoduleisanapplicationofthecurrentamplificationbyatransistor.

Whentheliquidlevelishighenoughtoconductthecurrentbetweenthe

baseandthepositivepowersupply,acertainamountofcurrentis

generatedbetweenthebaseandtheemitter.Andinameanwhile,an

electriccurrentisproducedinacertainamplificationfactorbetweenthe

collectorandtheemitter,andappliedtotheresistantintheemitterto

produceavoltage.Then,thisvoltagewillbecollectedbyanADconverter.

2.Applications

Thismodulecanbeappliedtoliquidlevelalarmsystem.

3.Interfaces

PinNo.SymbolDescriptions

1AOUTAnalogoutput

2GNDPowerground

Positivepower

3VCC

supply(3.3V-5.0V)

4.Howtouse

Wewillillustratetheusageofthemodulewithanexampleofliquidlevel

detectionbyconnectingadevelopmentboard.

①Downloadtherelativecodestothedevelopmentboard.

②ConnectthedevelopmentboardtoaPCviaaserialwireandthe

moduletothedevelopmentboard.Then,powerupthedevelopment

boardandstarttheserialdebuggingsoftware.

Hereistheconfigurationoftheconnectionbetweenthe