GroveWFS Class Reference

C++ API for the Grove Water Flow Sensor. More...

Detailed Description

• ID: grovewfs
• Name: Grove Water Flow Sensor
• Category: liquid
• Manufacturer: seeed
• Link: http://www.seeedstudio.com/wiki/index.php?title=G1/2_Water_Flow_sensor
• Connection: gpio

This sensor is used to measure water flow, in LPM (Liters Per Minute). It incorporates a Hall Effect Sensor. The UPM module defines an interrupt routine to be triggered on each low pulse, keeping count. This device requires a 10K pullup resistor for the signal line (yellow wire). There is a schematic diagram on the seeedstudio site (3/2015): http://www.seeedstudio.com/wiki/index.php?title=G1/2_Water_Flow_sensor

However, be careful in wiring this up - the schematic appears to have a bug in it: the lower left connection of the signal line (yellow) to Vcc (red) should not be there. The sensor may work with this connection, but probably not for very long.

  // Instantiate a Grove Water Flow Sensor on digital pin D2
  upm::GroveWFS* flow = new upm::GroveWFS(2);
  
  // set the flow counter to 0 and start counting
  flow->clearFlowCounter();
  flow->startFlowCounter();

  while (shouldRun)
    {
      // we grab these (,illis and flowCount) just for display
      // purposes in this example
      uint32_t millis = flow->getMillis();
      uint32_t flowCount = flow->flowCounter();

      float fr = flow->flowRate();

      // output milliseconds passed, flow count, and computed flow rate
      cout << "Millis: " << millis << " Flow Count: " << flowCount;
      cout << " Flow Rate: " << fr << " LPM" << endl;

      // best to gather data for at least one second for reasonable
      // results.
      sleep(2);
    }

  flow->stopFlowCounter();

Public Member Functions
	GroveWFS (int pin)
	~GroveWFS ()
uint32_t	getMillis ()
void	initClock ()
void	clearFlowCounter ()
void	startFlowCounter ()
void	stopFlowCounter ()
uint32_t	flowCounter ()
float	flowRate ()

Static Public Member Functions
static void	flowISR (void *ctx)

Constructor & Destructor Documentation

GroveWFS

(

int

pin

)

GroveWFS constructor

Parameters

pin	digital pin to use

~GroveWFS

(

)

GroveWFS Destructor

Member Function Documentation

uint32_t getMillis

(

)

Return the number of milliseconds elapsed since initClock() was last called.

Returns

elapsed milliseconds

void initClock

(

)

Reset the Clock

void clearFlowCounter ( )

inline

Reset the flow counter to 0. The flow Counter should be stopped via stopFlowCounter() prior to calling this function.

void startFlowCounter

(

)

Start the flow counter

void stopFlowCounter

(

)

Stop the flow counter

uint32_t flowCounter ( )

inline

Get the flow Counter

Returns

the flow counter

void flowISR ( void *  ctx )

static

Flow Interrupt Service Routine

float flowRate

(

)

Compute the flow rate in liters per minute (LPM)

Returns

the computed flow rate

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The documentation for this class was generated from the following files:

• /var/lib/jenkins/workspace/upm-doc-stable/src/grovewfs/grovewfs.h
• /var/lib/jenkins/workspace/upm-doc-stable/src/grovewfs/grovewfs.cxx