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grovetemp: added a scaling factor to allow adjusting ADC values

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Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Mihai Tudor Panu
2016-05-06 11:38:32 -07:00
parent e3b59eb05b
commit 61f7803d92
2 changed files with 7 additions and 3 deletions
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5
src/grove/grove.cxx
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@@ -109,7 +109,7 @@ bool GroveRelay::isOff()
//// GroveTemp ////
GroveTemp::GroveTemp(unsigned int pin)
GroveTemp::GroveTemp(unsigned int pin, float scale)
{
if ( !(m_aio = mraa_aio_init(pin)) ) {
throw std::invalid_argument(std::string(__FUNCTION__) +
@@ -117,6 +117,7 @@ GroveTemp::GroveTemp(unsigned int pin)
return;
}
m_name = "Temperature Sensor";
m_scale = scale;
}
GroveTemp::~GroveTemp()
@@ -126,7 +127,7 @@ GroveTemp::~GroveTemp()
int GroveTemp::value ()
{
int a = mraa_aio_read(m_aio);
int a = mraa_aio_read(m_aio) * m_scale;
float r = (float)(1023.0-a)*10000.0/a;
float t = 1.0/(log(r/10000.0)/3975.0 + 1.0/298.15)-273.15;
return (int) round(t);