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Proof of concept for distance and temperature monitoring
Dependencies: mbed mbedConnectorInterface mbedEndpointNetwork
Diff: GroveTemp.cpp
- Revision:
- 0:cb422b231ea5
- Child:
- 2:fa0acc891712
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/GroveTemp.cpp Fri May 01 23:21:36 2015 +0000 @@ -0,0 +1,50 @@ +#include "mbed.h" +#include <math.h> +#include "GroveTemp.h" + +AnalogIn thermistor(A0); /* Temperature sensor connected to Analog Grove connector */ + +GroveTempSensor::GroveTempSensor() { + resetMinMax(); +} + +float GroveTempSensor::getTemp() { + unsigned int analogRead; +// units, +// tens; + + analogRead = thermistor.read_u16(); /* Read analog value */ + + /* Calculate the resistance of the thermistor from analog votage read. */ + resistance = (float) 10000.0 * ((65536.0 / analogRead) - 1.0); + + /* Convert the resistance to temperature using Steinhart's Hart equation */ + temperature = (1/((log(resistance/10000.0)/TEMP_BETA) + (1.0/298.15)))-273.15; + +// units = (int) temperature % 10; +// tens = (int) temperature / 10; + if (temperature > maxTemp) + maxTemp = temperature; + if (temperature < minTemp) + minTemp = temperature; + + return temperature; +} + +void GroveTempSensor::resetMinMax() { + maxTemp = -999.9; + minTemp = 999.9; + minMaxDefined = false; +} + +float GroveTempSensor::getMin() { + if (!minMaxDefined) + getTemp(); + return minTemp; +} + +float GroveTempSensor::getMax() { + if (!minMaxDefined) + getTemp(); + return maxTemp; +} \ No newline at end of file