Ohms law basic calculations for calculating R2 in voltage divider when R1 is known and to calculate voltage drop ratio when both R1 and R2 are known.
Diff: ohms.cpp
- Revision:
- 0:fe642275688d
- Child:
- 2:1c29960a42c6
- Child:
- 3:b4592b0ae1e3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ohms.cpp Mon Mar 07 23:27:37 2016 +0000 @@ -0,0 +1,40 @@ +#include "mbed.h" +//#include "ohms.h" + + +float volDivideCalcRatio(long r1, long r2) { + return ((float) r2 / (float) (r1 + r2)); +} +float voltDivideAdjVolt(float vin, long r1, long r2) { + float ratio = ((float) r2 / (float) (r1 + r2)); + return vin / ratio; +} + + + + +long calcResistV(long refResistR1, float maxV, float measuredV) { + float VDrop = maxV - measuredV; + float dropRatio = measuredV / VDrop; + return (long) (refResistR1 * dropRatio); +} + + +/* + +adjVoltDivide::adjVoltDivide(long r1, long r2, float refVolt) { + _r1 = r1; + _r2 = r2; + _refVolt = refVolt; + _ratio = volDivideRatio(r1, r2); +} + +float adjVoltDivide::read(AnalogIn apin) { + return apin.read() / _ratio; +} + +uint16_t adjVoltDivide::read_u16(AnalogIn apin) { + return (int) ((float) apin.read_u16() / _ratio); +} + +*/ \ No newline at end of file