A Clark
/
RF_ID
Log Test Code
Fork of VoltageThreshold by
main.cpp
- Committer:
- ajclark2
- Date:
- 2014-03-28
- Revision:
- 1:2178a66e1223
- Parent:
- 0:e99407475b62
- Child:
- 2:d5b23f4e6884
File content as of revision 1:2178a66e1223:
#include "mbed.h" #define PI 3.1415926 AnalogIn ain_v1(p20); // //AnalogIn ain_v2(p19); int main() { float v1, m, b, p_in, c, r, f int value1 // Voltage to Power calculations v1 = ain_v1; // Comes from mBed (Can adjust manually for now) b = 2.095; // (volts) Direct function generator measurement m = .0316; // volts/dBm (Calculated at 2000 MHz and 0 and -40 dBm) p_in = (v1-b)/m; // Derived from v = m*p+b (linear relationship of voltage and power) // m = slope , v1 = vin, b = y-intercept // Range equation Terms Pt = .001; //(mW or 0 dBm) Power Transmitted. This should be constant for a phone I think... it just changes with the function generator Gt = 1; // Unitless (1 for FG) Gr = ??; // How do we get this? Should be on datasheet... but calc required? Pr = p_in; // Free Space Loss Terms f = 2000 // (MHz) This will be constant for a phone... but what to put for the FG c = 2.99792458*10^8; r = [c*(sqrt(Pt*Gt*Gr)/Pr)]/(4*PI*f); }