Interlink-electronics Ring Sensor User Manual download pdf (Page 11)

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Ring Sensor

Integration Guide

Calculating the Touch Angle from Vtheta

The voltage Vtheta was measured by applying 256 counts over an angle of 240°. Voltage can

therefore be converted to angle by multiplying by 240/256. Conveniently, 240/256 reduces to the

ratio 15/16. If the touch was in zone 1, 120° must be added to the angle. If the touch was in zone 2,

240° must be added to the angle. And if the touch was in zone 3, no offset is required. Finally, the

result should be checked to see if it exceeds 359°. The following code example shows the complete

conversion of Vtheta to angle theta:

theta=(v_theta*15)/16; //convert from voltage to angle

if(1==zone) //Add necessary offsets

theta+=120;

else if (2==zone)

theta+=240;

else if (3==zone)

theta+=0;

if(theta>359) //sanity check angle

theta-=360;

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Interlink-electronics Ring Sensor User Manual Page 11