Arduino Infra Red Sharp Lib

Based on an original work of Dr. Marcal Casas-Cartagena .

1. Perform 25 reading of analog pin (Nb samples can be changed in .h)
2. Sort values
3. Convert median value to cm

• #include <SharpIR.h>
• SharpIR sharp(ir_analog_pin, model);
• int dist = sharp.distance();

| Volt | Distance | | 2,8 | 15 | | 2,5 | 20 | | 2 | 30 | | 1,55 | 40 | | 1,24 | 50 | | 1,05 | 60 | | 0,905 | 70 | | 0,82 | 80 | | 0,7 | 90 | | 0,66 | 100 | | 0,6 | 110 | | 0,55 | 120 | | 0,5 | 130 | | 0,455 | 140 | | 0,435 | 150 |

Using MS Excel, we can found folowing formula (For distance > 15cm) :

Distance = 60.374 X POW(Volt , -1.16)

| Volt | Distance | | 2,6 | 10 | | 2,1 | 12 | | 1,85 | 14 | | 1,65 | 15 | | 1,5 | 18 | | 1,39 | 20 | | 1,15 | 25 | | 0,98 | 30 | | 0,85 | 35 | | 0,75 | 40 | | 0,67 | 45 | | 0,61 | 50 | | 0,59 | 55 | | 0,55 | 60 | | 0,5 | 65 | | 0,48 | 70 | | 0,45 | 75 | | 0,42 | 80 |

Using MS Excel, we can found folowing formula (For distance > 10cm) :

Distance = 29.988 X POW(Volt , -1.173)

Based on the SHARP datasheet we can calculate the linear function: y = 137500x + 1125 which gives us: 1 / ((Volt - 1125) / 137500) = distance_in_cm (For distance > 100cm)