Calibrate formula for PING

Bronson

Considering about environment affecting Ping sensor, can someone provide me a formula code for calibrating Ping?
The purpose of this is I can adjust the Ping to suit the environment.

At this moment, my formula is DISTANCE = (2260 ** TIME).

If I can calibrate, I can re-calculate the constant value (2260) according to environment.
The problem is I don't really understand how to invert ** operation.

Regards,
Bronson Alex

$WMc%

What does your code look like?

Tracy Allen

You set up the calibration reflector at a known DISTANCE and measure TIME on the Stamp. Then apply the following inversion routine. The result is the factor (like 2260) that you need to use subsequently
in DISTANCE = factor ** TIME.

'---------binary division loop-----------

[COLOR=#ff0000]' Enter with distance < time, distance<32768, time<32768
 FOR idx=15 TO 0               ' 16 bits 
   distance = distance // time << 1    ' remainder*2 
   F.Bit0(idx) = distance/time     ' next bit 
 NEXT 
 RETURN ' F is the factor for **[/COLOR]

There is an explanation at this URL.

Bronson

Tracy: Thanks a lot for your code! I will try your code...