Parallax and Maxbotix ultrasonic sensors

[Phalanx]

We used the Maxbotics EZ-1 last season using analog with good results.

The formula we used:
Mv =( (adc * 5000) / 1024 )
Inches = Mv / 10
Gave use the distance in inches for the version that used 10mV per inch.

It was changed from 10mV to 9.8mV
So in your case you might want to try:
Mv =( (adc * 5000) / 1024 )
Inches = Mv * 10 / 98

[Lucretius]

Thanks for the tips regarding the Maxbotix EZ sensors (we'll be using the EZ0).

We actually got the Parallax Ping))) working with the built-in WPIlib functions. The only modification was to convert the two ends of a PWM Y-connector to female so we could plug them into two digital in/outs. Worked like a charm!

[pogenwurst]

Originally Posted by Phalanx

We used the Maxbotics EZ-1 last season using analog with good results.

The formula we used:
Mv =( (adc * 5000) / 1024 )
Inches = Mv / 10
Gave use the distance in inches for the version that used 10mV per inch.

It was changed from 10mV to 9.8mV
So in your case you might want to try:
Mv =( (adc * 5000) / 1024 )
Inches = Mv * 10 / 98

I was just looking at the datasheet for the newer versions with 9.8 mV / in. scaling, and it does not specify "9.8" but rather "~9.8". The exact scaling factor for 5V power is (5000 / 512) mV / in.

It shouldn't make much of a difference, but that sort of thing bothers me.

[d235j]

We just divide the analog output by 2 to get the reading in inches.