I recently completed the build of my amphibious quad and would like to add a sonar to it. I see there are a number of outdoor sensors available from Maxbotix (http://maxbotix.com/Ultrasonic_Sensors/MB7383.htm) but I'm not sure which ones are compatible with APM 2.5, since none of them are listed in the dropdown menu of the Sonar Config page in Mission Planner. Can anyone tell me which sensor(s) would work well and what the proper APM config would be?
Hello, this is Tom Bonar from MaxBotix Inc.
I saw your forum post and I would like to lend some assistance. The MB7383 can use the same code as the XL-MaxSonar-EZ0 in your APM2.5 coding. The reason for this is the Analog Voltage output has a resolution of 10mm per bit. So if you are reading the sensor with a 10bit ADC, 1 bit is equal to 1cm, like the MB1200 that is selectable with the APM2.5 coding software.
If you are reading the analog voltage and need to convert the mV output the scaling is (Vcc/1024)=mV per 10mm.
Please be aware that the MB7383 is not designed for underwater use. If you wish to use the sensor underwater, I would recommend checking out this video that one of our end users made regarding this topic. http://www.designspark.com/blog/coconut-pi-individual-components-de.... I stated, we do not support or warranty underwater applications.
Our MaxSonar-WR sensors IP67 rating is meant to show that it can handle rugged environments.
Please let me know if you have any questions.
Thanks for the info Tom. The problem is that I didn't think I was going to get a response from my emails and this posting so I already made what I thought was an educated guess and ordered an MC7068 with the compact housing, in an effort to keep weight to a minimum. Will this work with any of the APM 2.5 coding? If not, can I exchange it for a sensor that is compatible? I haven't even taken it out of the package yet.
This is Tom Bonar from MaxBotix Inc.
The MB7068 will use the same analog voltage scaling as the MB1200 in the APM2.5 coding. The scaling is Vcc/1024=V per cm for both sensors. Please be aware that the MB7068 has a stability filter. If the target moves more than 10cm with in 3 readings, the sensor will not see that reading series as valid. If you want, please email me at email@example.com and we can further discuss your application to make sure the right sensor has been selected for your application. If an exchange is needed, this will help facility a change if there is one that is needed.
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Hi Arbutus, looks like the doc's URL has changed, there is this page which gives various options.... http://ardupilot.org/copter/docs/common-rangefinder-landingpage.html