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Re: [Paparazzi-devel] MS4525 Airspeed sensor drivers

From: Rolf Noellenburg
Subject: Re: [Paparazzi-devel] MS4525 Airspeed sensor drivers
Date: Wed, 01 Jul 2015 12:07:39 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0


Yes, according to the datasheet, the AMS sensors are temperatur compensated.
I own two AMS sensors, one 5812-0003 and one 5812-0001. The biggest advantage of the -0001 is its resolution, at least for the airframe where I'm using it. The aircraft has a loiter airspeed of 8.5 m/s and is optimized for endurance. At this point, the resulution of the -0001 is about 0,0038 m/s whereas the resolution of the MS4525 would be 0,082 m/s (using the data provided by 3DR). This advantage gets smaller, the faster the aircraft travels. At 25 m/s the resolution is about 0,0013m/s and 0,028 m/s. Both resolutions should be more then enough at that speed.

Maximum speed for the -0001 is about 41 m/s, for the -0003 about 58 m/s and for the MS4525DO about 100 m/s (according 3DR).

Biggest advantage of the MS4525DO is, that it can be bought ready-to-use from 3DR with probe while the AMS needs some soldering (Resistors for I2C).

So, in my opinion, it depends on the aircraft and your soldering skills/will. I came from analog 7002s (in another airframe) and am more than happy with the performance of the AMS 5812-0001. But I think I will acquire a MS4525DO for faster planes, too.


Am 30.06.2015 um 21:43 schrieb Joseph Muhlhausen:

I believe AMS sensors are temperature compensate. MS4525 should be temperature compensated as well.

Tobi, is there any advantage of using AMS over MS45xx sensors? I only see that the AMS you recommend has a lower pressure operating range.

On Jun 29, 2015, at 4:39 PM, Eduardo lavratti <address@hidden <mailto:address@hidden>> wrote:

Tobi, amsys are temperature compensated ?
Have you used this sensors ?

Date: Mon, 29 Jun 2015 16:34:51 -0400
From: address@hidden <mailto:address@hidden>
To: address@hidden <mailto:address@hidden>
Subject: Re: [Paparazzi-devel] MS4525 Airspeed sensor drivers

Thanks guys!
I'm adding the MS45xx xml parameters to the wiki

I have requested pricing from AMSYS for their sensor.
Their seems to be a large discrepancy between MS4525 and AMS 5812-0003 pressure range. Does that mean that the pitot probe need to be different for each sensor?

On Mon, Jun 29, 2015 at 1:07 PM, Tobias <address@hidden <mailto:address@hidden>> wrote:

    Or you could try an amsys-sensor which is pretty good for
    airspeed measuring.
    AMS 5812-0001 <>
    AMS 5812-0003 <>
    depending on your speed range

    both are supported in ppz - see


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