Pitot airspeed and i2c ms4525do

Ltech

Hello,

Do somebody play already with pitot Air transceivers I2C ms4525do?

https://www.mouser.com/datasheet/2/418/MS4525DO-710170.pdf

Thank you

JonnyMac

There doesn't seem to be a lot to reading values from the sensor -- except the required information seems to be spread across more than one document. The basics go like this:

pub read_pitot

  i2c.start
  i2c.write($51)                                                ' read; other ids are $6D and $8D
  i2c.read(bridge.byte[1], i2c#ACK)
  i2c.read(bridge.byte[0], i2c#ACK) 
  i2c.read(temp.byte[1],   i2c#ACK) 
  i2c.read(temp.byte[0],   i2c#NAK)
  i2c.stop

  if (bridge & $C000)                                           ' check status bits, should be %00
    return false

  temp >>= 5                                                    ' fix lsb of temp  

    
  ' do bridge and temp calculations here


  return true

In this suggestion, bridge and temp are global variables (words or longs). I'll leave the raw readings to useful values calculations to you.

Ltech

Whow, I didn't get one now.
Just inform if somebody have user experience

I go order one for testing

Thank you Jon

JonnyMac

You're welcome. Keep in mind that I don't have one either, I just translated the data sheet to Spin. Hope it helps you get going with the sensor.

Duane Degn

Just invcase you haven't seen these, here's a sensor with an a pitot tube.

I haven't used mine with the Propeller yet but I wouldn't think translating the open source C code to Spin shouldn't be too hard.

Ltech

Duan, that was the one I looking for.

There are two type of them, one with I2C(PX4), the other analogue (AMP cheap one).
I go for the I2C, just put in my basket.

Daniel