IMU shield

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BanziMassimo
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Joined: Thu Aug 09, 2018 6:00 am

IMU shield

Post by BanziMassimo » Thu Aug 09, 2018 6:05 am

Hallo
i'm massimo banzi ( not the Arduino one alas) and i'm interested in fall detection systems.
Would like to know what is the difference between the Photon IMU shield and the MPU-9250 9 axis MEMS
Thank You
Massimo

jremington
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Re: IMU shield

Post by jremington » Sat Aug 11, 2018 10:34 am

They use completely different chips measure acceleration, rotation and magnetic fields, so the only similarity is the goal.

BanziMassimo
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Re: IMU shield

Post by BanziMassimo » Sat Aug 11, 2018 1:33 pm

What are the chipset in IMU shield than?

jremington
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Re: IMU shield

Post by jremington » Sat Aug 11, 2018 7:26 pm

Is that a joke question, or are you really too lazy to read the product description?

BLH
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Re: IMU shield

Post by BLH » Sun Aug 12, 2018 6:28 am

It is on the main sales screen for the device.
LSM9DS1

BanziMassimo
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Joined: Thu Aug 09, 2018 6:00 am

Re: IMU shield

Post by BanziMassimo » Mon Aug 13, 2018 1:38 am

Sorry guys, new to the topics, i red it but too many acronyms.
So be patient please.
As said i am trying the several solution i can use for assembling a accelerometer with a chip and a wifi module as well as a LiPo battery
I set up a bundle with photon, the particle, IMU shield and battery shield.. it seems to fit well my requirements.
But than i saw the SparkFun 9DoF Razor IMU M0, but it miss the wifi module. What could i use with it?
Finally i saw the SparkFun ESP8266 Thing: i could bundle it with IMU Breakout - MPU-9250, right? But to progrma it it seems i need a separate module the FTDI... a mess! it seems to me that Photon is the best solution (even wifi programmable i red) even if the assembòy result larger and not programmable with arduino IDE.
What can you suggest folks? Can provide any suggestion please?

jremington
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Re: IMU shield

Post by jremington » Mon Aug 13, 2018 9:10 am

Many accelerometers have a "free fall detection" output.
The popular ADXL345 is one of those.

BanziMassimo
Posts: 5
Joined: Thu Aug 09, 2018 6:00 am

Re: IMU shield

Post by BanziMassimo » Mon Aug 13, 2018 9:24 am

yes, but apparently only using accelerometer data, results in a lot of false positives. Many algorithm combine gyroscope data (and magnetometer too for orientation) to provide more secure outputs. I also would like to add some AI to the algorithm so i need a little computational abilities from the chipset. I was inspecting the Razor IMU M0 combined with ESP8266 WiFi Module (even if i do not need a memory slot). But if i correctly understand i have two processors this way and fear about consumption. I need to put in sleep mode the wifi until an event occurs to prevent execessive use of battery ( i was thinking at a 2Ah LiPo battery for ensuring at least 24 h of coverage)

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