Reddit reviews Stratux AHRS 2.0 - Sensors and Fan Controller/Raspberry Pi MPU9250+BMP280

Here is how I implimented it.

https://www.reddit.com/r/stratux/comments/4qo0r3/pwm_fan_control_howto_guide/

We actually produced an AHRS module that integrates a fan controller if you do not want to solder anything.

https://www.amazon.com/Stratux-Sensors-Controller-Raspberry-MPU9250/dp/B06ZZCHBHT

It was in the description of the Amazon page

> MPU-9250, BMP280, and fan speed controller.

See:

https://github.com/cyoung/stratux/wiki/All-About-AHRS

https://github.com/cyoung/stratux/wiki/Cooling-fan-speed-control

I heard that plugging a fan directly to the gpio without a regulator is non advisable. There are small controllers that you can use alternatively.

https://mini-mods.com/2018/12/29/setup-your-retroflag-megapi-case-with-fan-control-board/

or

https://www.amazon.com/Stratux-Sensors-Controller-Raspberry-MPU9250/dp/B06ZZCHBHT/ref=sr_1_3?keywords=raspberry+pi+fan+controller&qid=1555566417&s=electronics&sr=1-3

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Also you could try screwing the fan on tighter or looser. Or maybe shaving some plastic off of the center so that it doesn't get compressed. but not so much that the fans scrape.

Stratux "AHRS" is a software implementation based on combining GPS data (of certain supported GPS sources, not all) and "gyro" data from add-on optional chipsets installed to your build.

What MPU unit are using for your gyro data? Often the MPU has a companion BMP unit that supplies the baro data. I expect that STRATUX will not know about the BARO data on your Ipad. Whatever EFb app you use on the Ipad might be able to access the Ipad baro.

The unit below is a common way of getting MPU (for ahrs) and BMP (for baro). It also has the fan controller included:
https://www.amazon.com/gp/product/B06ZZCHBHT/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1

https://www.amazon.com/dp/B06ZZCHBHT/ref=cm_sw_r_cp_awdb_V8XUzb4JGHWRC

I just got one from Amazon. They appear to be back in stock. Stratux AHRS Sensors and Fan Controller / Raspberry Pi MPU9250+BMP280 https://www.amazon.com/dp/B06ZZCHBHT/ref=cm_sw_r_cp_apip_7RpFzoyjBNMPq

Awesome. That's all I want! I assume when https://www.amazon.com/Stratux-Sensors-Controller-Raspberry-MPU9250/dp/B06ZZCHBHT/ref=sr_1_35?ie=UTF8&qid=1493845954&sr=8-35&keywords=stratux is available I will be able to run the beta software with it.

For someone new to this whole thing, I assume the installation of the AHRS sensor will be easy enough? Do I require an external GPS to use the AHRS hardware? I have an iPad with LTE, so it has the internal GPS.

Thanks again for answering my questions. All I have to give in return are upvotes, but I will definitely be a new Stratux customer imminently!

does this unit (https://www.amazon.com/Stratux-Sensors-Controller-Raspberry-MPU9250/dp/B06ZZCHBHT/ref=sr_1_3?ie=UTF8&qid=1496870371&sr=8-3&keywords=stratux) use gps for ahrs or is it a true ahrs sensor?

Here you go. I am sure there are other options but I believe this is the one they are using to develop AHRS right now. https://www.amazon.com/dp/B06ZZCHBHT/ref=cm_sw_r_cp_ep_dp_Ikgozb8SFGXTT

Just ordered this https://www.amazon.com/dp/B06ZZCHBHT/ref=cm_sw_r_cp_ep_dp_855ezb9PA606E hopefully IFly will support synthetic vision soon
Thanks