raspi_rv
Posts: 2
Joined: Tue Oct 22, 2019 3:49 pm

Device to measure angle for input to RPI

Tue Jan 14, 2020 7:22 pm

I am new and tried a few searches but no luck.
I am designing a project that will need to measure the angle of an arm relative to horizontal (can be actual as in level bubble or just relative to the mount)
Think of a window in the ceiling where I want to measure how much it is open. I need it to either be wireless or can be wired into some sort of wireless hub for up to a dozen of these devices. Wireless in this case is probably Bluetooth. Power must be from long life battery.

Do such devices exist?

Thanks
77 years old
First computer 1959. Analog Ferranti Packard


hippy
Posts: 6687
Joined: Fri Sep 09, 2011 10:34 pm
Location: UK

Re: Device to measure angle for input to RPI

Wed Jan 15, 2020 6:20 pm

I would have thought a rotary potentiometer, perhaps with some gearing, might be ideal. Possibly a linear potentiometer attached to some linkage.

A microcontroller with ADC input and some sort of on-chip RF connectivity is probably ideal if you are looking for long battery life. There are many very low-cost options there.

Earlton2
Posts: 65
Joined: Mon May 27, 2013 1:13 am
Location: Tonight it's -28C
Contact: Website

Re: Device to measure angle for input to RPI

Wed Jan 15, 2020 11:05 pm

Inclinometers et al:

https://www.digikey.ca/products/en/sens ... ageSize=25

C$35 ++ over here.

Also used in game controllers so maybe some much cheaper parts are available.

You'll have to go hunt for a low power processor but if it doesn't have Analog in then a NAU7802 is an I2C-ADC.

If it were only to wake up every 30 minutes for the blink of an eye you might get a reasonably long run time from your battery.

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