mowatm
Posts: 5
Joined: Tue Mar 19, 2019 11:48 am

Wireless display

Tue Mar 19, 2019 11:54 am

I'm doing a project that has a pressure sensor and level sensor and want to display the level and pressure on a display but want to do this wireless and not use internet any ideas.

lewmur
Posts: 368
Joined: Sun Dec 25, 2011 3:20 pm
Contact: Website

Re: Wireless display

Tue Mar 19, 2019 12:49 pm

Not enough info. I'm assuming you are connecting the sensors to a Pi via the GPIO pins and want to "display" the readings remotely. How remote? In the same room? In another country? How many digits? What kind of accuracy? How often? Once an hour? Once every millisecond?

Heater
Posts: 13093
Joined: Tue Jul 17, 2012 3:02 pm

Re: Wireless display

Tue Mar 19, 2019 12:56 pm

zigbee:
https://elelabs.com/products/elelabs_zigbee_shield.html
https://hacks.mozilla.org/2018/02/how-t ... s-gateway/

bluetooth:
https://www.cnet.com/how-to/how-to-setu ... erry-pi-3/

LoRa:
https://www.hackster.io/idreams/getting ... ora-fd69d1

Infrared:
http://www.raspberry-pi-geek.com/Archiv ... -IR-remote

WiFi:
Can be used without going near the internet.

Perhaps if you said more about what it is exactly you want to do we could help better. What range do you need? What environment will it be in? What do you expect to transfer over wireless exactly?

klricks
Posts: 6544
Joined: Sat Jan 12, 2013 3:01 am
Location: Grants Pass, OR, USA
Contact: Website

Re: Wireless display

Tue Mar 19, 2019 1:02 pm

mowatm wrote:
Tue Mar 19, 2019 11:54 am
I'm doing a project that has a pressure sensor and level sensor and want to display the level and pressure on a display but want to do this wireless and not use internet any ideas.
Not clear what you want but per your topic title Google [wireless HDMI] for example: https://www.amazon.com/J-Tech-Digital-W ... ooghydr-20
Unless specified otherwise my response is based on the latest and fully updated Raspbian Buster w/ Desktop OS.

mowatm
Posts: 5
Joined: Tue Mar 19, 2019 11:48 am

Re: Wireless display

Tue Mar 19, 2019 1:18 pm

Not enough info. I'm assuming you are connecting the sensors to a Pi via the GPIO pins and want to "display" the readings remotely. How remote? In the same room? In another country? How many digits? What kind of accuracy? How often? Once an hour? Once every millisecond?

it would be up to 30 meters, to one decimal point and every millisecond

mowatm
Posts: 5
Joined: Tue Mar 19, 2019 11:48 am

Re: Wireless display

Tue Mar 19, 2019 2:02 pm

I am trying to measure pressure and level and have them displayed up to 30 meters away and would like the accuracy to be to one decimal point and i don't want to use WiFi and was thinking Bluetooth but unsure on how to do this

fredoll
Posts: 227
Joined: Thu Jan 10, 2013 10:30 am

Re: Wireless display

Tue Mar 19, 2019 2:16 pm

Why don't you want to use Wifi ?
I think it would be the easiest way.
you could have a pi that get the values from the sensors and another one that would display those values.
a 1 millisecond interval is not feasible anyhow.

Heater
Posts: 13093
Joined: Tue Jul 17, 2012 3:02 pm

Re: Wireless display

Tue Mar 19, 2019 2:18 pm

See this thread where they do just what you want:
viewtopic.php?t=182681

Updating at 1000 times per second is almost certainly not possible.

Why would you need such a high update rate anyway. A display will only refresh 60 times per second and the human brain viewing it will register the updates even more slowly.

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