Long distance power & data transmission

OpenMV related project discussion.
aherbets
Posts: 2
Joined: Thu Jun 15, 2017 3:23 pm

Long distance power & data transmission

Postby aherbets » Thu Jun 15, 2017 3:27 pm

I'm looking to power (and transmit data to and from) the cam from distances greater than 50 ft. How can I best boost the UART/USB/SPI to RS-485 levels? Or is there another better way to go about this?

I've found a few things that may help. Curious as to what anyone thinks in terms of which may work best.

1) USB to RS-485
http://www.robotshop.com/en/devantech-u ... rface.html

2) UART to RS-485
http://www.robotshop.com/en/sfe-uart-to ... erter.html

3) PoE possibly? The original idea for the project was to make the camera PoE-enabled, but to be honest I'm struggling mightily to accomplish this. I've had a few ideas, like using a PoE Network switch and then mounting an ethernet port on the board, but I'm not an experienced prototyper and don't know how I'd do this.
User avatar
iabdalkader
Posts: 403
Joined: Sun May 24, 2015 3:53 pm

Re: Long distance power & data transmission

Postby iabdalkader » Thu Jun 15, 2017 3:42 pm

I think CAN easily works over this distance and at 1 Mbit/s. For PC/host side data you could use a USB to CAN like this:

https://www.seeedstudio.com/USB-CAN-Ana ... -2888.html
aherbets
Posts: 2
Joined: Thu Jun 15, 2017 3:23 pm

Re: Long distance power & data transmission

Postby aherbets » Thu Jun 15, 2017 4:06 pm

Will this take care of transferring power from the computer to the cam as well?
User avatar
iabdalkader
Posts: 403
Joined: Sun May 24, 2015 3:53 pm

Re: Long distance power & data transmission

Postby iabdalkader » Thu Jun 15, 2017 4:45 pm

aherbets wrote:
Thu Jun 15, 2017 4:06 pm
Will this take care of transferring power from the computer to the cam as well?
No, just CAN high/low and GND you still need to provide power (could hack it to find the 5V) and a transceiver chip or diodes on the cam end. This is similar to your solution, but I think it's more reliable for longer distances and supports many nodes on the same network if you need that.

Return to “Project Discussion”

Who is online

Users browsing this forum: No registered users and 2 guests