What's new

bobbydilley

Professional
Joined
Apr 29, 2018
Messages
407
Reaction score
315
Location
England
OpenJVS Hat Update - 11th January 2021

Hope everyones doing well, @RedOne and I are almost ready to send the boards off to the manufacturers however we've got one small issue that we'd like to gauge everyone's thoughts on first.

We are proposing that the OpenJVS Hat will ONLY support a Raspberry Pi 4 from factory.

Due to hardware restrictions of the older Raspberry Pis, an issue arises where if JVS communication is sent while the Pi is starting up it forces the Pi into it's bootloader mode where it will get stuck and won't successfully start up. Because of this, we will manufacturer the boards to only support a Raspberry Pi 4 from factory, which has multiple serial connections allowing us to use one that isn't involved in the Pi's bootup process.

Currently the ability to swap compatibility to support a Raspberry Pi 2 or 3 will require desoldering and soldering a small part (0 Ohm SMD resistor) of the board and a configuration change in the OpenJVS software. This means basic soldering equipment and skill will be required, if you'd like to make the board work with an older version of the Raspberry Pi. It is worth noting that in this compatability mode, any on board bluetooth capabilities of the Raspberry Pi will not function.

An alternative is to add easy to use jumpers on the board to facilitate this compability swap, however this would put the board cost up and add to components that may eventually fail with corrosion of the jumper surface. This would also add an extra potential problem with troubleshooting.

What is everyones thoughs on this? Do you accept that it will only work with a Raspberry Pi 4 from factory and that solering is required to swap to compability mode, or would you prefer the board cost to be higher and include jumpers?

Once we've got this sorted out I will send a Google form to everyone with the final price and those who are still interested can fill in their shipping details.

Looking forward to hearing everyones thoughts on this,

Bobby & RedOne
 

rtw

Champion
Joined
Sep 28, 2015
Messages
1,276
Reaction score
1,265
Location
Norway
I am not that happy with the RPI4, it has a tendency of running warm and putting a HAT on it will most likely obstruct the cooling fins ?

If you need the PI to boot fully before enabling JVS why don't you use a GPIO to enable the RS485 transceiver or line ?

edit:
With an explicit enable this makes the whole design more future proof and there is no need to desolder anything.
 
Last edited:

popinadam

Beginner
Joined
Feb 16, 2017
Messages
21
Reaction score
7
Location
California
OpenJVS Hat Update - 11th January 2021

Hope everyones doing well, @RedOne and I are almost ready to send the boards off to the manufacturers however we've got one small issue that we'd like to gauge everyone's thoughts on first.

We are proposing that the OpenJVS Hat will ONLY support a Raspberry Pi 4 from factory.

Due to hardware restrictions of the older Raspberry Pis, an issue arises where if JVS communication is sent while the Pi is starting up it forces the Pi into it's bootloader mode where it will get stuck and won't successfully start up. Because of this, we will manufacturer the boards to only support a Raspberry Pi 4 from factory, which has multiple serial connections allowing us to use one that isn't involved in the Pi's bootup process.

Currently the ability to swap compatibility to support a Raspberry Pi 2 or 3 will require desoldering and soldering a small part (0 Ohm SMD resistor) of the board and a configuration change in the OpenJVS software. This means basic soldering equipment and skill will be required, if you'd like to make the board work with an older version of the Raspberry Pi. It is worth noting that in this compatability mode, any on board bluetooth capabilities of the Raspberry Pi will not function.

An alternative is to add easy to use jumpers on the board to facilitate this compability swap, however this would put the board cost up and add to components that may eventually fail with corrosion of the jumper surface. This would also add an extra potential problem with troubleshooting.

What is everyones thoughs on this? Do you accept that it will only work with a Raspberry Pi 4 from factory and that solering is required to swap to compability mode, or would you prefer the board cost to be higher and include jumpers?

Once we've got this sorted out I will send a Google form to everyone with the final price and those who are still interested can fill in their shipping details.

Looking forward to hearing everyones thoughts on this,

Bobby & RedOne
How much extra cost are we talking for the board cost and the jumpers? I'm personally fine with only pi4 compatibility but if it's not a ton more overall then it would be nice to have that option.
 

Robjab

New User
Joined
Jan 16, 2021
Messages
4
Reaction score
1
Location
United Kingdom
Just found this and read through every post. Congratulations on such a great project and all the progress made! Very interested in the final outcome and product. I personally have RPI3's but would happily purchase and mod if needed. Many thanks
 

bobbydilley

Professional
Joined
Apr 29, 2018
Messages
407
Reaction score
315
Location
England
Thanks for the kind words @Robjab - we've emailed the manufacturers and so are waiting on a quote for the hats. Will update everyone when they're ready!
 
Top