#21

I would also be interested in the board and necessary parts if you are ordering

#22

Great, thanks for the confirmation! On the picture above it does not look as if modifying the teletype would be more elaborate than building the bus board.
I will contemplate about it a bit since I already have the old bus board. On the other hand the board is cheap enough to enjoy the extra i2c connectorsā€¦

#23

ok, iā€™ve had an even better idea for a potentially more elegant solution.

TT is (wonderfully) only one board. the i2c ā€œbus boardā€ could be a thin mezzanine, that connects to both the power jack (with a 5x2 female connector) and the i2c jack (with a 3x2 female connector).

there would then be a load of 3x2 male connectors on the back for i2c, and a male power connector (so there wonā€™t need to be redundant cabling.) the extra regulator and resistors can be hidden on the board. all in all it should be an elegant (and cheap) solution.

of course, iā€™ve already ordered some of yesterdayā€™s version and that will also be totally fine. so iā€™ll only make time to draw up this new version if there are other people interested.

12 Likes
#24

Definitely interested. Hoping this ecosystem expands wonderfully and I want a to welcome all my potential new friends.

1 Like
#25

Oh, I just ordered the original new bus board PCB - I did not really understand the idea of the new one, technically it does not make any difference, does it?

#26

cough

:stuck_out_tongue:

3 Likes
#27

Also interested in the mezzanine solution, as in addition to solving the ā€œpull-up situationā€ & providing more i2c connectors it also seems to be a more mechanically sturdy solution than the small bus board PCB.

#28

I dont have any trilogy module so iā€™ll only have 1 txO connected to my TT. Will this still be a problem for me?

#29

@sam haha, whoa that is embarrassing. i need to improve my reading comprehension skills.

@Leverkusen it will do the exact same thing. this is simply ergonomics.

1 Like
#30

In terms of the ergonomics, I found trying to get 3 modules connected to TT and the previous I2C board tricky enough with my current set of I2C cables.Iā€™m wondering if the bus board would be better than a mezzanine solution? Of course, I could also just make myself some longer cables.

1 Like
#31

I actually think the ideal is to have both designs available. The best very much depends on the design of the case.

Itā€™s also important to emphasise that whichever solution you choose, beware of short circuits.

1 Like
#32

Yes, dummies on the not used males could be smart - would be a bummer when it falls off the tt in a portable case and then touches the power distributionā€¦:zap:

Thatā€™s the good thing about ribbon cables!

#33

So, I ordered a v1 bus board just a bit ago. Sounds like the limit for that is 4 devices?

If I wanted to use 2 Ansibles (1 for grid, 1 for arc), a White Whale, a TXo and a TXi, do I need the v2 bus board? I suppose I might add Earthsea at some point as well, oh, and Just Friends, almost forgot about thatā€¦

Definitely interested in the v2 bus board!

#34

Iā€™m wondering if you could connect the mk1 board to the mk2?

1 Like
#35

ok-- i think this will be the ā€œfinalā€ teletype ii expander. connects directly to the back of the TT. 12 headers. power pass-through. i2c pullups set at 2.2k, bringing total i2c pullup resistance to 1.8k. notched for access to reset switch (if youā€™re programming the firmware and added the switch, that is)

the regulator and resistors are in the middle of the sandwich:

Order from OSH Park

$15 for 3. i just ordered a batch for testing.

here are the source files: tt-i2c-v3.zip (18.7 KB)

4 Likes
#36

of course, now that iā€™ve ordered, it seems like this board should have the i2c connectors rotated to 90 degrees so cables escape vertically, not stacking up in layers horizontally. opinions?

#37

Iā€™m having a hard time imagining the orientation of the board relative to the teletype because Iā€™m not looking at the back of my teletype right now. But it would be nice if the cables were oriented the same way on all devices, with the ground in a consistent position. (Though I believe Ansible is the odd one out on the position of ground if I remember correctly?)

#38

thatā€™s a good point. perhaps each row could be a different direction. i find a single fold tends to make routing easierā€¦

#39

@tehn - thanks for putting these together. Iā€™ve ordered a set of each from OshPark to test out. Both look great - Iā€™m excited to experiment with them. :slight_smile:

#40

Just adding myself to the list of interested people. I donā€™t need this white yet, but once the txo/txi are ready Iā€™ll be up to 5 modules on my tt.

1 Like