Using Teensy4.0 instead of Teensy3.2

1

I made a large (2’x5’) display using a Teensy3.2 with logic for driving the matrix based on the SmartMatrix 3.0 shield. (I bought one but cloned the logic parts, using TTL DIPS). It worked WELL.

Now I have to use a Teensy4.0 since I have no substitute 3.2s available (and PJRC says we have to wait until 2023 to get them).
How should I proceed? I have the schematic for a 4.0 to 3.2 adapter board, and also the 4.0 SmartMatrix Shield. Which one do you guys think is quickest and easiest? I’ve made converter dongles before (I used wire-wrap…quick and dirty for prototypes), so not a problem going either way, I just don’t know which I should spend my time with.

2

An adapter has been designed that should allow you to directly plug in the T4.0 into the old shield. You can get it fabricated at oshpark.com. Take a look here:
Teensy 4.0 Released - #32 by Louis