Input for ColorLight 5A-75B/E, by rewiring pin 1 of buffers to GND and powering with 3.3v? about chubby75 HOT 5 OPEN

It is worth to mention that the buffers (74HC245T) are not 5 V tolerant either when driving, so the peripherals should be also driven by 3.3 Volts in this case. A slightly less intervening method to convert the board, whilst being able to use 5 Volt inputs is to run the board from 3.3 Volt and replacing the buffers with 74LVS245. In this case you don't have tow rewire / cut the VCC to each chip you replace, making damages less likely to happen. You only have to cut the trace to the direction pin and rewire that to GND.

from chubby75.

The readme currently suggests to replace the buffer boards instead, but I wanted to suggest just physically rewiring pin 1 as a simpler solution (which requires less soldering and doesn't require buying a new chip).

from chubby75.

I just wanted to note the downside of my suggestion is that once pin 1 has been physically rewired, it would be difficult to go back. Hypothetically one could instead rewire the pin to a physical switch. Or could even wire to an output pin from another output-only buffer, to allow that one wire to be selectively reconfigured by writing to that output pin.

from chubby75.

Yes, this should work. However as you said the FPGA is certainly not 5V tolerant and i don't know if the entire board will work when powered with 3,3V (not familiar with this buck converter stuff).

from chubby75.

Read here https://twitter.com/claude1079/status/1231194849350647808?lang=en

from chubby75.