1
$\begingroup$

I would like to make a 24 V (3D printer board and shield) setup, as opposed to the usual 12 V, and to do so I had been considering using the Taurino Power board, or the clone Eruduino. However, I just found this board:

Re-ARM microcontroller, with SD card slot

The specifications state a DC input of up to 36 V:

Specifications

Does anyone know whether that really means it can handle 24 V in the same manner as the Taurino/Eruduino? If so, then that looks like a double win: not only 24 V support, but also a faster processor. Anyone have experience with this board?

I was thinking of using with a RAMPS1.6 Plus (maybe), or just a regular RAMPS 1.4 (hacked to support 24 V). I'm just shopping about, and I thought that if I was going to spend £14 on an Eruduino, then I just as well spend that money on something better.

It does work with Marlin apparently, as some of the customer reviews would suggest, but none of the reviews that I could find referred to a 24 V setup (heated bed etc.), hence my question.

| improve this question | |
$\endgroup$
4
$\begingroup$

Given that the capacitor near the input is quite clearly marked 35 V, a 36 V rating seems questionable.

The (buck) regulator used on the (genuine version of the) board is the AOZ1282CI which supports up to 36 V input. This is probably where they got the 36 V rating from, but obviously the 35 V-rated capacitors drop the input voltage down below this.

Schematics for the board are available on the RepRap wiki and show that the input voltage only feeds into the regulator. I see no reason why this board couldn't handle 24 V input, as this is well within the rating of both the regulator and the capacitors.

| improve this answer | |
$\endgroup$
  • $\begingroup$ Ah, well spotted! $\endgroup$ – Greenonline♦ Jul 15 '19 at 9:29
2
$\begingroup$

For completion, I've just seen this, Can a ramps 1.6 support 24v? (which basically confirms the 24 V support of the Re-ARM board) although it isn't particularly useful w.r.t. the RAMPS 1.6 side of things, although I would imagine the the 24 V RAMPS hack would still apply.

In addition, Alex Kenis does a great review, and he has successfully tried it with 24 V, watch 32-bit series part 4: Re-ARM board "review?". Whilst the RE-ARm offers a lot of advantages, some of the main down points to be aware of are:

  • No 5 V analogue inputs, they are 3.3 V, so the endstops use 3V3 logic (not a problem from mechanical switches, but 5 V optical endstops will have a problem
  • Some of the pins of the Mega are missing from the Re-ARM.
| improve this answer | |
$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.