Thanks for the reply, but I need to clarify things. The Raspberry Pi
would be a replacement for the Arduino, as (1) FPC certainly runs on it
and (2) I have one already, But I think it would be overkill and that
the Arduino board would use less power.
So the question remains what Arduino board would be best supported by
FreePascal, with the requirements mentioned below (which by the way is a
star tracker for astro photography).
Regards,
Adriaan van Os
Raspberry pie just runs a version of linux, so FPC should work just
fine on any raspberry pie. They certainly can be run from a
powerbank, I've done it with one of mine multiple times. I haven't
found a way to determine how long the powerbank is going to last, so
you'll need to figure out how to do that, or just be prepared for
everything to stop when the power runs out.
As for talking to the arduino from linux (the raspberry pie), I
haven't tried that myself, but I don't expect it to be any different
from when using windows for the host os.
Unfortunately, I don't know what resources for programming arduino
boards exist for linux, but it can't be too terribly different from
windows, but I've not specifically looked for linux versions of the
various serial and/or other communications libraries you'd need to
talk to the arduino, but as long as you can port or locate versions
for linux, you shouldn't have any trouble with it.
Now you're making me want to experiment. I never had a need to talk
to an arduino from linux, even though I use it regularly, I normally
build projects to talk to windows, because that's what most folks I'm
building things for use. This might be a fun project all by itself.
On 9/11/2026 5:56 AM, Adriaan van Os via fpc-pascal wrote:
Maybe someone could advise me as to what Arduino hardware is best
supported by FreePascal. My project has the following requirements
1. Read an absolute rotary encoder (SSI data: Line-driver RS422
Diagnostic outputs push-pull)
2. Communicate with a closed-loop stepper motor driver (TMC2209 with
ESP32-S3, connectivity CAN, Serial, Wi-Fi, BLE, USB, Qwiic and GPIO)
3. Communicate with an Intel MacBook. Over Wifi, Bluetooth, USB or
ethernet ?
Of course, less cables is better, but not a requirement.
I already have a Raspberry Pi, but the application must be used in
the field, where there is no 220V, just a 12V or 5V powerbank.
Thanks,
Adriaan van Os
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