Hi Giuliomoro! Similarly, we have a Bela Mini project and we're simply trying to sequence 5 LEDs using 3.3v Digital outputs using a Pd patch. We have some resistors in series with each LED for good measure but for some reason we can only ever seem to get 4 of the 5 to work concurrently. With that said, we're generally stepping through these one at a time, too, and rarely using them concurrently. Even in that instance, only 4 of 5 work. All the digital outputs appear to be functioning as expected and digital pins are configured as outputs in our patcher. LEDs when tested individually test out fine, as do our resistors. Circuit looks solid. So, we're understandably a bit perplexed and wondering if you have any insights?
What could we be missing? Anything we should try? Photo of patch and circuit attached.