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That's about 5ppm out, not bad for standard quartz crystals (which are usually rated +/- 20, 30 or 50ppm). What accuracy do you need?

CMOS latchup is common in this sort of situation (phantom powering).

Generate all the harmonics under 22kHz and sum them? Easy, not efficient...

Internally compilers will use hashtables for lots of things like names, constants and identifiers, so any arbitrary ordering could be down to the hash function on the day. Also optimization passes might order things by expected usage too...

For speed and for their saturating arithmetic...

Which begs the question what key release velocity is a note-on zero-velocity packet equivalent to?

If I remember rightly triangle isn't bandlimited, but has much lower spurious tone levels as its not a discontinuous waveform (rather its derivative is discontinuous).

A note off message is equivalent to a note-on with zero velocity - you should always treat them identically (in an ideal world). What I'm not clear about is if the velocity value in a note-off message has any meaning...

Next to the ADC where you want the interference to be minimized.

SDcard pull heavy currents when writing and erasing, unless you have separate regulation for ADC and SDcard this will cause noise spikes on the ADC readings - adding lots of bulk capacitance can help (millifarads, not microfarads) by attenuating the voltage spikes.

Can you adding debugging output then?

Can you snoop the traffic?

BTW 0.24ms latency is 8cm in air, which seems to be overkill really.

You are wiring TX <-> RX in both directions?

Single LiFePO4 cell is 3.3V or so, although somewhat higher fully charged...

Is the flight controller 3.3V ? It needs to be to talk to the T4, otherwise it'll roast it.

Doesn't the datasheet show the signal paths?

Nearby mobile phone? Are you using an SD card on the Teensy?

The pciture shows the ground wire is not running alongside the other wires, so there's a whole heap of loop inductance that you don't want there. Every signal line should run alongside a ground return wire, ideally a return ground wire per signal wire. Keeping the ground apart from the signal...

Normally they top out at 1.35V each.

Try 4 NiMH rechargable AA batteries (about 5.3V), which should have better high current handling. 3 x alkaline AA is only 4.5V and thus much closer to undervoltage cutoff, and the max current is less than with good NiMH cells. 1000uF is not going to help a continuous overload much. 8 ohm...

Well with only one active node the packet's don't get ACK'd and the single node will eventully fall into passive error mode if it sends packets regularly?

Post your code? A couple of snippets aren't enough... BTW a line input will low pass filter a guitar output as guitars want 1M input impedance typically.

How hot is it getting with these continual erases?

The cap will be reducing the level of noise - you don't need to slow down the edge (in fact the standard solution is normally a 74HC14 which has proper amounts of hysteresis, much less noise sensitive then). The noteworthy fact is that a CMOS logic input held at about 1/2 the rail voltage...

WD40 is not safe for many plastics, I would not risk it on electronics. Air-dusters or electrical contact cleaner are perhaps safer choices?

Just that 100nF is commonly stocked for decoupling caps by many, 10nF would be plenty too.

100k : (100k || 100nF). divider would be me choice, half the LiPo voltage to about 2V, 30uA drain.

Perhaps the better question is what are you trying to actually do?

Just do digitalWrite(pin, HIGH); pinMode(pin, OUTPUT); It unlikely to matter that a weak pullup got enabled a microsecond or so before the pinMode() call?

Well that's an oscillator by definition, the system integrates the control input, which is the integral of the error (if only an I term), so 180 phase shift added to the negative feedback turning it to positive feedback... P term does the bulk of the work, I term exists only to drive the error...

Its oscillating, so the I term is likely too large, and possibly the gain term too (P). Are you using the D term?

I'll repeat those pink bags don't shield from ESD, they just don't generate much static when handled (compared to raw polythene etc). The silver/grey bags are Faraday cages, but non-shorting (the ultra-thin aluminium layer is sandwiched), so they are safe touching powered-up circuits (Unlike...

I'd suggest using 1000+ ohm ferrite, and say 10 ohm resistor, then the mic can have less supply droop and good filtering?

Indeed the headphone socket is only for headphones/earbuds, not for outgoing signals.

Something like this: The source sees about 120 ohms, but centre-biased, so that at 3.3V supply it only has to drive about +/-12mA, not 25mA This terminates the line well enough that reflections are not a problem. Its an old trick that saves current and power too of course, constant 20mW...

That's a good point! I guess a raw TCP/IP connection is the closest match...

IIRC updates are triggered by the first input or output class that initializes, such classes have synchronous I2S interrupts typically. Every buffer full of samples the class triggers a software interrupt on leaving its ISR I think. This then calls all the update() methods in the network of...

SLIP? PPP? certainly are serial protocols, its a question of whether they are easily supported by Windows. https://en.wikipedia.org/wiki/Serial_Line_Internet_Protocol

Ceramic MLCC 100nF caps are pretty standard, they have low inductance. Surface mount are best if you can manage it (1206 aren't hard to solder really). Keep them close to the supply pin of the chip they serve (within a few mm) for a reliable board. At the speeds these chips switch even 20mm...

And don't use opamps as comparators (they are awful at it), the LM339 and similar are very cheap and do a far better job and have open-collector outputs to make interfacing to logic very easy and safe. They are likely to switch fast enough not to cause multiple transitions too, which the LM358...

ote that a 74LVC245 run at 3.3V may have 5V tolerant inputs, but it cannot drive both directions with a voltage shift, that takes a proper bidirectional level shifter. 5V will destroy a T4, you have been warned.

A 1N4148 diode could be the way to pull the active-low EN down safely?

30cm? 50cm? You can pull various tricks for longer distances over cables, like series resistors to reduce overshoot and the risk of reflections, but I2S is pretty vulnerable due to most of the signals being clocks (double-clocking due to waveform distortion is a common issue). Good...

Code protected inside a __disable_irq()/__enable_irq() bracket is called a critical section - datastructures shared with an ISR must be handled with critical sections, its quite simple. Then the ISR and the critical sections get serialized atomically without interfering with each other...

Indeed pink is not protective, merely dissipative, the shiny metallic looking bags are a hard requirement for anti-static packaging. Someone is misinformed I suspect. https://en.wikipedia.org/wiki/Antistatic_bag

That sort of low level interrupt stuff will be because there is an associated DMA completion interrupt which swaps buffers over.

Typical signal diodes have reverse leakages measured in nanoamps, its perfectly OK to use them. High voltage is a very different environment where leakage power can be significant, but 1nA at 2V is not going to damage anything.

The Sitara appears to be for industrial use, no I2S at all on a quick search of the datasheet... Not clear if there's another peripheral that could substitute for I2S. The LS1012 is around 1W, the LS1046 is much more and requires heatsink and fan which is an issue!! I think the imXRT1062...

8.3 filenames are uppercase only, maybe that's it?