MarkT's latest activity

The OctoWS2811 Adaptor uses a 74HCT buffer so its 3 volt compatible - so long as Vin is 5V you should be good. Unless the LEDs overload your supply perhaps?

First one working

Write a loop that toggles all the pins slowly enough to check with a multimeter perhaps? Maybe someone already has something like this.

Lower quality LED strips might have less adequate decoupling? Or have counterfeit chips?

Disable interrupts around the assignment sequence. This is called a "critical section" in the literature.

Firstly if the capacitors are type-II ceramic they will add distortion that's very measurable across a wide range of levels, this is cured by changing to type-I ceramic or plastic-film caps. Resistors should be thin-film, not thick-film for...

Yes that is correct its meant to be wired point-to-point. The fact you ran it for a while on phantom power may have caused damage. If you look at the schematic for the Audio adapter: https://www.pjrc.com/store/teensy3_audio.html you'll see it...

And you would tap an existing incompatible screwthread? Which might be larger? And not wrench the insert out of the plastic in the process?

No, they have metal nuts moulded inside them - read the datasheet!

There is no separation of digital and analog supplies/ground on the Audio adapter, and the SGTL5000 isn't high-end.

I note that pin 14 is the first one that's an analog input, possibly why its different from 12 & 13. Not sure why you want to use direct register manipulation on it when digitalWrite / digitalWriteFast will both work and be readable and...

You are seeing beating between the 110Hz and 1000Hz frequencies I suspect. Perhaps reset the PWM counter everytime the modulation waveform turns on? Not sure if there is a way to do this from library calls though.

Do you mean microsecond? A resolution of 17 nanoseconds makes no sense at all in the physical world - even at 2000rpm your motor would rotate less than a second of arc in 17 nanoseconds. Steppers have angular errors of a degree or so at the...

Nope, absolutely required if you're going to bomb out of a tight loop like that on the first state change. Code exceutes way faster than the mechanical world - for each instruction the T4 executes a jet plane might fly about one wavelength of...

I meant work as a speaker, rather than a wisperer! Most old transistor radios that could put out a decent level were 6V or 9V, with the whole box as speaker enclosure. Its 8 ohm, not 4 ohm, so it wants some volts, it can't get to its rated...

It would work better from a 5V microcontroller I suspect, 3.3V isn't much to deal with, especially with a tiny little speaker like that. Small speakers have restricted frequency range due to being small, especially if in a tiny enclosure like that.

Carbon mics require a bias voltage - so the bias on the Audio adaptor (for an electret mic) ought to produce some output. I suspect its very low compared to what the mic is designed for. Carbon mics are awful BTW, use an electret instead is my...

Would bypasspin be connected to a button perhaps? If so you've not debounced it so I'll expect Bypass to often drop out immediately due to bounces.

Your SPI bus wires should be tightly bundled in parallel with at least one ground wire, you have a lot of stray inductance with the rats' nest wires, and they act as magnetic antennas to stray RF... Use much shorter wires (I cut wires from...

Which SPI modes are you using at each end?

Firstly you shouldn't be calling delay in an ISR, it locks up the processor! Also its a bad idea to use Serial object in an ISR, serial relies on other interrupts to work. Secondly the ISR is potentially called on every bounce - you can't stop...

Rosin flux is not corrosive. Plumbers flux is very corrosive, some poor folks learn this the hard way!