I'm none of those so here goes.
Code reads a (green) Led pin as if an antenna picking up stray garbage looking for a trigger, and if we get one then code does some PinMode shuffling, say pulling one end of the Led low...
Ok, mockup completed. Along the way noted circuit post #12 shows R118 as 10K, should be 110R.
Don't have any BAT54s so D21/22 are 1 Amp Shottky. R204 and Red Led serve as a visible load. With Input HIGH, Led is...
Just adding, in hindsight should have mentioned in my first reply that 1/8" TRS Midi hardware is on the build bench and although I don't have gear with CV or Gate (yet), a colleague does so the protection is an...
MC74HC1GT04DFT2 has HC family input thresholds so probably won't work with +3.3v input signal. You need to look at 74HCTxxx family.
74HCT04 is a hex inverter and its outputs can source or sink 25Ma.
74HCT00 is a...
How about using a 74HCTxxx for U5, U15 and U16 to buffer and level shift to 5v and power protection circuits with +5v?
Having said that, I think the forward drop of two BAT54s needs to be taken into account and feel...
That's a shame, there's nothing else out there that can do what a BCR does, buggy as they are.
I've read that dodgy power supply caps and solder fail on USB connector can cause trouble. Been around long enough for...
Some BCR communication modes can give you Midi feedback depending on how it's mapped by the host so it might pay to double check which mode the BCR is set for and what the host is trying to do with it.
Sorry about the delay, distracted by other work.
A single NPN pulling something LOW will work as an inverting buffer and the receiving device won't like it.
A PNP transistor pulling HIGH works, tested on a T3.5.
Reporting good news. Upgraded MIO-10's firmware and plugged in a T4.1 as Midix4 with just the blink sketch and IConfig sees 4 ports. YeeHaa, now we're makin' bacon!
I cannot say if upgrading the firmware fixed it or...
From the pic it looks like the Cathode end of the zener is connected to the LC's TX pin and considering that it works as a shunt, the Anode would be connected to Ground.
After thinking on it I must correct myself re...
AFAICT the zener looks like it's intended to protect the Teensy TX pin from any incoming excess voltage via the Midi out port. A 5.6v zener may be appropriate for a +5v board but I think that a 3.6v item is suggested...
Thanks Paul. I2c is driving 6x NeoTrellis so there's some length and inevitable stray C and the Trellis likes pullups at the far end. An LC needed pullups at the board end as well.
Just looking at the same issue here, soldering up a T4.0 and am wondering does it make sense to use the series 100R on any T4x digital output pin in use?
In my case, using SCL,SDA and TX3, the latter being direct...
The usual Fet and two resistor level shifter works well in this situation.
I've found the Mega to be an electrically noisy board and displays can add their share of noise as well. Hooking 'em up to an audio project...
Interesting kit. A quick look at the T4.1 indicates that you could hook up an ILI9341 SPI screen, encoders or whatever and it looks like an excellent starting point. You might consider fitting stackable headers to the...
Based on @oddson's example, chiseled out of a larger project, tidied up and tested. Buttons do Note#, CC# or Toggle CC#.
Hope is helpful for a worthy cause.
/* Works on T3.2, Usb type = Midi
* Based on...
Old codger with advanced soldering iron skills.
Pretty much self-taught Electronics/Automotive/Computer Technician/Hacker/Re-Engineer.
Built an Analog Synth ~1978 pretty much from scratch and life being what it is - what you end up doing whilst being busy with other plans, shelved it.
Forced into isolation by challenging health issues, officially retired and looking for a "mental health" project, dug out the box of remains of the original Synth, caught the bug and currently have a clutch of Roland Synths and other goodies.
To any Hacker worth his salt, off-the-shelf kit don't always give you what you're looking for which is why I'm here...
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