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Paul,

I have a recording console from the late 80s that uses eurocard backpane connectors. Its was based on a z80 and follows that standard. I have attached the connector detail schematic for the...

So my project is nearing rev2 - hopefuly the last prototype. Thankfuly all issues have been ironed out with REV1.0 pcb...

I have a load of WS2812 inside the main unit, and I break out to another...

video showing the prototype with paper and window tint film....

https://www.youtube.com/shorts/AxZwknXfylM

So far my prototype uses a sheet of paper to diffuse the WS2812s, and a sheet of car window tint. Works really well and the OLEDs look great through the tint. SO the thinking is to use acrylic with...

The front panel will be black tint transparent. for initial prototypes I will use an acrylic. Its hard to tell from the pcb render, but there are also OLED screens..... The body will likely be formed...

Today I ordered the first batch of PCBs for my project "The Machine".
It is a sequencer unlike any other. Until I have proper videos made to explain it, I have just made public my development...

brilliant, thanks Paul!

To continue this line of thought, I am using the redundant RX pin for my IRQ. Are there any tricks I could use to maybe send a serial ID value to interrupt line so the main...

@BriComp - no I dont want to use the UART. The question is about how WS2812 functions - whether or not it engages UART as it has to run on one of the hardware serial ports..... I want to know if the...

@defragster - yes the irq pin it needs to be read as an input. How about this based on your suggestion:




#define SUB_PROCESSOR_IRQ 34 // RX8 //...

bueller......

Thanks Paul, that gets me on the path.... lcsc good as I will use jlcpcb anyway ;)

I really should stop posting late at night...

My question was a bit vague at best...

Yes I know this connector is not a hub and I do realise I am going to need some extra hardware to do this....

In this thread https://forum.pjrc.com/threads/64122-Connecting-a-USB-active-HUB-to-the-Teensy-4-1 paul says yes, you can use a hub on the usb host....

Because I would like to hook up a midi...

main hardware:
T4.1
arduino nano v3
WS2812 - lots of them.....
ADUM1201ARZ-RL7 logic level shifter

Im using https://github.com/PaulStoffregen/WS2812Serial library, works great.

I am using...

AHA! got it. I was thinking the volume was set by the SGTL5000, but I see now the Audioboard is just holding a pot and connecting the wiper back to the t4.1 for processing..... How did I not see...

Paul, I think I see, so the volume change is achived by changing the AGND in some way? Im a bit lost in the analogue side, much more of a programmer but keen to know more about how this works.....

Well looking at the schematic:
https://www.pjrc.com/store/teensy3_audio.html
29752

pin 15 goes past a cap into a pot then via a solder bridge (default to GND) to the "ADDR" line (pin 31) on the...

im thinking the pin 15 connection to the teensy being analogue, is going to allow the teensy to digitally set the volume. Before I wade into the library, I thought I would ask. I doubt I want to use...

Teensy 4.1
Audio board Rev D

I am designing a board with option to add the rev D audioboard, however I am pin limited.

I dont need the SD card or the memory expansion, so I have omited those...

In the attached screen shot below, you can see the top two rows of 14 pins are the main sockets for the audio board to sit over. the lower set of paired pins are for the teensy. On the left are some...

Im designing a PCB to mount a t4.1 and an audio board rev d side by side. I have dealt with all the ground traces for line in / out and the headphones etc. Question is, I note the photos of the board...

ok yes that is what I was thinking. I intend to commnicate between the two teensy. Are there issues connecting pins if they are powered separately?

I am working on a project that now requires two or more teensy 4.1.

I have not yet decided on how to communicate between them. Serial UART or i2c maybe... My question is about power. 3v3.....
...

Thanks Luni, thats some reading for me!

just mulling some ideas I have...

I am thinking of a design that uses two teensy 4.1 boards. Is it possible to use one teensy as master for USB upload from arduino, and have the master flash code...

As part of my soon to be revealed project, I am working on a circuit that offers both 5 pin DIN MIDI and 3.5mm TRS jack conectors. I have a load of TRS switching jacks which are readily available....

well i sorted it by reinstalling teensyduino and removing all the other instances of SD and SDFat. guess I will have to reinstall these libs if I use a nano etc.....

So I decided to have a look at Arduino ide 2. I checked to see if I could run the new version 2 alongside my original Arduino (1.8.15) Teensyduino 1.54 - results said yes and that my libraries would...

Thanks for the help, got it running now.

Here is a working example sketch:


/*
example sketch to drive up to 1 + 8 monochome OLED displays using a TCA9548A i2c MUX

display on wire 0...

I have declarations for multiple OLED displays running via an 8 channel i2c Mux:


Adafruit_SSD1306 display1(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire2, OLED_RESET);

Adafruit_SSD1306...

Apologies for bumping a thread from 2018, but I suspect i am experiencing a similar problem. Was a solution ever found? Right now I have fixed a crash that was happening very quickly during runtime....

t4.1

I am developing a midi sequencer. At present its timer is based on a couple of counters. the first counter measures the steps in each pattern, and the second increments on each round of the...

@MarkT Thanks for the advice, how does this look?

26757

I was thinking if two diodes to just keep the line from being driven in reverse as I have patch points everywhere to modify the...

I have the following circuit block:

26751

I am building a prototyping board that allows me allot of options. I may be skipping this part of the circuit and driving AAT-REQ-5V or ATT-REQ-3.3V...

I keep running into dead ends on this. Im thiking I will be moving midi over the serial lines from the t4.1 to the mega and back. Now I wonder if I go with opto isolators as you would with a midi...

I want to link a teensy 4.1 to an arduino mega 2560 R3.

What is the best way to hook these two together to exchange data? Serial? a parallel bus? SPI etc? Are there any libraries available to...

found it:
https://forum.pjrc.com/threads/25549-What-is-the-difference-between-the-74HCT245-and-sparkfun-s-logic-level-converter



I suppose in this case Paul is talking about using it in one...

I still havent found the post where paul explains more, but here is somthing:

https://forum.pjrc.com/threads/68108-WS2812E-teensy4-1-logic-level-shifting?p=287739#post287739

I am working on a project to replace a z80 based controller board on a large studio mixing console.

I have a fully functioning replacement using an arduino mega2560 rev 3. Now I move to building a...

yep its seems to be passing data through now. BRD is already taken are of. the motherboard select bits set all the trancievers to active and the chip select line decoder ICs1 and 5.

Nice console!...

thanks for the advice Foxhood. In reference to your query if the pin mode was set correctly, I was running a check within my write function to determine if it was in read mode. You will note the...

What console do you have? Im working on a Soundtracs Eric, its quite a beast.

well I think I may have found a solution.

reading this thread using answer #4 from Fungus, this seems to allow me to pass data through this 74LS245

here is my modified function to put data on...

Thats correct. I have removed motherboard id 3 for my bench testing. The jumpers set the address and IC2 is a comparater. writeBoardAddress() does exactly that and works fine.



yes conn 2 is...

I just double checked the board. The line showing pin 19 connected to the common of the resistor package is an error. It is only connected to pin 19 on IC2, 18 IC1 and IC5 19 The is the motherboard...

yes there are some ommisions in the schematic. I have spent weeks noting the circuit and tracing lines. Pin one is connected to RD, and when the motherboard is selected, the OE pin (19) is pulled low...

I should make it clear: I can see the voltage change HIGH / LOW on the a side (a0 - a7) of the LS245 which is connected to the mega. The b side (b0-b7) is allways HIGH - dont forget the 22k pullup...

The OE is LOW, and the DIR pin is HIGH.

Schematic for the motherboard is here:

https://drive.google.com/file/d/1qv4...ew?usp=sharing

I am connecting at conn 4 top right. The LS245 in...

OK, start at the start....

I have a mixing console that was built in the 80s and uses a z80 to control switching of audio routing, leds and detect button presses.

The console consists of 7...

correct:



digitalWrite(ADDR[0], ((j & 0x01) ? HIGH : LOW)); // bit-fiddle to set the i-th pin to HIGH IFF binary version of j
digitalWrite(ADDR[1], ((j & 0x02) ? HIGH :...