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Allright. Glad you got it to work.

Regards,
Paul

Since you are soldering on the backside of the Teensy 4.0: you did not accidently short pin 32 [HC-05 enable] to one of the SPI pins 10, 11 or 12?

Regards,
Paul

You stated "The problem is that there is no response from the HC-05". Well, the first thing I would do is to measure whether pins EN and EN7 are actually set HIGH by the digitalWrite's when not...

The board I linked to also has 2 voltage regulators on board. I assume to generate a 3V3 analog and a 3V3 digital power supply.
If you want an easier-to-use board, go for this one. Check out the...

Price versus quality, I think the PCM5102A is the best choice. You can find boards for less than 5 US$. See here.

Regards,
Paul

Found the datasheet of the TL2796: 23855
The controller has an SPI interface for configuring the display and a 16/18/24-bit RGB video interface.
And found some Linux driver stuff on Github as well....

The Alibaba page you linked mentioned "D-IC Built-in D53E6EA8805". Searching for that led me to this panel: Samsung AMS326P01.
Samsung panel datasheet here.
The driver chip is from Magnachip, part#...

I verified your sketch on a T4.1 and with or without the analogRead(randomVar ); line, it shows a serial USB device [COM port].
Did you set Menu > Tools > USB Type to Serial?

Using Arduino 1.8.13...

Generally, for strips having more than 3 DotStar LEDs, you want to power that strip externally. You don't want the propshield board [or the Teensy Vin pin] to supply significant current to DotStar...

Great! [nice demo to show appreciation, haha]
What was the issue in the end? Was it indeed an SH1106 controller on the 1.3" OLED?

Regards,
Paul

Other Dutch resellers like Antratek and Floris always shipped Teensy's to me with a card [but I never ordered a T4.0 from them]

Paul

When searching further about the difference between an SSD1306 and a SH1106, I saw some display pictures looking very similar to your picture in message #4.
Here is such a thread.
And another...

Looks OK to me.
Could it be that your 1.3" OLED has a different controller, like the SH1106? [I see 1.3" OLEDs offered with that SH1106 controller]

Same here with Tinytronics, no card with the Teensy 4.0. But never bothered to call them...
Paul

Allright, no I2C pullups apparently.
So you know what to do I guess? See this post.

Paul

Allright. Now it's time to measure whether pullups are present the I2C lines.
With the display disconnected from the Teensy, measure with an ohm-meter between the SDA pin and GND and between the SCL...

You also may want to try to run at a lower I2C clock frequency:

Adafruit_SSD1306 display(128, 64, &Wire, -1, 400000);

Paul

I would not be surprised if the 1.3" display is on another I2C-address. The zero ohm resistors near the 4 pin connector are differently strapped.
Did you run the I2C scanner example sketch on both...

Hi Bruce, you may consider buying a cheap CANbus analyzer like this one. This device saved me a lot of time while implementing & debugging a wireless CAN bus.
Here is a thread with some screenshots...

The datasheet of the CirrusLogic CS4272 specifies group delay for the both the ADC and DAC circuitry.
This 24bit/192kHz codec is used in the Focusrite Scarlett 2i2 3Gen USB audio interface.

Paul

I hope these 2USD boards have a genuine PCM5102A mounted...
On Aliexpress I see PCM5102A chips offered at 1.5USD but they do not have the BB logo printed on the package. Genuine parts do have the...

Please do not connect a 10K from 5V to a Teensy 3.6 pin, T3.6 pins are NOT 5V tolerant. See this page.

Regards,
Paul

Not obsolete (yet), see http://www.princeton.com.tw/en-us/products/multimediaaudioic/digitaltoanalogconverter.aspx
I had an email discussion with them recently on the 2 versions of the PT8211, see...

In case you're interested; I did a bunch of measurements on several DAC's. See this thread.
The PCM5102A is my favorite from a cost vs quality perspective.


Paul

For completeness, here are the measurements on the SGTL5000/PJRC audio adapter board:

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and the TDA1543 [that old, non-A version in an 8DIP packaging]:

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Disclaimer: these are all...

True. I'm so used to Teensy's with multiple serial ports that I forgot about this.
But you could use the SoftwareSerial library to create an additional serial port for the HC-05 on the Leonardo....

Do you have also suggestion for using bluetooth connectivity between teensy and arduino leonardo?
You could have a look at the HC-05 BT module. Google for "HC-05 arduino", you will find a lot of...

Again it depends on datarate, distance, power consumption for the wireless link but perhaps the nRF24 module is a good starting point?
See these links for more info:
Information:...

The first Google hit shows PJRC's page for a Teensy 4.0 breakout board and related information.

Paul

Hi Ryan,
Reading the Github start page of the FreqMeasureMulti library, it states a capture mode called "FREQMEASUREMULTI_INTERLEAVE".
If I read that correctly, it measures time between edges...

Hi,
It depends on what code you want to run on the Teensy end. If you need a lot of processing power, go for the Teensy 4.0.
If you don't need that, go for the 3.2. It is still is plenty more...

Just checked my Acer laptop and it supports the CTIA "standard". GND on the second ring, counted from the tip.
More info here.

Paul

To make life more complicated: apparently there are 2 versions of the TRRS [4-pin] jack?

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Yuck...
Paul

Correct. However, there are a lot of (semi)pro DMX spots out there with the 3-pin XLR. This is the spot I tested with.
You're right, I mixed up the pin numbers in message #4. Pin 2 of the XLR plug...

You can compile your code by selecting the LC in the IDE and see whether RAM and Flash is sufficient.
Performance-wise, the LC should indeed be OK for your purpose as you describe it.

Paul

Good, so the hardware seems to be OK then.
So the issue is playing the .raw file, either the file itsself or the audio library.
Did you try the WaveFilePlayer example using an ordinary...

Probably superfluous, but did you solder those 5 pins in the red circle as well?

23654

Paul

That's what I didn't know either but Pete's links in his message showed that it is feasible.
I just tried it. Using Goldwave, I inserted 2 cue points:

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saved the .wav file, closed the...

The first thing I see is that the Reset line is pulled high to +5V. I don't think the TI chip likes that because it's powered by 3V3.

Paul

Nice job!

Paul

Thanks Pete, didn't know about that feature!

Paul

What kind of amplitude analysis do you have in mind? Peak level of the whole .wav file or RMS value of shorter part or...? The Teensy audio library has a number of analysis functions.
About the cue...

The pads must be separated if you want to power the Teensy externally and connect the USB cable for uploading/serial communication at the same time.
If the pads are connected, the external power...

Well, not really a strip but yes, I've got the APA102 [what DotStars are] to work on the T4 using this code:

#include <FastLED.h>
#define NUM_LEDS 1
#define DATA_PIN 11
#define CLOCK_PIN ...

Yes, it is possible to use the objects of the Teensy audio library inside the Arduino IDE [if you installed TeensyDuino].
On the Mozzi GitHub page you can see that they already tested on a Teensy.
...

Hmm, I'm out of ideas now. I would have a close look at the PCB again with a magnifying glass and check whether there are very tiny solderballs laying around that short pads/pins/parts.
Is your...

Is your external power source perhaps acting up? What exactly is your external power source? And can you try another 5V supply?

Paul

Hi, are you currently using the Arduino IDE for programming the Nano with the Mozzi software? If so, you only have to install Teensyduino which is an add-on the Arduino IDE.
See this page.

Paul

Perhaps the red and yellow wire in your setup are flaky? I have had problems once or twice with such wires...

When the 5V and 3V3 are present, but still no blinking, you can do a factory reset of...

Usb only with no external 5v works fine
This means that the Vin was not separated from the USB.
Are you sure that you cut the very small trace between the pads [as indicated in the red circle]?...