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Got it working. It was the file names. Some were 8.3 and didn't work, changed to all UPPER CASE before the . and lower after like Paul's examples had and it worked. Had to rename files as below: MONI1.wav 160806 copying... PSCAN.wav 105442 copying.. NSCAN.wav 104942 copying...

I see System Volume Information on my microSD card and I think it may be why the copy all files program to move all to serial flash is failing. >>>>>> EDIT solved see 2nd post. Sorry, I have to learn to give it more time before I ask for help. At least a day from now on. The serial flash...

I thanks for the help guys

I see that MCLK is on 11 not 23 on the 3.2 so I will make that change tomorrow if things are slow enough so I get to work on it.

Awesome Paul Thank you thank you thank you. For the record I am using 3.2's and the proper shield. Nothing like shooting yourself in the foot over and over. You made my day. Somehow I had it show up using a scanner and then just stop later when I tried to run it again. I must have had moved...

Ok I can play the wave file in the tutorial also the one that just beeps works. Can anyone verify that means that the I2C bus MUST be working with the Teensy? I am not seeing the chip when I scan the buss but I don't understand how it could be playing a wave from a microSD without the I2C...

Good choices Which chip you use for LIPO management? I have a few 18650's but they are junk. Rated 10,000 mah but test about 1000 or less. You can't even test them with a load under about 10 ohms or they just drop to nothing instantly. I do have some 900ma I hope are close to their spec. I...

Thanks Frank. I will try to include as many of these as I can fit in 10cm sq. I like the pre-crimped wire but the ones I have are ribbon cables but those should hold up much better. I am not sure yet if I want to break out the bottom side smt pads. I am going that on a board for work mainly...

I am thinking of trying out JLC SMT assembly service and I am looking for ideas on what to add to a general purpose board the Teensy would plug into. 3.3v regulator powered from the usb 5v on the Teensy pin, a few rail to rail op amps with jumper selectable gain, I2c OLED display, and some...

CircuitPython 7.0.0-rc.3 was posted already too. Looks like it had just one fix for RP2040 over rc2. Following this because I am about to try CircuitPython for a little project using I2C myself.

Thanks for taking a quick look at it. That's above and beyond. Yes the ISD5116 pretty well isolated on a board subassembly that plugs onto my board. It is behind a 2.8v regulator on that board in a section with a soldered metal shield. . The 2.8v of the board I plug into is not routed off on...

I remember now what I was worried about 18 and 19 are the default for SDA0 and SCL0 I can't use 16 and 17 at the same time I have to use a pair on the pads on the back. ref: https://forum.pjrc.com/threads/21680-New-I2C-library-for-Teensy3

I will took a look at 16 and 17 and they are free I might as well use them. Thanks!

PS: My PCB has jumper pads and could just be moved to the alternate i2c pins but I wasn't sure if 2 I2C ports at once would cause issues.

Yes its a home made PCB and it has worked at times but before I can get everything working at once the I2C quits working even with the port scanner. The chip is I am working with is an ISD5116 made by Winbond sometime near 2002. Very old analog solid state voice storage chip used mostly in...

I have managed to blow up 2, maybe 3 (one went missing but I think it had the same problem) specifically they no longer show up on the I2C bus. To be clear the signals on both pins SCL and SDA look perfect on the scope still directly on the Teensy pins at the board board and on the audio board...

Thanks for the help! It's not a sound card.... they are 20 year old pagers for fire departmens that need the channel announcements restored after they got scrambled.:)

Would the proper way to make an audio board compatible mono raw audio file (sine wave) be to just write a u16_t’s with the proper phase adjustment per 1/44,100 seconds? If I wanted the amplitude to read -6dm in Audicaty would the peak to peak be 2^8 or does the Audicaty add some “head room”? I...

Thank you Paul. I am just trying to restore voice channel alerts on old pagers and the original voice isn’t the best quality to begin with. The chip has a 3.2 kHz low pass filter and uses 8 khz internally so 11 probably would be fine. Thanks for the details and hopefully others will have use...

I have thought about it some more and I will just add the footprint for one of the serial flash chips that the audio board uses. I want to do a couple minor tweaks and move the pine used fir an led so I now would be the perfect time. If I do it right nothing will conflict with the audio board...

I only have about 16 seconds of audio for a project I am working on and sticking it on a SD card seems overkill. Right now its in raw format 16 bit recorded on the audio adaptor Paul designed and sold on PJRC etc. I think I could get by with 12 bit audio at 8 khz instead of 44.1 khz and 16...

Are the T3.2 outputs stronger than on T4.x’s? I am using some 470 pull-ups on i2c lines and my want to consider a higher value. Just used 470 because a had a strip of 100 handy.

The 6db attenuator did the trick and the waveform is now centered around 0v in Audacity too. My samples are all stored and ready. Now to wait on the next revision of my pcb to arrive.

I can’t believe the level of support Paul and the Teensy users on this form have given me over the years . Thank you all.

Thanks. I wasn’t aware this offset was normal. I will do a voltage divider to cut the peak to peak voltage in half voltage. If that is not enough I will adjust as needed. I am working with announcements stored in an ancient “analog voice storage” chip and once I have good copies of all 7...

PS you can play both raw and wave files. Which would have have the fewest dropouts playing from an SD?

The recorded sample sounds great in Audacity but when I play it back the level bar maxes out in the red at 0 on voice peaks. Is this the proper level or should I attenuate it a bit? I am using the line level input on the audio shield. I found the "Find clipping" tool under analyze and it does...

I think I am looking at outdate information from the Audio Library Development Roadmap: Continuous recording to SD cards remains an elusive feature. I need to record one channel (mono line in) with a record length of only a few seconds. Would using the flash chip that can be solder on the...

I didn't look hard enough. There is even some info about it on PJRC itself.

A quick search shows some support for Teensy 4.0 on crates.io but I didn't see any crates for the 3.2. Anyone use Rust on either or both? I know is not supported by Paul. To be honest I have no idea how he manages all he has on his plate now.

Yup just need a count. The chip i am working with puts out a pulse and I need to count them and send a stop back to it after the count reaches a set amount. I looked at the docs again and the pulses only come once about every 250ms, not 8khz like I thought. 8khz was the rate it stores -analog...

I need to count pulses that won't be faster than 8khz. I Also need to trigger an interrupt after matching a programmed count. The count needs to be 16 bits. Any pins open for that not shared with the audio adapter?

Just analog audio, line level.

Thanks! That would have saved ma lot of work a few years back.

The board/chip I am using will both receive from and output to the audio adapter. The board has separate grounds for audio and digital separated by ferrite beads. Should I run a separate isolated ground line from the adapter from the audio adapter line in and outs to the analog ground on the...

Wouldn’t that mean soldering in the Teensy to the audio board? It’s for work and would like everything to be as easy as possible to replace because of the abuse it will likely take. I guess it’s their buck they could buy both. 🤷*♀️

Anyone have a good header option for plugging the the Teensy into the audio board and having a small board with a connector on top of the Teensy? I am trying to get away from a pcb - audio card- Teensy- pcb stack and just hook the Audio in and out up with a ribbon another cable.

EDIT: found the headers... Thanks again. Do you happen to know where I can find the Audio.h file on windows 10? I searched the drive and it did not find it. I have a copy from Paul's github but I would like to know where its located locally.

Thank you! I have to recreate all my code from 2 -3 years ago, I forgot a lot. I got the I2C scanner working to day now I just have to check if the audio board uses address 40 for anything as it showed up in the scan and the documents for the chip I am trying to talk to says it should be on...

Not sure which one I have restarting an old project from 2 years ago. Any pin function changed over it's run I should keep in mind? Anyone have issues with slow scl and sda rise times with your audio board attached? I know the pull up should be 100k or so but I had to use 4.7k and even then I...

Is Teensy 4.1 even an option? Does it work the 4.0 firmware and the common pins?

@defragster thanks. Got a psram coming from PJRC I can use later I guess or with Arduino. I bet the flash would hold 30 seconds of audio.for a project I have in mind I could do in Arduino if 12 bit audio sounds good enough. The source is definitely not very hifi and the SD card would be way...

On mine I am going to try some python but what would be better two psram chips or one and a flash chip?

Thank you Paul, Awesome job yet again.

"Everyone on this list who does not receive a pre-production board will be offered a free Teensy 4.1" I was lucky enough to be on the list, do I need to email PJRC to get one? I am honored to have made the list but to tell the truth I am not sure what I did to make the cut.

41 would probably be more than u ever need seeing as the options you can solder on the bottom already. .

Will there be pads for extra io’s on the back for surface mount connectors like in the 4.0? I will probably buy a couple when they ship either way but most of my microcontrollers end up unused until I think up a project and I have a ton never used at all.

I want to learn Python and Rust but I just keep putting it off. I hope this nudges me to give it a shot.

All the drivers you get with circuitpython sure make it seem easier for a noobie. I haven't started my embedded python journey yet but will very soon. The 4 is the first microcontroller I fell is plenty fast enough to run almost any script fast enough for almost any project.

Would it be practical to try to use a Teensy 4 fft to display +/- 50khz and 20khz around a center of 455 khz as an aid to peak and center if? I could really use that at work. They are too cheap to buy a spectrum analyzer. Heck the scope I have to use is an old tube one with 20mhz bandwidth. I...