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Type: Posts; User: Andy Belov

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  1. Yeah, I know all this. Can't wait a few months...

    Yeah, I know all this.
    Can't wait a few months and i need it to be small, and with sd card on the same side as usb.
    I think I'll just risk $20 and try it. Going to order the first Pcb next week...
  2. Can I "re-bake" Teensy 4 to surface-mount it on my PCB?

    What will happen if I make a cutout in my PCB for the bottom components in the middle of T4 and use pads instead of the castellated cutouts?
    Then I'll put it in one of these:...
  3. Just found the answer:...

    Just found the answer: http://forum.pjrc.com/threads/49192-Adding-a-charging-circuit-to-a-project?highlight=load+sharing+charger
    "Load sharing" is the key phrase.
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    @defragster I was replying to this from...

    @defragster

    I was replying to this from @eegee:
    "Hey Andy - it looks like from your pictures you added a 2nd USB connection for your keyboard - is that right? I’m hoping to just use the onboard...
  5. I didn't touch the jumper, so it's on 100mA now....

    I didn't touch the jumper, so it's on 100mA now.
    I just want to see what other people use. And I want the "Battery level" indicator with a pin on the charger.
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    @eegee - I don't know if the onboard usb can be a...

    @eegee - I don't know if the onboard usb can be a host. I did add a new host USB socket with a current limiter. I took it from this board:
    https://www.pjrc.com/breakout-board-for-teensy-4-0/...
  7. Well, it's wired "by the recipe": cut the wire on...

    Well, it's wired "by the recipe": cut the wire on Teensy, VUSB goes to the charger, the battery to VCC on Teensy.

    I guess I know about the problems you describe, but I'm asking whether someone has...
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    I did it:...

    I did it: https://forum.pjrc.com/threads/57987-Got-a-MIDI-keyboard-working-with-Teensy-4-0
  9. Problem with battery charger for Teensy 4.0

    I have this charger: https://www.adafruit.com/product/2124
    It works fine if I wait for the battery to get fully charged. But if the battery is low and charging, the voltage on Teensy 3.3V output...
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    Wow, such a detailed answer, and from Paul...

    Wow, such a detailed answer, and from Paul himself! Thank you.

    I'm sure many people here can use this information.
    I'll trust your experience and will definitely mention your name.

    Really hope...
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    Thanks, Static. Show me Teensy 4 "surface...

    Thanks, Static.

    Show me Teensy 4 "surface mounted" with all bottom parts and holes soldered to proper (not router butchered) castellated cutouts and I'm all yours (he-he).

    And I'm as serious as...
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    Thanks, Kurt. Here is what I'm going to do for...

    Thanks, Kurt.

    Here is what I'm going to do for the prototypes:...
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    Well, I must say the news is not good so far. Did...

    Well, I must say the news is not good so far. Did a little research and it doesn't look like I can be making profitable PCB's in the States.
    Somebody, please, prove me wrong!!! I do want to make it...
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    Making an assembled PCB in US

    I'm getting close to finishing my design for a guitar effects board.
    I wonder if anybody can recommend a good US-based manufacturer for PCB's.
    I need it assembled, mostly SMD's, a few connectors,...
  15. What's a "wrong aux-in"? Are you saying that the...

    What's a "wrong aux-in"? Are you saying that the audio board can get smoked if its phone jack is plugged into some "wrong" amplifier?
    The phone jack on my audio board just it just stays plugged into...
  16. From diagram, to PCB, to plastic case

    I'm ready to make my new awesome electronic instrument.
    I need to design a PCB, make a 3D model of it and design a plastic case for the PCB.

    I tried KiCAD and rejected it because it doesn't move...
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    @KurtE, thanks for such a detailed response....

    @KurtE, thanks for such a detailed response.
    These are pretty expansive, indeed. I'm sure eBay will come to the rescue.

    Also, I posted this question about CAP1188 on Adafruit forum:...
  18. Thanks so much. This is what I was looking for....

    Thanks so much. This is what I was looking for. I'll try that, as I am in possession of a good analog oscilloscope.
    But the screen and the sensors "sound" differently, so I may need 2 filters.
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    Thanks, Michael. This is as affordable as it...

    Thanks, Michael.
    This is as affordable as it gets: $29 for each.
    I still hope for the other people to do the tedious work for me (he-he).

    Maybe I need to start looking for an alternative to...
  20. Adding guitar preamp to the line input

    I have added a guitar input to the Audio Board (rev. D). It's based on TS922 op amp.
    I put a capacitor on the preamp output, 10uF was all I had, just before connecting it to the Line In of the Audio...
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    Wow, that's advanced. I need to start learning...

    Wow, that's advanced. I need to start learning about all this Logic Analyzer thingy. Which one do you use? Hope it's not too expansive.

    My guess is that Teensy 4.0 is so much fast than anything...
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    Thanks, Kurt. I have no idea how you figured...

    Thanks, Kurt.

    I have no idea how you figured it out, but that was the first half of the solution.
    Addind the "delay(1);" in readRegister fixes the reading.

    What I also found that it fixes the...
  23. Just got the TS922 today:...

    Just got the TS922 today: http://www.digikey.com/products/en?keywords=497-6035-1
    Did my usual "wire mounted device" technique:
    17919

    It is much more quiet than the LM358 and I think it just...
  24. Ok. That concludes my research here. I didn't...

    Ok. That concludes my research here. I didn't know about the high latency of A2DP. I guess it's good for playing musing, but not for something requiring latency below 10 msec.
    I'm not giving up on...
  25. Had no idea about this. Good to know. All I'm...

    Had no idea about this. Good to know. All I'm looking for is to save time digging around how to connect all this. I'm going to try it all anyway and see if it's good enough for an amature guitar...
  26. Thanks, Chip. Very valuable information. I think...

    Thanks, Chip. Very valuable information. I think I'll do just that and add yet another simple bluetooth just for talking to the phone.
  27. This is exactly what I need. I'm making a guitar...

    This is exactly what I need. I'm making a guitar "pedal" and want it to work as a wireless guitar transmitter, so that you can run around like young Eddie Van Halen. I'll use the Audio Board line out...
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    Thanks, Paul and Kurt. Appreciate all the help.

    Thanks, Paul and Kurt. Appreciate all the help.
  29. Need bluetooth for sound streaming and data transfer

    I have this crazy idea of having a bluetooth module connected to Teensy 4.0, which can stream sound from the Audio Board to bluetooth headphones or a sound system, and at the same time be connected...
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    1 or 3, same thing.

    1 or 3, same thing.
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    Tried to change the "if" like below. Still see...

    Tried to change the "if" like below. Still see the "?????" in the monitor. Don't understand how it can print "0x1" and fail to compare to it.
    Anyway, I commented the "if" out and can see the...
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    Forgot to mention. It's Teensy 4.0 Love it. Want...

    Forgot to mention. It's Teensy 4.0
    Love it. Want to stuff it with everything I can.
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    Yesterday I downloaded the latest of everything....

    Yesterday I downloaded the latest of everything.
    Checking now.
    Adduino help says Adruino 1.8.10 and Teensyduino 1.48
    The Adafruit library I downloaded today.
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    Sorry, forgot the connections and the monitor...

    Sorry, forgot the connections and the monitor output.
    I just thought that the fact that the I2C scanner finds all boards proves that the connections are good.
    I use I2C on pins 18 and 19.

    Here...
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    Just got 3 of these:...

    Just got 3 of these: https://learn.adafruit.com/adafruit-cap1188-breakout/wiring
    Put them on the breadboard, ran I2C scanner and says that it found all 3, but the Adafruit example says "CAP1188 not...
  36. Got a MIDI keyboard working with Teensy 4.0

    I'm absolutely astonished! It all worked the first time.
    For the first time in my life I soldered an SMD chip with hot air gun:...
  37. Found it: C:\Program Files...

    Found it:
    C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\USBHost_t36\examples\Serial\MIDI\InputFunctions

    I just got the connector and the current limiter. Will try it this weekend....
  38. Teensy 4.0: need an example of using USB host

    I want to connect a MIDI keyboard to the USB host on Teensy 4.
    Just can' t find any examples of reading from it.

    If anybody has an example of reading data from the USB Host (D+/D-) port on Teensy...
  39. Appreciate the advice. I'm new to guitar preamps...

    Appreciate the advice. I'm new to guitar preamps and just followed SparkFun's proto pedal diagram.
    I'll try that.

    And I just found out that MPR121 (12 capacitive sensors in one chip) is no longer...
  40. For the amp, you need to find what you need. I...

    For the amp, you need to find what you need. I used a very small one, to fit my instrument. For the accordion you need something loud, just mind the battery drain for it.

    For the headphones you...
  41. The charger is integrated. It charges from the...

    The charger is integrated. It charges from the USB, just like your phone.
    The only thing I added is a 3 contact switch. In the Off position, it connects USB power to the VIN, as it did before you...
  42. Here is the charger I use with Teensy 3.6 and...

    Here is the charger I use with Teensy 3.6 and 4.0: https://www.adafruit.com/product/2124
    Battery I use: https://www.adafruit.com/product/2011
    I make something a little similar: QuantoGraph.com
    ...
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    Did anybody use CAP1188?

    I just found out that MPR121 (12 capacitive sensors in one chip) is no longer made and has been replaces with CAP1188 (same thing, only 8 sensors).
    Did anybody try it yet with Teensy?

    I'm going...
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    Hi Rob, Yes the documentation is never on the...

    Hi Rob,

    Yes the documentation is never on the top of the list of any good programmers. They just make things awesome and superfast.

    For speed, the text is drawn without touching the background,...
  45. I see what you mean, Derek, but my guitar buffer...

    I see what you mean, Derek, but my guitar buffer (LM358) is powered by the same Teensy.
    Everything is on the same board, powered by the same battery, connected to the same ground.
    The guitar...
  46. Buzzing noise with audio line input from cap sensors

    I have 3 Adafruit_MPR121 capacitive sensors and a touch screen with my Teensy 4.0.
    When I touch or release the screen or the sensors, I hear a pretty loud buzzing sound from the Audio Board, but...
  47. I got it working, both the Audio Board and the...

    I got it working, both the Audio Board and the screen, but only as long as I keep the SD card out of the Audio Board.
    As soon as I just stick the SD card back into the slot, the screen doesn't show...
  48. Hi Derek, Good to know that I'm not alone in...

    Hi Derek,
    Good to know that I'm not alone in this. I'm making a compact (big pocket size) musical instrument which needs a screen, the Audio Board, about 30 capacitive sensors, bluetooth with A2DP,...
  49. Sorry, forgot to ask what SD card reader will fit...

    Sorry, forgot to ask what SD card reader will fit on Teensy 4.0 (bottom side) ? I've never done it and they all look so different.
    Can somebody point out one for me on Amazon, preferably?
    Thanks...
  50. Teensy 4.0 with Audio Board and ILI9341 screen wiring

    Did somebody already wire the ILI9341 screen to Teensy 4.0 stacked with the new Audio Board? Ideally, without using the bottom connectors.
    Just trying to save myself some time figuring it out....
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