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Type: Posts; User: elkayem

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    There are a number of different ways to convert...

    There are a number of different ways to convert 3.3v logic to 5v. The first question to ask is whether you even need to convert. This depends on the synthesizer you intend to drive. It is possible...
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    Thank you for posting this Robin!

    Thank you for posting this Robin!
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    I am glad this project looks useful to you. I...

    I am glad this project looks useful to you. I used the Teensy 2.0 in this project because I wanted the 5V outputs on the gate and trigger, and the 2.0 is more than enough to get the job done. Of...
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    Thanks! This looks like "Option #3: Two 1N5817...

    Thanks! This looks like "Option #3: Two 1N5817 Diodes" on the "Using External Power and USB" link I referenced in my post, with the additional diode on the top. Yes, that does look like a good...
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    External power and USB

    I've put together a few projects requiring that I cut the 5V pads as shown here. There have been times when I would have liked to temporarily reapply usb power, for example, when uploading a sketch...
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    I love the uncanny eyes project! I have a pair...

    I love the uncanny eyes project! I have a pair installed in our garage (in a creepy owl head), where the eyes open up and look around anytime someone opens the garage door. It also makes an...
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    Thank you! And the espresso tastes great!

    Thank you! And the espresso tastes great!
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    [posted] Teensy Coffee Roaster

    Introducing... a Teensy 3.5-powered coffee roaster! This is a "fluid-bed" style design which will roast a half-pound of coffee, precisely tracking a custom roasting profile, and saving the roasting...
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    Thanks for the tip! I will update the list of...

    Thanks for the tip! I will update the list of materials.
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    If you can find a 7.7k resistor, by all means use...

    If you can find a 7.7k resistor, by all means use that! 4.7k and 3k are more common. Be sure to use metal film resistors which are more temperature stable.
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    Wes, I'm glad you found this useful! In response...

    Wes, I'm glad you found this useful! In response to your first question, yes I did choose the Teensy 2 because I wanted to use 5V logic. I see no reason you couldn't use a 3.3V board. You will...
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    I did not have any ground loop issues. I...

    I did not have any ground loop issues. I primarily use my iPad so don't need to worry about the USB ground. At least one ground is required for the CV out, and the others can be disconnected if...
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    Oddson, you've inspired me to add the ability not...

    Oddson, you've inspired me to add the ability not only to configure the scale factor calibration at compile time, but through the user interface (and stored in EEPROM). My own build required...
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    Terrific, thanks Paul! I just pulled your latest...

    Terrific, thanks Paul! I just pulled your latest version of the FreqMeasureMulti library.
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    I would have preferred to use a higher voltage...

    I would have preferred to use a higher voltage DAC were it not for cost. The 12-bit, 2-channel MCP4822 is hard to beat at $3/chip from Mouser.

    Your post has me thinking, maybe I should make the...
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    Oh WOW! Now you’ve got me excited. Your design...

    Oh WOW! Now you’ve got me excited. Your design is exactly what I was hoping for! Now I have my next project. Off to Mouser and eBay to procure some parts...
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    Seems like something that should be standardized....

    Seems like something that should be standardized.

    I can’t help noticing your username and the instrument you are playing in your photo. I would love to BUILD (not buy) a Theremin. There are...
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    Just tried it. Brilliant! Yes, it works. I was...

    Just tried it. Brilliant! Yes, it works. I was never concerned about my code outputting the right result. I had a 2x in front of the frequency to correct this issue. But I knew this was a more...
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    Thanks, very useful info! I wasn't aware there...

    Thanks, very useful info! I wasn't aware there was a convention on middle C volt output. I am using only a single sided supply, and limited myself to the 88 notes on the keyboard with A0 (Note 21) =...
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    Take a look just a little bit further in the code...

    Take a look just a little bit further in the code snippet you shared. You will clearly see that I do provide a means to tune in software. This is also detailed in the instructions I provided. I...
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    Thanks Manitou, looks like you reproduced what I...

    Thanks Manitou, looks like you reproduced what I am seeing.

    Just to be clear, I’m running the example:
    ...
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    Sorry, I don't think I answered your first...

    Sorry, I don't think I answered your first question either. Scope is measuring rising edge, so whole cycles. When I connect one of the FreqMeasure pins to 13, I measure 2.5 Hz, but visually the LED...
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    The LED strobes at 5 Hz, which I think is as...

    The LED strobes at 5 Hz, which I think is as expected (100 ms on, 100 ms off).
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    FreqMeasure frequencies off by 2X

    I am running the FreqMeasureMulti example "Serial_Output" straight out of the box on a Teensy LC, and getting frequency measurements that are exactly half of what they should be (as measured on my...
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    [posted] (yet another) MIDI to CV Converter!

    I'm sure this project has been done countless time, but this one is mine, and comes in a nifty 3D printed case!

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    It's a multi-channel USB MIDI to CV converter based on the Teensy 2.0, the...
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    Problem possibly resolved... I swapped out the...

    Problem possibly resolved... I swapped out the OLED for another identical one, and the problem went away (so far). I twirled the wheel for several minutes and couldn't get it to recur. When I go...
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    Interesting idea. Iíll give these ideas a try...

    Interesting idea. Iíll give these ideas a try when I get an opportunity. I can also try slowing down the I2C clock. It is running at 400K, as you noted by the short rise time. I do wonder, if...
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    And one more example of the I2C when the chip...

    And one more example of the I2C when the chip freezes up. This one is interesting, as it looks like SCK freezes up, but there is one more bit of data that gets sent. Still the same at freeze up...
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    And a close-up of the I2C message as it met its...

    And a close-up of the I2C message as it met its untimely end.

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    Hi Paul, I sense you're on to something with your...

    Hi Paul, I sense you're on to something with your question.

    I looked at SCL and SDA on my scope. When the message gets through (no crash), it appears to me that a full I2C command to the display...
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    F() is a macro that tells the compiler to store...

    F() is a macro that tells the compiler to store and access the string from flash memory rather than RAM, saving the RAM for more important things. I believe Paul Stoffregen wrote this macro ages...
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    A few more observations: it seems to be more...

    A few more observations: it seems to be more likely to crash if I spin the encoder knob fast. I can turn the knob slowly all day with no problems.

    Also, I have seen a crash at least once now...
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    SSD1306 Library crashing Teensy 2.0

    I love these little 128x64 OLED displays, and have used them in many projects. However, I'm encountering a very odd issue. I have a menu driven system, and use a rotary encoder to select items on...
  34. Thanks Paul, exactly what I need! Some light...

    Thanks Paul, exactly what I need! Some light holiday reading...
  35. Thanks, that clears it up for me! Time for me to...

    Thanks, that clears it up for me! Time for me to start educating myself about USB protocol. Also, time to pick up a Teensy 3.6!
  36. Wow, a reply from the man himself, within the...

    Wow, a reply from the man himself, within the hour! Thanks Paul! Yes, that does look like it would do the job. And I like how the cable has mounting holes so it can be installed in a case.

    So I...
  37. Connecting Teensy USB Midi device to other device with Type B connector

    First post to PJRC forum, and wow this is an active community! Terrific!

    I am using a Teensy 2.0 as a MIDI to CV device, so I can use my iPad or computer to drive multiple CV inputs on my analog...
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