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  1. Replies
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    Which external ADC (and or module) did you wind...

    Which external ADC (and or module) did you wind up using. I may have a need for something similar.
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    @Donziboy2, You could scatter the screen updates...

    @Donziboy2, You could scatter the screen updates across intervals (e.g., print only say 20% of the info each interval), so as not to delay processing too much for that interval.

    Also, how about...
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    I am really liking the specs of the INA233AIDGST...

    I am really liking the specs of the INA233AIDGST from TI. It is a High-Side or Low-Side Measurement, Bidirectional Current and Power Monitor (16-bit ADC built in) which seems perfect for use with a...
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    Just picked up ten of these bad boys for $5 a...

    Just picked up ten of these bad boys for $5 a piece (all in with shipping) from a reputable seller on eBay: IXFZ520N075T2 (Mouser link) ##### (Datasheet)

    I don't know how I am going to mount them...
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    I guess I was ignorant of the commercial vehicle...

    I guess I was ignorant of the commercial vehicle sector when it comes to high levels of DC - was thinking more of home/shop/factory (stationary) electronic devices...
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    Are there any devices any more that even use more...

    Are there any devices any more that even use more than 24 V DC any more? It seems like it's 24 V or less for pretty much everything these days, with 12 V becoming the new high. The trend is clearly...
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    Heck, I'd go for 24-bit ADCs (with 19-20 ENOB) if...

    Heck, I'd go for 24-bit ADCs (with 19-20 ENOB) if I could get them to communicate with the Teensy easily (and to get a max REF voltage of 5 V or more, if possible). I bought a board on ali-express,...
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    One hell of a cooling solution you say? Well I...

    One hell of a cooling solution you say? Well I really got lucky in this department and picked this sucker up for a total shipped price of $45 on eBay:

    11669 11670

    For size references:
    ...
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    I am just going to reply to the pricing aspect of...

    I am just going to reply to the pricing aspect of this for now, I still have to digest the rest of the info:

    Consider buying them on eBay, especially the Buy it now or Make an offer variety where...
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    You are clearly referring to the thermal...

    You are clearly referring to the thermal instability limitation which would often cause the downtrend SOA line to have a steeper downward slope at higher voltages (and which requires actual...
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    @Donziboy2, the IRFP250n is also not...

    @Donziboy2, the IRFP250n is also not characterized for linear operation. I don't know why pro load manufacturers use it, unless they did their own statistical analysis of failure rate.

    It is a...
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    Looking at Figure 8 of the Datasheet at the link...

    Looking at Figure 8 of the Datasheet at the link you posted, you will notice that the safe operating area for this Mosfet is only characterized to 10 ms. The implication is that we do not know what...
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    Can these boards be purchased or do we have to...

    Can these boards be purchased or do we have to order the PCBs and build them ourselves?
  14. Replies
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    Hi, I am back on the dummy load bandwagon and...

    Hi, I am back on the dummy load bandwagon and decided to chime in once again. Reviewing your latest schematic, I noticed that you plan on using IRFP150MPbF MOSFETs. Pouring over the datasheet for...
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    Using an ADS1256 board with the Teensy 3.6

    Is there a write-up somewhere on how to get the ADS1256 to work with the Teensy 3.6? I tried using the Flydroid library with no luck: https://github.com/Flydroid/ADS12xx-Library.

    The board I have...
  16. Speaking of all of this, is there a sample...

    Speaking of all of this, is there a sample circuit anywhere showing a Teensy 3.5 or 3.6 wired to a MAX485 board like these ridiculously cheap ones on ali express:
    ...
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    Perhaps a stupid question: In reviewing...

    Perhaps a stupid question:

    In reviewing multiple electronic load designs, including yours, it seems like they are all designed to effectively place a short on the power supply being tested with...
  18. If you declare the Teensy as master, how does the...

    If you declare the Teensy as master, how does the many Teensys to One Pi work out (see the picture in post #17, above)?
  19. Just want "as fast as possible" data transfer...

    Just want "as fast as possible" data transfer from the Teensys, which collect the data, to the Pi (or other master device that captures telemetry data coming from multiple sources). This is a fairly...
  20. Does this library support the use of a Teensy 3.6...

    Does this library support the use of a Teensy 3.6 as an SPI slave to say a Raspberry Pi 3 B or some other SPI master device?

    I am especially interested in multi-Teensy configurations like the...
  21. That's a lot of writes. I'll stop worrying now...

    That's a lot of writes. I'll stop worrying now...
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    So perhaps a stupid question, but wouldn't it...

    So perhaps a stupid question, but wouldn't it make sense to communicate from a Teensy to a Raspberry Pi 3 and just send data having the Raspbery Pi 3 display it over HDMI to a real high resolution...
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    I am very intrigued by the ePaper display. I...

    I am very intrigued by the ePaper display. I wonder why these are so low in the resolution/DPI department, given that they are monochrome?

    Also, this disclaimer on the page is rather ominous:
    ...
  24. Teensy 3.5/3.6 upload limit due to flash erase/write cycles

    What is the limit on how many times you can upload a program to the Teensy 3.5/3.6 before wearing out its flash. Very often while troubleshooting, I upload tens if not hundreds of times and am...
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    Does Teensy 3.6 actually do dp floating-point...

    Does Teensy 3.6 actually do dp floating-point arithmetic (e.g., multiplication/division) in hardware? Or is this stuff emulated somehow?
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    I have both a 3.2 and a 3.6. I just finished...

    I have both a 3.2 and a 3.6. I just finished soldering the pins on the 3.6 and wanted to get info on max performance to see how I can use it for my needs.

    In fact, you commented on my pics of the...
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    Teensy 3.5/3.6 overclocking

    Does it make sense to passively heatsink the CPU on these for even more overclocking potential beyond 96 MHz (e.g., Arctic Silver + a heatsink stolen from an old video card)? Is it even possible to...
  28. Nice! I just realized you can use your mouse...

    Nice! I just realized you can use your mouse wheel to zoom in and out of that.

    Actually, with regard to the milling, the smaller plated through holes (i.e., not the outer connectors) are quite a...
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    If you want to get an MPU-9250 board cheap and...

    If you want to get an MPU-9250 board cheap and with free shipping and pins:

    Ali express link. Total cost of $4.48 delivered to US address
  30. I noticed that as well. Such is life when...

    I noticed that as well. Such is life when electronics are Made in China. Do keep in mind that we are nitpicking a couple hundred μm offset here (i.e., no biggie electronically/mechanically and only...
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    I have posted links to very high resolution...

    I have posted links to very high resolution images of the front and back of the board in the General Discussion forum:

    Forum post with links to high-res photos of the Teensy 3.6 (front/back)
  32. Teensy 3.6 ultra high-res high quality photos

    Here is a high-quality macro photo taken of the back of the final release Teensy 3.6 (i.e., this is not a beta board). It is cropped to a resolution of 3555x1146 (4 MP cropped). It was taken by me at...
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    The thing is that the LM2776 produces a crazy...

    The thing is that the LM2776 produces a crazy amount of output ripple (>100mV for small currents). For this reason, I am not a big fan of it in combination with a linear voltage regulator (like the...
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    Is the FFT and display code your own, or is it...

    Is the FFT and display code your own, or is it some library?
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    Sounds very reasonable - good luck!

    Sounds very reasonable - good luck!
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    Speaking of Ethernet, is there any ETA on some...

    Speaking of Ethernet, is there any ETA on some sort of Ethernet shield, module, or connector for the 3.6?
  37. Perhaps a stupid question: What can you use this...

    Perhaps a stupid question: What can you use this for? Finger gestures for input? Seems pretty expensive for that...
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    The Pi Zero is a giant scam. It costs $5 in the...

    The Pi Zero is a giant scam. It costs $5 in the US for the board, but you can't buy more than Qty:1 anywhere in the US and then wind up being gouged $10 for shipping on it, bringing the price up to...
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    Wow, what is the resolution on that display and...

    Wow, what is the resolution on that display and is it wired directly to the Teensy (and if so, which Teensy?)

    i.e., what are you to the left of the display in the video :cool:
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    Cool! Keep us posted...

    Cool! Keep us posted...
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    Could you please post a link to OSH-Park for...

    Could you please post a link to OSH-Park for this, if you've already uploaded it to them, so that the rest of us peeps can order them, too? :cool:
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    For 4 Mb/s, why not just use block transfers over...

    For 4 Mb/s, why not just use block transfers over high speed SPI (i.e., from SPI1)?
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    Is there anything (code wise) available for using...

    Is there anything (code wise) available for using USB1 on the Teensy 3.6 as a USB device (and not host) with a full on Linux mini-computer such as Raspberry Pi 3. I want to pipe in telemetry data...
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    Would it be possible for a Teensy 3.6 to do HDMI...

    Would it be possible for a Teensy 3.6 to do HDMI out? The processor is certainly fast enough, but I am not sure what else would be needed to accomplish this (short of a full blown OS and a graphics...
  45. How fast can the 3.6 render text to the ILI9341...

    How fast can the 3.6 render text to the ILI9341 via SPI (i.e., full refreshes of all text per second)? If I wanted to display the following four lines of voltage/current readings (in different...
  46. It's definitely not like this, because, in a...

    It's definitely not like this, because, in a nutshell, the underlying circuitry is different, including protection of each circuit from the input noise (i.e., it's effective PSRR [Power Supply...
  47. Is this true even with multisampling and...

    Is this true even with multisampling and averaging? I seem to be able to get close to 15 ENOB on the Teensy 3.2 with enough oversampling (e.g. >=1024), even on a breadboard and using the crappy...
  48. On the 3.5/3.6 Kickstarter page, why are the ADCs 13-bit when they are 16-bit

    From the page:

    ...

    62 I/O Pins (42 breadboard friendly)
    25 Analog Inputs to 2 ADCs with 13 bits resolution (Should be 2 SAR ADCs with 16-bits of resolution)
    2 Analog Outputs (DACs) with 12...
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    Offset - not an issue (easy to correct in...

    Offset - not an issue (easy to correct in software)
    Noise - not sure how bad it is internal vs. external (but, external costs money and space)
    Input Z - Should be better or the same going through...
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    As has already been pointed out, I guess one...

    As has already been pointed out, I guess one would have to be very careful cutting the 5V input to the LDO for non-USB power. I am not sure how careful, because it is not clear where the trace to be...
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