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  • Epyon's Avatar
    Today, 09:32 AM
    A BAT54S contains two Schottky series diodes with a center tap, but it is only available in SMD.
    5 replies | 84 view(s)
  • Epyon's Avatar
    Yesterday, 08:55 PM
    It of course depends on what exactly you want to protect your analog inputs from, but I can confirm that this circuit successfully protects T3.2 analog inputs from regular accidental overvoltages, provided you use...
    5 replies | 84 view(s)
  • Epyon's Avatar
    Yesterday, 10:05 AM
    I recommend against an opamp circuit. Most opamps are unstable at gains less than 1 and it reduces bandwidth and slew rate. In general opamps make for bad attenuators. Your gain will also depend on the temperature...
    6 replies | 113 view(s)
  • Epyon's Avatar
    Yesterday, 12:15 AM
    For this I can advice the MOCD208. I use it in all my designs that interface with 24V logic. The main advantage of the MOCD208 is its high CTR. With the resistor value in the schematic above, I can interface with...
    8 replies | 338 view(s)
  • Epyon's Avatar
    11-14-2017, 12:12 PM
    Search the forum for 'Teensy OTA'. There are some makeshift solutions available, but non really recommended for production. My solution is to combine them with a Linux SBC, e.g. the very compact $9 NanoPi Neo, and...
    3 replies | 276 view(s)
  • Epyon's Avatar
    11-14-2017, 10:01 AM
    You never 'need' to use Arduino libraries. You can write everything from scratch if you really want to. Wouldn't recommend it, because you would be doing loads of redundant work with next to no gains. It's highly...
    8 replies | 2052 view(s)
  • Epyon's Avatar
    11-05-2017, 01:03 AM
    So Freescale was acquired by NXP. Then NXP was acquired by Qualcomm. Now Qualcomm is to be acquired by Broadcom. If acquirements lead to acquirements, where will the chain of acquirements end? :rolleyes:
    11 replies | 2051 view(s)
  • Epyon's Avatar
    11-03-2017, 12:02 AM
    Epyon replied to a thread Arduino or C in General Discussion
    I think it depends on what you want to accomplish. If you want to become a C(++) programmer, start with that. If you want to start developing applications on the Teensy or Arduino platform, start with Arduino and switch...
    8 replies | 553 view(s)
  • Epyon's Avatar
    10-28-2017, 02:52 PM
    There are probably a dozen boards combining processor power such as found in the RPi3 (or even ten times more) with embedded Arduino with all the library support. UDOO being the most common I think (now also available...
    103 replies | 19401 view(s)
  • Epyon's Avatar
    10-26-2017, 05:26 PM
    For what it's worth, I once faced a similar problem with a datalogging application. I investigated the possibility of putting SD write access in another thread, but abandoned the idea because of non-deterministic...
    4 replies | 257 view(s)
  • Epyon's Avatar
    10-25-2017, 10:09 PM
    Is the SD card connected directly to the ILI9341, or can you use any SPI connected SD?
    9 replies | 783 view(s)
  • Epyon's Avatar
    10-25-2017, 06:18 PM
    The Adafruit version has a micro SD on the back?
    9 replies | 783 view(s)
  • Epyon's Avatar
    10-25-2017, 10:02 AM
    There's a disclaimer about that in their announcement. Initial support for autocompletion (activate it using CTRL+space) Attention: Launching for the first time is quite slow and will freeze the UI. Don’t...
    66 replies | 8880 view(s)
  • Epyon's Avatar
    10-24-2017, 10:21 AM
    The 3.3V pin below AGND is closest to the LDO. It's best to connect and place components drawing large currents closer to that pin, especially if only using one 3.3V pin. Connecting all GND pins to one low-impedance...
    5 replies | 359 view(s)
  • Epyon's Avatar
    10-20-2017, 12:03 AM
    But does the Pi Zero has deterministic low-level I/O usable without an OS and additional peripherals like external RAM? As far as I can see the i.MX RT is still a microcontroller while the RasPi is a microcomputer.
    103 replies | 19401 view(s)
  • Epyon's Avatar
    10-18-2017, 09:07 AM
    The TXB level shifters don't work well with pull-ups and open drain, and are generally a bad idea in almost any use case (and I expect pretty much the same from the TXS). The forum (and that of TI) is full of bad...
    12 replies | 1022 view(s)
  • Epyon's Avatar
    10-16-2017, 03:30 PM
    Please try first with the Ethernet library that ships with Teensyduino. It is also more optimised. The NBEthernet library doesn't play so well with the W5500 and some routers.
    8 replies | 564 view(s)
  • Epyon's Avatar
    10-16-2017, 10:52 AM
    Okay thanks. I was under the impression that the CAN standard only described the physical media access, like the serial RS standards I'm used to, but apparently it also describes the data link. I've ordered the parts...
    7 replies | 533 view(s)
  • Epyon's Avatar
    10-15-2017, 10:09 AM
    I understand, but how does the hardware (or the library) know the format and size of the message? Afaik there isn't any global standard for this. E.g. my HA system probably uses its own proprietary message format, and...
    7 replies | 533 view(s)
  • Epyon's Avatar
    10-14-2017, 03:08 PM
    Thanks a lot for the information! The concept of 'mailboxes' seems a bit strange to me. This would suggest the library already interprets the messages on the bus in some way, in stead of just relaying every bit on the...
    7 replies | 533 view(s)
  • Epyon's Avatar
    10-12-2017, 10:10 PM
    For my next project, I'm trying to build I/O modules that are compatible with my home automation system which uses CAN bus. All modules have an 8 bit address. Input modules put messages on the bus when certain actions...
    7 replies | 533 view(s)
  • Epyon's Avatar
    10-12-2017, 12:51 PM
    Because the 3.2 boards don't have the Ethernet MAC integrated. They rely on an external chip implementing it. The 3.5/6 only need the analog stuff like the magnetics and the PHY, which you will always need separately...
    8 replies | 564 view(s)
  • Epyon's Avatar
    10-12-2017, 12:24 PM
    The thread links to other threads, threads that you would also have found with the search function ;) . The specs page is correct. The Ethernet portion clearly states: "A special shield is required to connect an...
    8 replies | 564 view(s)
  • Epyon's Avatar
    10-12-2017, 12:03 PM
    Please use the search, which results in threads like these almost instantly. The native Ethernet support is still very experimental and besides some basic UDP stuff can't do much right now. If you want to join the...
    8 replies | 564 view(s)
  • Epyon's Avatar
    10-12-2017, 11:53 AM
    Arduino has released a sketch preprocessor that parses any Arduino style sketch into valid C++. By then using Arduino builder this should allow anyone to use almost any IDE to program an Arduino, correct? Paul: how...
    66 replies | 8880 view(s)
  • Epyon's Avatar
    09-25-2017, 07:41 PM
    No, I also don't have any 2.0 hardware. But because it is based on AVR, you can probably use the standard version of the library with minimal editting.
    8 replies | 2922 view(s)
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Use British English. It's the sensible thing to do.
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