[GreenKeys] USB interface to ASR Mod 33 Teletype

Sun Jul 29 14:29:33 EDT 2018

Hi guys,  sorry i haven't responded sooner but i'm traveling this week. 
I don't have any more pre built boards but i do have a few blanks and the cad files are freely available so they could be made very cheaply.  For driving a 33 you don't really need the majority of the software running on the cpu on my board since it's already ascii but it should still work.  

On July 29, 2018 2:02:21 PM EDT, Jordan Spencer Cunningham <js at cunni.co> wrote:
>Hi John,
>
>I recently built a few of Eric Volpe's boards (from Heepy.net) and have
>been writing scripts with which to run my machines from Raspberry Pi.
>Not
>having tried any of the others, I'd highly recommend it. If you're
>familiar
>with writing software for Android to utilize its Linux underpinnings
>and
>drive a serial interface via USB, then I wager you have the skills to
>program something to communicate with any of these interfaces. It's
>certainly much easier to connect it up to something like a Raspberry Pi
>or
>the like, but it sounds like you might already have a lot of the custom
>legwork required to go from an Android device. This being said, I have
>utilized my Android phone via USB to both tether my cellular connection
>to
>my Raspberry Pi to provide internet for my teletypes and to SSH into my
>Raspberry Pi for control. It's effectively running TCP/IP over USB. Not
>all
>phones support this out of the box, though.
>
>I've very much liked Eric's design. It's versatile and has served me
>well.
>It requires an external power supply, so as long as that's doable, it
>works
>out great. John Nagle has a newer board based on USB rather than RS-232
>that uses some clever engineering to power the current loop only using
>the
>5V supplied by USB. That wouldn't work being driven straight from an
>Android phone, though. You'd have to pass through something that could
>supply the power needed to drive the loop. I haven't yet gotten my
>hands on
>one of these, but I hope to have one soon.
>
>https://github.com/John-Nagle/ttyloopdriver
>
>I have been planning to do a manufactured run of Eric's design for
>GreenKeys. However, since I'm preparing for another fair at which to
>run my
>machines in September and then moving into a temporary home while our
>new
>one is being built shortly after, among a dozen other things, I highly
>doubt I'll find the time to make it happen until next year.
>
>--Jordan
>
>On Sun, Jul 29, 2018, 6:52 AM john at toebes.com <john at toebes.com> wrote:
>
>> You know, I didn’t get a chance to check the interface before it got
>sent
>> off to Wayne for some needed TLC.
>>
>> I’m not afraid of building on a proto board, I have plenty of the
>Adafruit
>> proto boards to populate, but I figured I would check with the list
>for
>> advice first.
>>
>> Thanks!
>>
>> Sent from my iPad
>>
>> On Jul 29, 2018, at 8:17 AM, Steve Garrison <steve.n4tty at gmail.com>
>wrote:
>>
>> John, I would have to still agree with Dave, but if you could get it
>to
>> work I would think #4 might be your best bet.  Although I have zero
>> experience with #2 or #3.  Others with experience with 2 & 3 please
>chime
>> in.
>>
>> Eric hasn't made any of the #4 board in a good while now so you'll
>have to
>> find someone that would be will to let go of one.  Plus the board was
>> designed to use a current loop, so you would have to take that into
>account
>> as well.
>>
>> And is your ASR 33 setup for current loop?
>>
>> Steve G./N4TTY
>> Sent from my iPhone
>>
>> On Jul 29, 2018, at 7:31 AM, <john at toebes.com> <john at toebes.com>
>wrote:
>>
>> I wouldn’t worry about software for Andriod.. We have that covered,
>our
>> robotics team drives their robots over USB using custom software.  As
>it
>> turns out, WiFi while interesting is not an option as we are not
>allowed to
>> have any WiFi devices at competitions where we would be showing off
>the
>> Teletype.
>>
>>
>>
>>    - John
>>
>>
>>
>> *From:* Dave Wade <dave.g4ugm at gmail.com>
>> *Sent:* Sunday, July 29, 2018 4:24 AM
>> *To:* john at toebes.com; greenkeys at mailman.qth.net
>> *Subject:* RE: [GreenKeys] USB interface to ASR Mod 33 Teletype
>>
>>
>>
>> John,
>>
>>
>>
>> I am not sure any of these will work with an Android Phone. The USB
>on
>> Android Phone or Tablet is usually a device port for connecting it
>phone.
>> You can get an OTG cable but then you need software that has Android
>> drivers for the serial interface you are using. What software were
>you
>> going to use on the phone to drive the Model 33? My preference would
>be for
>> an ESP8266 board so I could connect vi WiFi but it would need a TTL
>to
>> Current Loop…
>>
>>
>>
>> Dave
>>
>> G4UGM
>>
>>
>>
>> *From:* greenkeys-bounces at mailman.qth.net <
>> greenkeys-bounces at mailman.qth.net> *On Behalf Of *john at toebes.com
>> *Sent:* 29 July 2018 04:22
>> *To:* greenkeys at mailman.qth.net
>> *Subject:* [GreenKeys] USB interface to ASR Mod 33 Teletype
>>
>>
>>
>> Hi All,
>>
>>   I’m looking at the best way to connect an Android Phone (USB) to a
>ASR
>> Mod 33 teletype.  To the best of my knowledge, I have found 4
>possible
>> interface circuits:
>>
>>
>>
>>    1. http://aetherltd.com/connectingusb.html Connects a Silicon
>>    Laboratories CP2102-EB to a second Teletype to RS-232 board
>(Designed for
>>    Teletype Model 15 with Baudot)
>>    2. https://trmm.net/Boost_converter uses a Teensy with the
>Adafruit
>>    DC/DC Boost circuit (last update 15-Aug-2013)
>>    3. http://avitech.com.au/?page_id=318 is a USB Powered Current
>Loop
>>    Interface (last updated in27-Dec-2014)
>>    4. http://heepy.net/images/8/8b/Usbtty-instructions.pdf  /
>>    http://heepy.net/index.php/USB-teletype USB Serial Teletype Loop
>>    Adapter posted to Greenkeys April 2016
>>
>>
>>
>> I’m interested in finding out from people which (if any) people are
>using
>> and what is the most resilient (or if there are other solutions I
>should
>> look at).
>>
>> Thanks!
>>
>>    - John
>>
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