[GreenKeys] USB interface to ASR Mod 33 Teletype

[Steve Garrison]

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:
>  
> 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)
> https://trmm.net/Boost_converter uses a Teensy with the Adafruit DC/DC Boost circuit (last update 15-Aug-2013)
> http://avitech.com.au/?page_id=318 is a USB Powered Current Loop Interface (last updated in27-Dec-2014)
> 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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