[GreenKeys] USB interface to ASR Mod 33 Teletype

[Mike Douglas]

You can run the ASR 33 with a current loop to RS-232 adapter and then connect RS-232 to your Android device with a Bluetooth to RS-232 bridge like https://buy.serialio.com/collections/frontpage/products/bluesnap-smart-bluetooth-4-0-ble-to-rs232-adapter?gclid=EAIaIQobChMIlJDYvfzE3AIVCQ5pCh0ozQuPEAAYASAAEgJQRPD_BwE

Mike

> On Jul 28, 2018, at 10:22 PM, <john at toebes.com> <john at toebes.com> wrote:
> 
> 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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