[amsat-bb] Re: APRS & Twitter

Rizwan 'Drake' Merchant kommandantdrake at gmail.com
Wed Jul 10 08:02:43 PDT 2013

Hi Henk,

CAPE-2 is the second satellite from the Cajun Advanced Picosatellite
Experiment. We are planning to fly a digipeater, text to speech
module, voice repeater and VHF and UHF radios. I am currently
developing software to distribute to you guys later this year that
will copy our telemetry and have it automatically sent back to us.

We have already implemented the ability to send APRS emails, but would
now like to do the same with twitter.
Rizwan Merchant
Call Sign: KF5BNL

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On Wed, Jul 10, 2013 at 1:52 AM, PA3GUO <pa3guo at upcmail.nl> wrote:
> Hi Rizwan,
> First of all: we are all very interested in your CAPE-2 project.
> Would you be able to share some more information on CAPE-2 ?
> In case you involve radio-amateurs in capturing telemetry/data from your satellite you will have an huge increase in coverage, as we are spread across the entire globe. We do have the APRS system up-and-running, and NO-44 (PCSAT-1) and ISS-APRS data packets for example are monitored and automatically forwarded to the internet already.
> On messaging to twitter email:
> In case of a malfunction or wrong software setting the satellite may not be able to change its transmission pattern, when it is in space and cannot be reached anymore (e.g. up-link broken). Alternative would be to break it up in two steps:
> Step 1
> Transmit a status in APRS format, and have that captured/received as regular packets. Here is for example how all the ISS data (real-time) looks like: http://www.ariss.net, and here is how NO-44 looks like: http://www.findu.com/cgi-bin/pcsat.cgi
> Step 2
> Have a software program running that looks at the the received APRS telemetry, and derive from that a Twitter tweet (every hour, every day, ...). For example if the telemetry says: "CAPE 012000105" this could mean I am alive and battery voltage is 10.5 volt and temperature is 12 degrees Celsius. The tweet could be: "Hi this is CAPE-2 in space, I feel cold (12C) and my battery is good (10.5V)".
> Just a thought.
> Regarding APRS email: http://www.aprs.org/aprs-messaging.html explains how to do this.
> Here is an example on how this worked on ANDE-1:
> ANDE-1 digipeat:
> !T 12:26:38 PA3GUO-8>APRS,ANDE-1*,qAO,PE1ITR::email     :pe1itr at spamsat.org  Hi ROb
> !S 12:26:36 :email     :pe1itr at spamsat.org  Hi ROb
> Here an example on how this worked on ISS:
> TNC settings an email to PE1ABC (pe1abc at spamsat.org) via ISS (RS0ISS-3):
> BTEXT  :EMAIL     :pe1abc at spamsat.org Hi there!
> The result (the email received by pe1abc):
> From: ksproul at rci.rutgers.edu
> Date: 25-02-2004 08:00
> To: pe1abc at spamsat.org
> cc:
> Subject: APRS Message from PA3GUO-5
> Hi there!
> Please let us know if this helped & success with CAPE-2!
> Henk, PA3GUO
> www.pa3guo.com
>>Greetings AMSAT!
>> I am one of the software engineers on the CAPE-2 Cubesat project at
> the University of Louisiana at Lafayette. I am interested in
> information on how to set up our satellite to tweet over APRS to a
> specific twitter account.
> For example:
> If i want our satellite to tweet once a day what our satellite's
> status is, and have it be posted to a CAPE-2 twitter account, how can
> i make this happen? We've seen other groups do it, and we are
> wondering how to replicate this.
> Thanks for your help!
> Sincerely,
> Rizwan Merchant
> Call Sign: KF5BNL
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