# Start Flowgraph Signal Processing at Runtime

**URL:** <https://www.ruby-forum.com/t/start-flowgraph-signal-processing-at-runtime/234251>\
**Category:** GNU Radio\
**Created:** [February 18, 2015, 7:18pm UTC](https://www.ruby-forum.com/t/start-flowgraph-signal-processing-at-runtime/234251 "2015-02-18T19:18:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [February 18, 2015, 7:18pm UTC](https://www.ruby-forum.com/t/start-flowgraph-signal-processing-at-runtime/234251/1 "2015-02-18T19:18:03Z")

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Hi all,

I want autostart=off in the options block so I can start a flowgraphs  
GUI  
environement, allow the users to configure settings and then start the  
flowgraph signal processing. For example, let the user choose whether  
the  
receiver should decode BPSK or QPSK at runtime.

My question is, how do I start the signal processing at runtime when the  
autostart option is off?

Thanks,  
Rich