PureData: WirelessConnections Wireless Connections Soon after some introductory patching, a Pd user will soon discover the slight inconvenience of connection lines running over objects to reach other objects. Luckily, there's a solution. Using the send and receive objects data can be sent from one part of the patch to another without connecting lines.

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These objects can also send data to other windows. The send and receive objects need an argument to identify each other. This argument is usually in the form of a word.

Open the example “arduino-test.pd” Pure Data patch you copied over earlier. It should look like this one The test patch has everything we need to open a connection and enable pins. Firstly, lets delete a bunch of stuff and make our window a bit bigger. Hit Command + E to enter edit mode in Pure Data.

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In the above example, [metro 1500] generates bangs at the interval of 1.5 second (1500ms) and is sending the data to the [send beat] object. This in turn sends the data to the [receive beat] object.

A single send object can be received by multiple receive objects. The bangs in the above example are picked up by each [receive beat] object because they all have the same argument - 'beat'. There is no limit to the number of sends and receives with same argument.

It is possible to have many sends. Just add to the example above more [metro] objects: What kind of data can be sent? [send] and [receive] are for control data - messages, symbols, lists. For audio signals a 'tilde' version of these objects are needed. [send~] and [receive~] can be used to receive a single audio signal at many places. This example shows audio sends used to create a multitap delay: Throw and Catch In the above example you may notice that outputs from delay lines are not sent with [send~] back to [r~ out].

Audio signals can only have one [send~] but many [receive~]. While there are technical reasons for this difference, a handy pair of audio objects that can help to achieve many-to-one sends are [throw~] and [catch~]. Many [throw~]s can send audio signals to one [catch~]. Using [catch~] it is possible to further control and process audio (i.e.: volume control, VU metering, limiting, reverbs, etc.). Coincidentally, all objects we described above ([send], [receive], [send~], [receive~], [throw~], [catch~], as well as [delwrite~] and [delread~]) all work across different patches, subpatches and abstractions.

In conclusion, the objects described above are powerful tools to not only send and copy data and audio around a single patch without messy connections, but to create connections between individual patches, subpatches and abstractions. A word of warning though: the arguments passed to these objects are always global - they are accessible from all patches and abstractions opened in a single Pd session.

This simply means that a situation can arise with unwanted 'crosstalk' of data or multiplies defined. Care has to be taken on names of arguments, while at the same time a technique exists to localize arguments using dollarsigns.