# What node can using for ReSpeaker 2 Mic Array Pi HAT v1.0

**URL:** <https://discourse.nodered.org/t/what-node-can-using-for-respeaker-2-mic-array-pi-hat-v1-0/27292>\
**Category:** General\
**Created:** [26 May 2020 05:51 UTC](https://discourse.nodered.org/t/what-node-can-using-for-respeaker-2-mic-array-pi-hat-v1-0/27292 "2020-05-26T05:51:29Z")\
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**Author:** ![JGKK](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/jgkk/32/18515_2.png) [@JGKK](https://discourse.nodered.org/u/JGKK)\
**Post date:** [28 May 2020 14:33 UTC](https://discourse.nodered.org/t/what-node-can-using-for-respeaker-2-mic-array-pi-hat-v1-0/27292/19 "2020-05-28T14:33:02Z")

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Yes because the watson stt node expects a single wav buffer object but straight from the mic node you get raw pcm audio chunks as a stream of buffers. So you need to join the buffers and add wav headers to it. You will need to install [https://flows.nodered.org/node/node-red-contrib-wav](https://flows.nodered.org/node/node-red-contrib-wav) in nodered.  
Than import this flow:

```auto
[{"id":"c4303dc0.528f58","type":"Mic","z":"20693e98.c7fb2a","name":"","outputPayloadType":"buffer","endian":"little","bitwidth":"16","encoding":"signed-integer","channels":"1","device":"plughw:1,0","rate":"16000","silenceTimeout":"","exitOnSilence":"false","debug":"false","active":true,"x":350,"y":100,"wires":[["e57e38ee.a8f43","d850d294.9c4298"]]},{"id":"78a41c6d.53ef14","type":"inject","z":"20693e98.c7fb2a","name":"","topic":"","payload":"start","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":190,"y":100,"wires":[["c4303dc0.528f58"]]},{"id":"1948e4b1.02c3ab","type":"inject","z":"20693e98.c7fb2a","name":"","topic":"","payload":"stop","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":190,"y":160,"wires":[["c4303dc0.528f58"]]},{"id":"6184fc9.0b92e84","type":"join","z":"20693e98.c7fb2a","name":"","mode":"custom","build":"buffer","property":"payload","propertyType":"msg","key":"topic","joiner":"","joinerType":"str","accumulate":false,"timeout":"","count":"","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":810,"y":100,"wires":[["97a658a2.a84b2"]]},{"id":"e57e38ee.a8f43","type":"switch","z":"20693e98.c7fb2a","name":"data?","property":"event","propertyType":"msg","rules":[{"t":"eq","v":"data","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":490,"y":100,"wires":[["6184fc9.0b92e84"]]},{"id":"d850d294.9c4298","type":"switch","z":"20693e98.c7fb2a","name":"end?","property":"event","propertyType":"msg","rules":[{"t":"eq","v":"end","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":490,"y":160,"wires":[["50230b1c.19d63c"]]},{"id":"50230b1c.19d63c","type":"change","z":"20693e98.c7fb2a","name":"complete","rules":[{"t":"delete","p":"payload","pt":"msg"},{"t":"set","p":"complete","pt":"msg","to":"true","tot":"bool"}],"action":"","property":"","from":"","to":"","reg":false,"x":640,"y":160,"wires":[["45162dad.2ec70c"]]},{"id":"45162dad.2ec70c","type":"delay","z":"20693e98.c7fb2a","name":"","pauseType":"delay","timeout":"100","timeoutUnits":"milliseconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":810,"y":160,"wires":[["6184fc9.0b92e84"]]},{"id":"97a658a2.a84b2","type":"wav-headers","z":"20693e98.c7fb2a","name":"","action":"add","channels":1,"samplerate":"16000","bitwidth":16,"x":990,"y":100,"wires":[["5a15fd13.012ffc"],[]]},{"id":"5a15fd13.012ffc","type":"debug","z":"20693e98.c7fb2a","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":1190,"y":100,"wires":[]}]

```

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/6/660b63fcc3f22bc97bee0bf19537b4319a3dfcf9.jpeg)  
This will give you a single wav buffer once you stop recording. You should be able to feed this straight into the watson stt node as according to this [example](https://github.com/watson-developer-cloud/node-red-labs/blob/master/basic_examples/speech_to_text/README.md#3-on-a-stand-alone-system) it accepts wav data passed in as a buffer which this is.

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