# Interface Node-RED with arduino

**URL:** <https://discourse.nodered.org/t/interface-node-red-with-arduino/49795>\
**Category:** Hardware\
**Created:** [16 August 2021 14:20 UTC](https://discourse.nodered.org/t/interface-node-red-with-arduino/49795 "2021-08-16T14:20:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RafaelMarquesRibeiro](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/rafaelmarquesribeiro/32/46313_2.png) [@RafaelMarquesRibeiro](https://discourse.nodered.org/u/RafaelMarquesRibeiro)\
**Post date:** [16 August 2021 14:20 UTC](https://discourse.nodered.org/t/interface-node-red-with-arduino/49795/1 "2021-08-16T14:20:51Z")

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Hello!  
Im developing a project in node-red that has the input of a numbpad. I'm now trying to test it with Arduino Uno and a keypad 4x4. I´ve tried StandartFirmata and tried to modify it to work with keypad but was unsuccessful. Does anyone know of a sketch of StandartFirmata with a Keypad 4x4 included?  
Thanx for your time 😃 !!

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**Author:** ![RafaelMarquesRibeiro](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/rafaelmarquesribeiro/32/46313_2.png) [@RafaelMarquesRibeiro](https://discourse.nodered.org/u/RafaelMarquesRibeiro)\
**Post date:** [16 August 2021 16:19 UTC](https://discourse.nodered.org/t/interface-node-red-with-arduino/49795/2 "2021-08-16T16:19:22Z")

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Ok i have identified the problem. When arduino tries to send 2 signals, non of them are read! I can only receive the coloum or the row, if i try to press "1" (pins 9 and 5) and have both connected on node-red it wont receive payload, as if i only have one of them connected in Node-RED i get the one i have connected!

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [15 October 2021 16:19 UTC](https://discourse.nodered.org/t/interface-node-red-with-arduino/49795/3 "2021-10-15T16:19:53Z")

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