# Arduino blink example error
**URL:** https://discourse.nodered.org/t/arduino-blink-example-error/1881
**Category:** General
**Created:** [28 July 2018 09:09 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881 "2018-07-28T09:09:17Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@hossein](https://discourse.nodered.org/u/hossein)
#### Post date: [28 July 2018 09:09 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881/1 "2018-07-28T09:09:17Z")
Hi,
I sketch the standard-firmata on my Arduino and after make blink node based on example I faced with this error: "TypeError: Cannot read property 'on' of null"
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [28 July 2018 09:26 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881/2 "2018-07-28T09:26:34Z")
Which example? Please export the part of your flow that shows the problem and paste it here.
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### Author:  [@hossein](https://discourse.nodered.org/u/hossein)
#### Post date: [28 July 2018 12:45 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881/3 "2018-07-28T12:45:39Z")
this arduino blink example `https://nodered.org/docs/hardware/arduino`
in debug this is error: TypeError: Cannot read property 'on' of null
and in cmd :[error] [arduino out:47fa459b.750dfc] TypeError: Cannot read property 'board' of null
[arduino out:47fa459b.750dfc] TypeError: Cannot read property 'board' of null
I think I should add device name but I dont know how. this is wemos D1 R2
thanks
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### Author:  [@davidcgu](https://discourse.nodered.org/u/davidcgu)
#### Post date: [28 July 2018 12:52 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881/4 "2018-07-28T12:52:32Z")
> [@hossein](#):
>
> [Redirecting…](https://nodered.org/docs/hardware/arduino)
1- have you flashed standard firmdata on the arduino board and connected through USB?
2- Have you defined the proper port of your arduino board on the node red arduino node?
Regards
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### Author:  [@hossein](https://discourse.nodered.org/u/hossein)
#### Post date: [28 July 2018 12:54 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881/5 "2018-07-28T12:54:02Z")
yes a flashed standard firmdata and also select com4 in arduino node
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### Author:  [@davidcgu](https://discourse.nodered.org/u/davidcgu)
#### Post date: [28 July 2018 12:54 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881/6 "2018-07-28T12:54:57Z")
Are u under windows?
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### Author:  [@hossein](https://discourse.nodered.org/u/hossein)
#### Post date: [28 July 2018 12:56 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881/7 "2018-07-28T12:56:03Z")
I tried both windows and linux
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### Author:  [@davidcgu](https://discourse.nodered.org/u/davidcgu)
#### Post date: [28 July 2018 13:25 UTC](https://discourse.nodered.org/t/arduino-blink-example-error/1881/8 "2018-07-28T13:25:21Z")
I'm using raspbian and frankly speaking I don't know exactly what your problem is because the steps are really simple:
1- install arduino node on node red.
2- flash standard firmdata on arduino board and plug to USB
3- define your usb port on some arduino node
And directly works, I have being never able to use jhonny-five and I don't know why but directly use the arduino board as simple in/out is very easy.
Re-check the steps I told you....
Regards