# I2c: received NACK

**URL:** <https://discuss.blues.com/t/i2c-received-nack/1328>\
**Category:** Notecard API\
**Tags:** firmware-release\
**Created:** [March 16, 2023, 4:15pm UTC](https://discuss.blues.com/t/i2c-received-nack/1328 "2023-03-16T16:15:24Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![nicbkw](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/nicbkw/32/434_2.png) [@nicbkw](https://discuss.blues.com/u/nicbkw)\
**Post date:** [March 16, 2023, 4:15pm UTC](https://discuss.blues.com/t/i2c-received-nack/1328/1 "2023-03-16T16:15:24Z")

</div>

Hi, having problems with an Arduino app since I updated the notecard firmware:  
The code:

```auto
J *motionReq = nc.requestAndResponse(nc.newRequest("card.motion"));

```

sometimes gives this error:

```auto
15:41:14.277 -> {"req":"card.motion"}
15:41:14.277 -> i2c transmit: i2c: received NACK on transmit of address {io}
15:41:14.277 -> {"err":"i2c: received NACK on transmit of address {io}"}
15:41:19.535 -> {"req":"card.attn","mode":"arm,motion"}
15:41:27.751 -> invalid JSON: 
15:41:27.751 -> {"err":"unrecognized response from card {io}"}

```

my card is:

````auto
 "version": "notecard-4.1.1.4015681",
 "device": "dev:864475044242211",
 "name": "Blues Wireless Notecard",
 "sku": "NOTE-NBGL500",
 "board": "1.11",
 "api": 4,
 "body": {
  "org": "Blues Wireless",
  "product": "Notecard",
  "version": "notecard-4.1.1",
  "ver_major": 4,
  "ver_minor": 1,
  "ver_patch": 1,
  "ver_build": 4015681,
  "built": "Dec 5 2022 12:54:58"
 }
}```
Any suggestions? - thanks
````

---

<div class="post-metadata">

**Author:** ![tjvantoll](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/tjvantoll/32/231_2.png) [@tjvantoll](https://discuss.blues.com/u/tjvantoll)\
**Post date:** [March 17, 2023, 7:50pm UTC](https://discuss.blues.com/t/i2c-received-nack/1328/2 "2023-03-17T19:50:09Z")

</div>

Hey @nicbkw,

Sorry you’re having issues here. To start, could you check what version of `note-arduino` you’re using? And if it’s something older than `1.3.18` could you try upgrading and see if you’re still having the problem.

Thanks,  
TJ VanToll

---

<div class="post-metadata">

**Author:** ![nicbkw](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/nicbkw/32/434_2.png) [@nicbkw](https://discuss.blues.com/u/nicbkw)\
**Post date:** [March 20, 2023, 5:58pm UTC](https://discuss.blues.com/t/i2c-received-nack/1328/3 "2023-03-20T17:58:06Z")

</div>

Hi Tj,

Thanks for the response and sorry for my delayed reply.  
I do have notecard-arduino library version 1.3.18 installed  
FYI, I have an Adafruit BLE sense featherboard and a separate INA219 board connected to notecard I2C - could this be a pull-up issue?

---

<div class="post-metadata">

**Author:** ![zfields](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/zfields/32/29_2.png) [@zfields](https://discuss.blues.com/u/zfields)\
**Post date:** [March 22, 2023, 12:18am UTC](https://discuss.blues.com/t/i2c-received-nack/1328/4 "2023-03-22T00:18:22Z")

</div>

Hi @nicbkw,

It could be a pull-up issue, but that shouldn’t have anything to do with upgrading your firmware.

Can you send a picture of the hardware you are working with?

I tried to look up the MCU you described as, “Adafruit BLE sense featherboard”, but I didn’t have much luck. The closest thing I could find was, “Feather nRF52840 Sense (nRF52840).” As far as the INA219 goes, it’s a TI chip, but I’m guessing you also purchased it from Adafruit as the Stemma breakout.

BOM:

- [Adafruit BLE sense featherboard](https://www.adafruit.com/product/4516)
- [INA219](https://www.adafruit.com/product/904)

Have I guessed correctly? Also, it would be good to understand your power supply. If you do supply a photo, please make sure it will reveal this as well. Finally, I would like to see as much of the code as you are willing to share. The logs you provided, indicate there is more code than you originally supplied.

Thanks,  
Zak