# Arduino, Adafruit board help
**URL:** https://discourse.processing.org/t/arduino-adafruit-board-help/4964
**Category:** Electronics (Arduino, etc.)
**Created:** [October 28, 2018, 9:56pm UTC](https://discourse.processing.org/t/arduino-adafruit-board-help/4964 "2018-10-28T21:56:48Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@tefa](https://discourse.processing.org/u/tefa)
#### Post date: [October 28, 2018, 9:56pm UTC](https://discourse.processing.org/t/arduino-adafruit-board-help/4964/1 "2018-10-28T21:56:48Z")
Hello dear processors, so I have bought this [pulse-room](https://learn.adafruit.com/pulse-room/overview) kit. I followed all the steps that appear [here](https://learn.adafruit.com/pulse-room/code) and when I verify the code an error appears that says : invalid conversion from ‘void (_)(tc\_module_)’ to ‘void (\*)()’ [-fpermissive]
Any one has an Idea of what could be the nature of this?
The highlighted error is on the line that says `zt4.setCallback(true, TC_CALLBACK_CC_CHANNEL0, Timer4Callback0); // set DAC in the callback`
---
### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [October 31, 2018, 5:35pm UTC](https://discourse.processing.org/t/arduino-adafruit-board-help/4964/2 "2018-10-31T17:35:07Z")
I’m not sure. It sounds like this might be a question for the guide author, Collin?
[https://learn.adafruit.com/users/collinmel](https://learn.adafruit.com/users/collinmel)
---
### Author:  [@tefa](https://discourse.processing.org/u/tefa)
#### Post date: [November 1, 2018, 1:16am UTC](https://discourse.processing.org/t/arduino-adafruit-board-help/4964/3 "2018-11-01T01:16:31Z")
I have e-mailed him and he re-directed me to a forum. A forum that I signed in but has no option to start a topic, I did find a one ope (that seems closed because I did ask my question but no one replayed) topic about the same set-up I bought but with a different problem that I am having.