# ZymKey problem when reading MCP3008

**URL:** <https://community.zymbit.com/t/zymkey-problem-when-reading-mcp3008/1020>\
**Category:** ZYMKEY4\
**Created:** [November 19, 2020, 6:02pm UTC](https://community.zymbit.com/t/zymkey-problem-when-reading-mcp3008/1020 "2020-11-19T18:02:36Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Bob\_of\_Zymbit](https://avatars.discourse-cdn.com/v4/letter/b/82dd89/32.png) [@Bob\_of\_Zymbit](https://community.zymbit.com/u/Bob_of_Zymbit)\
**Post date:** [November 19, 2020, 7:04pm UTC](https://community.zymbit.com/t/zymkey-problem-when-reading-mcp3008/1020/2 "2020-11-19T19:04:05Z")

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@rpiMike - Yes the 8 flashes is a comm problem on i2c.

The first question we always have to ask is do you have a good power supply?

Next, can you try changing the PI CPU scaling governor from **ondemand** to **performance** to see if that makes a difference? Details here:

[https://community.zymbit.com/t/dev-team-known-issues/996/3](https://community.zymbit.com/t/dev-team-known-issues/996/3)

And one more question on your setup: How is your MCP3008 wired up? Is it on a standard HAT, or are you wiring up yourself on a breadboard?

Bob

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