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behaviour, otherwise Witty Pi 3 doesn’t know when the system is off, and can not fully cut the

power.

GPIO-2 and GPIO-3 are for I

C communication between Raspberry Pi and the RTC chip (DS3231).

C devices are identified by I

C address, and they can share the I

C pins as long as they have

different I

C addresses.

Is Witty Pi 3 Compatible with “Other Hardware”?

We have got a lot of emails asking this question, with the “Other Hardware” replaced by different

kinds of hardware.

Please understand that we might not have the hardware you have on hand, and even if we have, it is

difficult for us to make tests on all these hardware with Witty Pi 3. Fortunately, it is not that difficult

to figure out the answer by yourself. Basically you just need to consider the I

C address and GPIO

pins used by the “Other Hardware”.

If the “Other Hardware” uses 0x68 I

C address, it will be a confliction with Witty Pi’s RTC chip and

you can not use it with Witty Pi together. If the “Other Hardware” uses 0x69 I

C address, you will

need to change the I

C address used by Witty Pi’s micro controller, and change the software

accordingly.

If the “Other Hardware” doesn’t use any GPIO pin that used by Witty Pi, and it doesn’t use 0x68 or

0x69 I

C address, then it should be compatible with Witty Pi.

If you have no idea which I

C address (if applicable) or GPIO pins are used by the “Other

Hardware”, please contact its developer, as they certainly know their hardware and can provide you

accurate information about it.

Witty Pi 3 does not boot?

Some customers meet the situation that Witty Pi 3 only boot Raspberry Pi for a few seconds, and

then shutdown Raspberry Pi or cut the power directly.

Remarks: you may need to disconnect Witty Pi 3 from your Raspberry Pi, and power on Raspberry

Pi only for troubleshooting.

There are some possible reasons that can cause this kind of problem:

1. 1-Wire interface is enabled on GPIO-4, which conflicts with Witty Pi

If you have 1-Wire interface enabled, by default it will use GPIO-4. Because Witty Pi uses GPIO-4

pin to receive shutdown command, this will bring confliction and Witty Pi will shut down your

Raspberry Pi after every boot. You won’t even have chance to login the system.

UUGear Witty Pi 3 User Manual

Questions and Answers: