Automation HAT/pHAT outputs and external power supply wiring issue

@lwi wrote:

Hi,

I am trying to use the Automation Phat to control a lighting fixture (wiki) with an external 10VDC power supply.

The wiring is as follows:

10V psu positive lead ----> positive dimmer contact
negative dimmer contact ----> Output 1 on the pHAT
10V psu negative lead ----> GND on the pHAT

is this correct? (I am not that good with electronics)

The problem I am having is that when the output pin is ON, I measure 9.5V at the dimmer’s contacts.
But when the output is OFF, I should get 0v, but I measure around 10.5V.
I measure 10v exactly at the psu’s contacts.

Before that I tried to blink a LED using the output and the 5V pin as described here:
https://learn.pimoroni.com/tutorial/sandyj/getting-started-with-automation-hat-and-phat
…and it worked perfectly fine.

I am a bit at a loss here, any insight would be appreciated.

thank you,

Lwi

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