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60 mA at +/- 1.5V on GPIO on a NUCLEO-L053R8

Question asked by Citron on Oct 30, 2015
Dear all,
I am a beginner and my questions may seem stupid, so please understand.

Using mbed, I would like to program a NUCLEO-L053R8 evaluation board. 
The goal is to deliver 60mA@1.5V on a group of GPIO and change its polarity every 30s, without using any external voltage divider.
My problem is that a GPIO in binary mode outputs 3V.

How can I solve my problem? Thanks in advance.

( Did-n't I say that the question was stupid? )