[Unit]
Description=configure the GPIO pins

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/bin/gpio mode 27 in
ExecStart=/usr/bin/gpio mode 27 tri
ExecStart=/usr/bin/gpio mode 28 out
ExecStart=/usr/bin/gpio write 28 0

[Install]
WantedBy=multi-user.target