Control Slot#5
Plug a three-wire cable into the slot #5 and make sure that the black wire is connected to the ground (or negative) terminal of a small device/accessory (e.g. LED lamp, buzzer, servo/step motor, relay switch etc.) and green wire to the power or positive terminal. Then, press keypad "C5" to toggle a high (5V) or low (0V) voltage on the device. For the first time use, you need to press "D#" to enable this slot.

Safety Remark:

The current limit for each slot is 40mA. After enabling this slot as a control, you must not plug in any sensor which will be burnt or damaged. You need to reboot or disable (D#) this slot before plugging in any sensor.