Ewod device with sensing apparatus

A non-transitory computer-readable medium storing program code which is executed by a processing device for controlling operation of an electro-wetting on dielectric (EWOD) device, the EWOD device having first and second substrates defining a fluid chamber therebetween, a plurality of electro-wetting electrodes on the first substrate, and at least one bias electrode and at least two sensing electrodes on the second substrate,

• the program code being executable by the processing device to perform the steps of:
• controlling a voltage source to apply a first bias voltage to a first bias electrode and applying a second bias voltage to a second bias electrode;
• operating one of the at least two sensing electrodes to sense a first current flowing between the first bias electrode and the one of the at least two sensing electrodes via a first fluid package electrically coupled to the first bias electrode and the one of the at least two sensing electrodes;
• and
• operating another of the at least two sensing electrodes to sense a second current flowing between the second bias electrode and the another of the at least two sensing electrodes via a second fluid package electrically coupled to the second bias electrode and the another of the at least two sensing electrodes.