Single plate electrowetting on dielectric biochip

Electrowetting is well known method for microfluidic technology that plays a critical role in lab-on-a-chip systems by delivering chemical or biological samples. Once electrical potential is applied, the contact angels change and driving the droplet. In this report, a single-plate electrowetting on dielectric (EWOD) was fabricated and tested, containing both the control and ground square-shaped electrodes on one plate with dimension of 2 mm width and 2 mm long, fabricateded by thin film deposition methods and micromolding process. For droplet transportation, we designed electrical circuits using a microcontroller to control relays that switching voltage applied to control electrodes on and off. Interfacing RS232 with microcontroller makes the droplet transporting can be modified from personal computer by sending commands from a PC to a microcontroller.