Figure 1.
A tailor-made portable biodevice for measuring conductivity. (A) The device is composed of two parts, including a PCB with a coating-free gold microelectrode sensor in the sample well and a conductivity meter with a size of 10 × 5.5 × 2.2 cm3. (B) Design of the co-planar microelectrode and the sample well. The gap between two microelectrodes is only 100 μm. (C) Electronic schematics of the fabricated conductivity meter. Abbreviations: ADC, analog-to-digital converter; C, capacitance; GND, ground; IIC, inter-integrated circuit; MCU, micro control unit; OLED, organic light-emitting diode; R, resistance; RGB, red, green, blue color model; VCC, volt current condenser.