The telemetric miniaturized device, weighing less than 15 g,
consists of a single-supply sensor driver, a current-to-voltage (I/V)
converter, a microcontroller, and a miniaturized data transmitter.
It is coupled with a microsensor that generates electrical signals related
to electrochemical processes. The telemetric device is capable
of working in oxidation mode. A biological oxidizing molecule, such
as AA, can be directly detected on the surface of the amperometric
sensor connected to a potentiostat. The AA oxidation currents were
digitized by means of an analog-to-digital converter integrated in a
peripheral interface controller (PIC) and sent to a personal computer
by means of a miniaturized AM transmitter. The components
were soldered on a single sided printed circuit board. All electronic
parts used in this project were lead (Pb) free and compliant to
restriction of hazardous substances (RoHS) directives. The electronics
were calibrated and tested in vitro under different experimental
conditions and exhibited high stability, low power consumption,
and good linear response in the nanoampere current range (Bazzu
et al., 2009; Calia et al., 2009; Serra et al., 2007).