Simulation of a Generalized Bandpass Filter using STM32 for Fabrication of Sensor to Detect Red Palm Weevil

The STM32F103C6T6A, also called the "Blue Pill" is a low-cost machine with 32-bit ARM Cortex-M3 RISC core designed by STMicroelectronics for beginners to build and test prototypes [8]. It is intended to use this development board for the simulation of a Bandpass Filter. To simulate a filter, the internal timer [4] clock of the board has been utilised which helps in generating signals of any frequency by manipulating the values of the Auto-Reload Register (ARR) and the Prescaler (PSC) [4]. The principle behind this filter replication is based on the frequency ratio. When the timer generates an input signal of a particular frequency, the ratio of the frequency of the timer clock to the frequency of the generated signal is calculated. If the ratio comes under the permissible value, the signal is acquired. If not, the signal experiences attenuation. Pulse Width Modulation (PWM) is an application of timer [9] which generates a PWM signal whose duty cycle can be adjusted using the Compare-Capture Register (CCR).The results are observed by generating PWM signals of passband and stopband frequencies with a constant duty cycle of 50%. Suppose the input signal is in the range of passband frequency, it would be indicated by a green Light Emitting Diode (LED), after which the signal is allowed without attenuation. If not, a red LED glows indicating that the frequency belongs to Stopband frequency, and gets attenuated. The designed band pass filter is used for developing a sensor for pest management and detection using its frequency