Keep an eye on your health no matter where you are with MAX30205 and PIC18F57Q43

Fever Click is based on the MAX30205, a human body temperature sensor from Analog Devices. The sensor converts the temperature measurements to a digital form using a high-resolution (16-bit) sigma-delta analog-to-digital converter (ADC). It can be used for monitoring the body temperature, or it can be set to alert about "fever – no fever" states: the condition of the human body when the temperature is greater than 37.5℃ is considered a fever. The sensor can work in one-shot mode and shutdown mode, which helps reduce power usage. In addition, it features the selectable timeout, which prevents bus lockup and separate open-drain overtemperature shutdown (OS) output that operates as interrupt or as comparator/thermostat output. When operating as an interrupt, the

overtemperature shutdown will be asserted once the programmed threshold temperature has been exceeded. Still, it will be de-asserted when the temperature drops below the hysteresis. In this way, the sensor works as a thermostat, and in this mode, it can initiate cooling fans, automatize air conditioning, and more. In comparator mode, the polarity of the OS pin can be programmed. A special fault counter is used to avoid erratic behavior near the threshold range, where the number of faults (conditions when the temperature exceeds threshold values) is determined by the software. When the programmed number of faults is reached, the OS pin will be asserted. This way, it acts like a filter, preventing false triggering situations. Fever Click uses a standard 2-Wire I2C interface to

communicate with the host MCU, supporting a clock frequency of up to 400kHz. The I2C bus has lowpass filters applied to its pins, preventing excessive EMI from affecting communication, thus making the I2C interface on this Click board™ immune to interferences, enabling it to work even in reasonably noisy environments. This is necessary for medical equipment. The overtemperature shutdown pin is available on the OS pin of the mikroBUS™ socket. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive

mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI

GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.