Mikroe Fever Click - Human Body Temperature Sensor - MAX30205

  • Product ID: 7748
  • MPN: MIKROE-2554
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Description

These features, along with the convenient design of the Click board™ keeping the sensor itself away from any PCB thermal sources, allow simple use of the device and easy development of various applications. Fever click is a perfect solution for development of health related applications, especially when combined with other health-related Click boards™. It can be used either for monitoring of the body temperature, or it can be simply set to alert about "fever – no fever" states: condition of the human body when the temperature is greater than 37.5 ℃, is considered a fever.

How does it work?

The main active component of Fever click is the MAX30205, an integrated human body temperature sensor from Maxim Integrated. This sensor is specifically designed to be used as the human body temperature sensor, featuring accuracy that complies with the clinical thermometry specifications of the ASTM E1112 standard. The sensor is most accurate in the region of 37 to 39 , with the least mean error in this area. The overall accuracy of the sensor is greatly affected by the temperature of the PCB itself since the sensor measures its die temperature. Therefore, the PCB of the Fever click has such shape that the sensor is physically moved away from any other thermal source, and the PCB under the sensor is small enough, reducing the overall thermal inertia. The temperature is sampled with the 16-bit sigma delta A/D converter, and thermal data is delivered via the I2C bus, with 0.00390625 °C per LSB.

The Click board™ exposes the I2C interface and the OS pin on the mikroBUS™, making it very simple to use. I2C pins are routed to the appropriate I2C pins of the mikroBUS™, equipped with the required pull-up resistors. The OS pin is also an open drain output, which can work in two modes: it can be used as the interrupt, or as the thermostat/comparator.

When operating as an interrupt, the OS pin will be asserted once the programmed threshold temperature is exceeded (TOS register). It won't be de-asserted until any of the registers is read by the host MCU. Again, it will be asserted next time the threshold is exceeded, reset when a register is read, and so on.

When working as the comparator/thermostat, the OS pin will be asserted once the programmed thermal threshold has been exceeded (TOS), but it will be de-asserted when the temperature drops below the hysteresis, set in the THYST register. The nature of this mode is similar to an operation of a thermostat, so this mode can be used to initiate cooling fans, automatized air conditioning, and so forth.

The OS pin mode is determined by the state of the CMP/INT bit in the config register. A logic 0 will set the comparator mode. The polarity of the OS can also be programmed, and it is determined by the OS POLARITY bit of the config register. A special fault counter is used in order to avoid erratic behavior near the threshold range. The number of faults (conditions when the temperature exceeds threshold values) is determined by two bits in the configuration register. The OS pin will be asserted only when the programmed number of faults is reached, effectively acting as a filter, preventing false triggering situations. OS pin is routed to the mikroBUS™ INT pin, labeled as OS.

The power consumption is an important characteristic when building embedded applications. Therefore, this sensor allows ONE SHOT mode to be used, reducing the overall power consumption. This allows the device to operate while staying in the SHUTDOWN mode. Writing logic 1 to an appropriate bit of the configuration register will wake up the device from the SHUTDOWN mode, perform one temperature conversion, and revert the sensor back to SHUTDOWN mode. This mode is very useful if the application allows less measurement samples to be taken per time interval.

As mentioned above, the I2C bus has the timeout feature. A logic 0 will enable the timeout feature, preventing the SDA pin to stay at LOW logic level for more than 50 ms. In addition, the I2C bus has the lowpass filters applied to its pins, preventing excessive EMI to affect the communication. Combined with the careful layout of the PCB, this helps reducing the digital noise sensitivity of the Click board™. This makes for a robust I2C interface, immune to interferences which is able to work even in reasonably noisy environments.

Specifications

Type Temperature
Applications A perfect solution for development of health-related applications. It can be used either for monitoring of the body temperature, or it can be simply set to alert about "fever – no fever" states.
On-board modules MAX30205, an integrated human body temperature sensor, from Maxim Integrated
Key Features Specially designed PCB, accurate thermal sensor, compliant with the ASTM E1112 standard, dual mode interrupt output with programmable polarity, improved accuracy in the range of 37.5 ℃ to 40.0 ℃, low power consumption, and more.
Interface I2C
Input Voltage 3.3V
Compatibility mikroBUS
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on Fever click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes Pin Mikrobus logo.png Pin Notes
NC 1 AN PWM 16 NC
NC 2 RST INT 15 OS Interrupt/Comparator
NC 3 CS TX 14 NC
NC 4 SCK RX 13 NC
NC 5 MISO SCL 12 SCL I2C
NC 6 MOSI SDA 11 SDA I2C
Power supply +3.3V 7 3.3V 5V 10 NC
Ground GND 8 GND GND 9 GND Ground

Fever click specification

Description Min Typ Max Unit
Conversion time 44 50 ms
Thermal accuracy (depends on the temperature range) 5 mA
Resolution 0.00390625 °C/LSB

OnBoard Jumpers and Settings

Label Name Default Description
LD1 PWR - Power LED indicator

Software support

We provide a demo application for Air quality 5 click on our Libstock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Library Description

Key functions :

void fever_writeReg(uint8_t regAdd, uint8_t regVal); - Generic function for writing to registers.

uint16_t fever_readReg(uint8_t regAdd); - Generic function for reading from registers.

float fever_getTemperature(); - Returns temperature value in Celsius.

Example description

  • System Initialization - I2C module initialization
  • Application Initialization - Click driver initialization
  • Application Task - Reading and displaying current temperature via UART
void applicationTask()
{
temperature = fever_getTemperature();
FloatToStr(temperature, text);
mikrobus_logWrite("Current Temperature :",_LOG_TEXT);
mikrobus_logWrite(text, _LOG_TEXT);
mikrobus_logWrite(" C", _LOG_LINE);
Delay_ms(1000);
}

The full application code, and ready to use projects can be found on our LibStock page.

Other mikroE Libraries used in the example:

Conversions

  • UART
  • I2C

Additioanl notes and information

Depending on the development board you are using, you may need USB UART clickUSB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

mikroSDK

This click board is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant click board demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.