Category: Teardown

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Inside the Thermotalk Plus

The thermotalk plus by Miniland Baby is a clinical IR thermometer with pulse reading. The main features are:

  • Ultra-quick thermometer with infrared temperature measurement in 1 second.
  • Measures body pulse in just 15 seconds.
  • Communicates measurements by voice through its LCD display.

The thermotalk opens from the bottom just removing four screws. Inside, a single board contains all the electronics. In the top-down view, you can see some interesting components.

First off, an infrared temperature sensor. This type of sensor will transform the infrared light into an electric current. This electric current is then measured by an amperage or voltage detector.

Secondly, a segmented LCD display that is used to show the temperature and various other information. The display is connected to the circuit board directly, without connectors.

Finally, there is the speaker usedto communicate measurements in different languages.

The circuit board looks a two-layer board with green solder mask and white silkscreen on both sides. The PCB is comprised of surface-mount components and some through hole electrolytic capacitors.

The brains of the thermometer is a microprocessor that is die-mounted to the circuit board. A dome of black epoxy is used to keep it in place. It is most likely a custom IC designed especially for this application.

Attached to this microcontroller is a 24C08 EEPROM that most likely saves calibration constants and settings. The EEPROM is in a SOIC-8 package.

And on one tip of the board, there is a Biometric Pulse Rate or Heart Rate detecting sensor.

After disassembling, there are some components to reuse:

  • Segmented LCD display
  • IR temperature sensor
  • Speaker
  • EEPROM
  • Heart rate sensor
  • Mechanical button

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