PCB scheme for developing and designing an infrared human body thermometer

PCB scheme for developing and designing an infrared human body thermometer

The PCB scheme for the infrared human body thermometer developed and designed currently uses an 8-bit CMOS infrared forehead temperature gun single chip MCU - ZHW3548, which has accurate temperature measurement and good quality. And it adopts LQFP48 packaging, with a 24 bit ADC with 1 fully differential analog signal input, which is equipped with a built-in charge pump, built-in voltage regulator for sensors and modulators, in order to better cooperate with the temperature measurement of the thermopile sensor. Ultimately, the following functions can be achieved:

(1) Product composition: Composed of a thermopile type infrared sensor, a microprocessor memory, a liquid crystal display circuit board, and an outer shell; Button control: Multiple button control, on/off, temperature measurement, mode switching;

(2) LCD display: Backlit LCD display, reading is still clear in dark environments, and with three colors (red, yellow, green) of backlight;

(3) Button control: Multiple button control, on/off, temperature measurement, mode switching; Unit conversion: Intelligent conversion of Celsius and Fahrenheit units;

(4) One click temperature measurement: infrared measurement, one click temperature measurement, simple, fast, and high accuracy;