Digital Temperature Sensor Module
A KY-028 digital temperature module uses a thermistor plus comparator so code can read both analog temperature trend and threshold state.
Part images
What it is
A KY-028 digital temperature module uses a thermistor plus comparator so code can read both analog temperature trend and threshold state.
How students use it
Students use it for heat/cool alarms, threshold tuning, analog reading, and comparator experiments.
Pins and power
AO, DO, VCC, and GND on common KY-028 thermistor comparator boards.
Use module power and output levels that are safe for Pico GPIO.
AO provides analog temperature trend; DO changes when the onboard threshold is crossed.
Voltage and safety
Keep outputs at or below Pico-safe voltage.
Do not place the module on hot objects that can melt plastic, damage wiring, or burn skin.
Module internals
Main component: NTC thermistor with comparator module.
Thermistor, comparator, trimmer, LEDs, resistors, PCB, and header.
Datasheet notes
It is not a calibrated thermometer unless students calibrate it carefully.
Common libraries
Use machine.ADC for AO and machine.Pin for DO.
Common mistakes
Expecting exact Celsius values without calibration, touching hot parts, and confusing analog trend with digital threshold.