Figure 1: Block diagram of a the sensor and calibration system Sense elements typically have non-idealities, such as offset, nonlinearities, and gain errors. Mathematical algorithms implemented in the ...

Even the STM32 built-in temperature sensor has really poor accuracy, like +- 5°C. Adding NTC resistor to ADC pin costs 2 cents and gets you to +-1°C or better.

In an afternoon I built a smart sensor that reads and displays soil-moisture levels, light intensity, and temperature. What You'll Need • Bolts, nuts, ring terminals ($5) ...