A 9-bit ADC referenced to 10V full-scale has a least significant bit of 19.5 mV. The hysteresis voltage is 22.6 mV, and this dead zone equates to more than a least significant bit for a 9-bit ADC, so ...

he set himself some tall design goals. Using the ATtiny85 and a few SMD discretes, he built a handy tester that met all of his requirements and then some. The ATtiny85’s Analog Comparator ...