By Marco Ventimiglia on July 26, 2022
As we all know, Arduino Uno features a 10-bit ADC (analog-to-digital converter) inside its ATmega328p, which takes a sign between 0 and 5V and produces a digital worth that varies from 0 to 1023. Nevertheless, making an attempt to measure any voltage above 5V will trigger some lower than fascinating outcomes, comparable to creating magic smoke and destroying the microcontroller. To get round this, some makers add a voltage divider that divides the enter voltage by a predetermined issue. This answer reduces the decision of the ADC, as a single step of the digital worth corresponds to a better voltage variation. To unravel this drawback, the YouTuber often called Techoyaki has provide you with a brand new answer that may measure the complete vary of values with out lowering the decision.
The circuit divides the 0V-20V vary into 4 ranges (0V-5V, 5v-10V, 10V-15V and 15V-20V) translating all of them into the 0-5V vary. After that, these 4 obtained indicators arrive on the Arduino’s 4 analog inputs, which add up the values to provide the equal of an ADC of almost 12 bits, thus resulting in values that fall between 0 and 4092 (1023 x 4).
The circuit consists of 4 rail-to-rail operational amplifiers, and varied resistors, which permit to restrict the voltage obtained within the 0v-5v vary and subtract a DC voltage worth to impact the interpretation within the desired vary.
About Marco Ventimiglia
