Tagged Questions

124 views

Simple measurment of resistance with microcontroller

What is a simple way to measure resistance (in this case 0-100 kOhm) using micro-controller (I'm using STM32, it has 12-bit ADC, timer, but no comparator). I want it simple (not too many components) ...
67 views

Reading Voltage NTC Sensor, Unexpected Behaviour

Below pictured is the basic circuit im working with, NCT is apparently pretty much a variable pot resistor. The measuring point ive added. According to the manual for my car, the sensor is provided ...
77 views

Potentiometer voltage change

I'm trying to understand simple things about electricity reading allaboutcircuits.com web. This chapter includes image which´s principle I don't understand. Here it is: When supplying constant ...
168 views

Measuring very small changes in resistor network using current source

I am trying measure a very small change in resistance (approximately .400 Ohms), due to the the effects of connecting a large resistance in parallel with a network of smaller resistors essentially ...
169 views

Selectable Voltage Divider Optimal Switching Point

I've built a circuit to measure an unknown resistance (over a large range) which is basically the following: simulate this circuit – Schematic created using CircuitLab Range_Select_1 and ...
601 views

Resistance to Digital converter

I am trying to make a digital ohmmeter on a parallel port interface that can measure resistance with at least 95% accuracy. I have tried a 555 timer monostable assembly which generates a pulse with ...
126 views

Is there an out-of-the-box solution for measuring low resistances?

I have a microprocessor project where I need to measure resistances between .1ohm and anywhere above 10ohm and I need to do it about 1000 times per second. Guessing from the number of tutorials I've ...
1k views

How do electrical body fat detector work?

I would like to build me own electrical body fact calculator from a microcontroller (the Arduino), but I would like to know how does it work. I have a 5V analog reader, So I guess I sould calculate ...