- #1
runningman19
- 19
- 3
Hi Everyone,
I would like to measure voltage output from a sensor via an Arduino. The sensor outputs 20 mV at max capacity. I'd like to bump this up to around 5 volts so it is easier to measure. My plan was to use a non-inverting topology coupled with an LM393N op-amp. The schematic for a non-inverting circuit is given below, as per Nilsson and Riedel (1996):
The equation for voltage output is:
vo = 1+Rf/Rs*vg
Where vg is the signal voltage and vo is the signal output. I have a few questions:
I would like to measure voltage output from a sensor via an Arduino. The sensor outputs 20 mV at max capacity. I'd like to bump this up to around 5 volts so it is easier to measure. My plan was to use a non-inverting topology coupled with an LM393N op-amp. The schematic for a non-inverting circuit is given below, as per Nilsson and Riedel (1996):
The equation for voltage output is:
vo = 1+Rf/Rs*vg
Where vg is the signal voltage and vo is the signal output. I have a few questions:
- How should I select resistances for Rf and Rs? Right now, I plan on using a 1kΩ for Rs and a 200kΩ resistor for Rf , which will give me a gain of 201. Is there anything else I should consider when selecting these resistances, practically speaking?
- How should I select a Vcc voltage? Is my only intention in selecting this not to saturate the op-amp?
- Why is non-inverting the best topology for this circuit?
- What is the purpose of Rg in this circuit?