Questions tagged [op-amp]

Question 1

So PWM goes from 0 to 5V. How could I do -2.5 - 2.5V? Basically I am asking how to add offset to PWM signal. Should I use operational amplifier? How would I use it? I never had to deal with them, but ...

Question 2

I would like to understand why did Arduino clipped the input signal as shown in the attached diagram? As far as I know, Arduinos are able to read analogue voltages up to 5v, that is 1023. But for some ...

Question 3

I am designing a circuit to measure the temperature via a thermistor via the ADC pin on a 328p and I am looking for some advice. As a failover I am also using an OP Amp as a comparator, to see whether ...

Question 4

I am trying to detect whether a signal is high or low from an ESU LokSound 5 decoder for HO locomotives. My idea was to use one of the auxiliary pins used to drive an LED (AUX 3 in my case). The ...

Question 5

Is there any option how to control amplification ratio of operational amplifier by some logic signal which can be produced by arduino? I am talking about some clasic op amp like lm356 or ui741 in ...

Question 6

Is there any circuit with opamp where can be (by arduino) set constant output amplitude which doesn't depend on input signals amplitude?

Question 7

I have this little AtTiny45 which I'm loading a program with Arduino as ISP. My goal to use this chip along with a op amp, a piezo buzzer and a press button, and have it automatically sleep between ...

Question 8

I am trying to read the values from a simple EMG circuit (with an INA122P) using the analogRead() and plotting in the plotter using an Arduino nano v3. I am powering the ina1222p from the 5v pin of ...

Question 9

I am working on a project which involves counting the drops falling in a drip chamber of a IV fluid gravity based therapy bottle(saline bottle).I am using IR trans-receiver at the drip chamber to ...

Question 10

I’m creating essentially a load cell using an Arduino Nano and an HX711 amplifier. However, I want to have two HX711 amplifiers running off the same Arduino. Will that change the supply voltage since ...

Question 11

simulate this circuit – Schematic created using CircuitLab Wiring is based on the scheme presented below - (Reference: https://electronics.stackexchange.com/a/174580) I am using Arduino Mega ...

Question 12

Getting an audio signal from a 3.5mm jack amplified (non-inverted) and fed into analog in pin on a Mega 2560. I am having problems using a potentiometer as a variable resistor to adjust gain. I'm also ...

Question 13

I created the circuit in this schematic on protoboard, and the code, https://github.com/elkayem/midi2cv I use a dual opamp and a single dac, because i only need note and velocity. The opto i use is, ...

Question 14

I am using a JIC 139 UV Sensor (datasheet) with an Arduino Mega 2560 and should be reading smooth curves as I bring a UV source to towards the sensor. Instead, my curves are increasing and oscillating....

Question 15

I am trying to amplify a piezo sensor per the instructions found at the link below. I am not trying to trigger a buzzer only print to the serial monitor whether the vibration was detected or not. I ...

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Questions tagged [op-amp]

How to offset PWM output so it would also have negative amplitude?

Signal clipping in Arduino Serial Plotter

Mesure sensor voltage by 328p and OP Amp in parallel

Reading ground signal from circuit

Controlling op amps amplification ratio by arduino

Stable amplitude of amplified signal

Arduino IDE on Attiny45: What kind of power does a chip need?

Noise in Analog Read Serial from an instrumentation amplifier(ina122p)

I am facing a problem of firing multiple interrupts on nodemcu 1.0 on single rising edge pulse.what is problem and what are the solutions?

Does using multiple HX711 amplifiers change the supply voltage of an Arduino?

HX711 - Inconsistent Readings

op amp circuit single sourced from arduino power

Arduino Nano Midi to cv convertor interesting issue

Oscillating Analog Readings

Amplify Piezo Sensor

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