A voltage to frequency converter can realize an opto-isolated analog input for Arduino or other microcontroller systems.
Project tutorial by Giovanni Carrera
A simple and inexpensive solution is to use a 'mobile power bank'
by Giovanni Carrera
With this simple circuit the analog output of Arduino Due start from zero
This interesting project will cover all things required for the ultimate goal of building a mobile remote surveillance camera.
Project tutorial by danionescu
The robot navigates indoor, in a pre-defined path, with high accuracy, and allows its real-time tracking on a phone. No GPS, No WiFi, No Map
Project tutorial by Team oblu
A tiny telegraph that can write any text messages that look like a telegrammes. This project made of oak plywood.
Project showcase by Yegor_A
I designed this system to replace an analog PID, also designed by me. But then I never made the digital PID with Arduino Due, because the analog PID works very well and maybe it's more reliable.
Before the analog PID I had done a PID with Labview on PC, but I could not use sampling periods of less than 3 milliseconds, because of Windows that does not allow real time.
What I can tell you, on a theoretical basis, is that the sampling rate must be higher than the the bandwidth of the system to be controlled. I think there are no problems working with Arduino Due at 5-10 kHz, but I've never tried to do it.
I apologize because I had not noticed this inconvenience and you are the first to notice this. Now I set the figure, on my blog, in the original size and you can read it well. Happy New Year wishes to you too
Instead of a preamplifier with discrete components, you can use an instrumentation amplifier, more expensive, but simple to use. For example an INA125, AMP04, AD8221 etc.
As for the offset, I've already given you an answer. With a single supply, an operational amplifier has saturation problems close to zero, so you must use a negative power supply or specific op amps.
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