Hello, I'm planning on using an arduino to drive a speedometer, but it seems the speedometer in question takes input directly from a passive ABS speed sensor.
It seems I need a way to generate AC with my arduino controlling voltage between 40mV and ~1.6V. I'm pretty much brand new to electronics so any possible help is greatly appreciated.
Here is something to think about. Analog Devices digital controlled variable gain amplifiers provide discrete levels of gain control over a fixed number of control bits for a variety of audio and optical frequency bands. Then you can possibly use the tone library to generate the frequency. Let us know how this sounds.