Microcontrollers, Analog, RF, and all three mixed. Most projects can be assembled from readily available parts without the need for specialized equipment.
Voltage Recorder With Playback The recorder includes the functionality of a data logger but also plays back recorded voltages and can perform a curve trace function.
A simple file system provides for up to 128 different sequential files totaling up to 130,000 samples. At 1 sample per minute, that's 90 days of continuous recording.