The Fiorotti Timer uses an Accelerometer to adjust power as needed. Functions include, in non-engineer terms and hopefully correct
1) Start delay in seconds
2) Time in minutes to be used with 3
3) Time in seconds
4) Sensitivity for "424" which is rpm gain or possible reduction based on "tilt" or angle of the sensor
5) Increased or decreased rpm sensitivity based on centripetal acceleration
6) Limit of rpm increase of 5
7) Limit of rpm decrease of 5
and base RPM adjustment.
Defaults are preset as a starting point.
In addition, sensor placement is a variable.
And finally, an ESC is required, Castle suggested, and some programming is needed and values are provided as starting points.
As MM found, the timer and sensor can be used essentially as sent. I tried a different approach as the rpm default in particular concerned me. A tachometer reading showed around 9600 rpm if I recall correctly, but that is not an exact set, but battery cell number/voltage, motor and Kv, and perhaps prop dependent. Before heading to the field, the rpm was adjusted as per the website video to about 10,300 - 10,400 rpm, the previously used value. That also provided a basic understanding of the programming sequence.
It is somewhat difficult to describe and understand the programming without having any demonstration, but the rpm video may be helpful. The rpm video shows the rapid sequence flashing that is encountered in setting rpm, and in entering function programming. Best observed to be understood, so if you are trying to understand, look at the video for rpm. Flying with all default settings is fine, but, the time for default was 3 minutes and 20 seconds. Specifically short to allow the user to figure lap times or rpm, and battery usage over 3 minutes and 20 seconds and then calculate what 5 minutes and your choice of seconds will bring. No use in killing a battery from too fast rpm for too long. I found that the best way to learn the function setting was to repeatedly set minutes until comfortable. Minutes because that was the only change along with rpm to get a basically good full pattern flight.
Setting rpm requires holding the start button in until you have observed two sequences of rapidly flashing lights. There is a several second delay between the two sequences, so expect that. That can be observed on the video. To enter the function section, hold the button through the first sequence and then release and then wait a few seconds. The timer will then self interrogate and show defaults. Function number is the number of long flashes and the actual setting is the number of short flashes following and the timer will continue self interrogation through the seven functions. My concern was function 3, minutes and the 3 long flashes was followed by 3 short or more rapid flashes. Once the timer cycled through a time or two, I begin to understand the sequence. It is then a matter of holding the button in at the start of the function/flashes that you wish to change. The long flashes and short will go as usual, button still in, and then release the button. After giving you the current setting, the short flash sequence then repeats and you press the button at the desired number of flashes. Let the timer continue briefly, then you can unplug to store the setting. I then re-interrogate to make sure that I have what I want. While very wordy and tedious to describe, it is easily done after first couple of times quickly and without difficulty at the field.
Hopefully this will help in addition to instructions on the site, written in Portuguese and then translated, Google or similar.