a bit more info about the saving and loading of the LUT

Author: askuric

src/encoders/calibrated/README.md

@@ -81,11 +81,44 @@ void setup() {
 
 Please see the more complete [example](https://github.com/simplefoc/Arduino-FOC-drivers/blob/master/examples/encoders/calibrated/sensor_calibration.ino) in our examples directory.
 
+## EDIT March 2025
 
-## Roadmap
+The code has been rewritten to reduce its memory footprint and allow more flexible Lookup table (LUT) sizing. 
+Additionally, the calibrated sensor class now supports providing the saved LUT as a parameter to the constructor. This allows you to save the LUT and load it on startup to avoid recalibration on each startup.
 
-Possible future improvements we've thought about:
+The LUT and sensor's zero angle and direction are outputed by the calibration process to the Serial terminal. So you can copy and paste them into your code.
 
-- Improve memory usage and performance
-- Make calibration able to be saved/restored
+Your code will look something like this:
 
+```c++
+
+// number of LUT entries
+const N_LUT = 100;
+// Lookup table that has been ouptut from the calibration process
+float calibrationLut[N_LUT] = {...};
+
+// provide the sensor class and the number of points in the LUT
+CalibratedSensor sensor_calibrated = CalibratedSensor(sensor, N_LUT, calibrationLut);
+
+... 
+
+void setup() {
+  ...
+  // as LUT is provided this function does not need to be called
+  sensor_calibrated.calibrate(motor); 
+  ...
+
+  motor.linkSensor(&sensor_calibrated);
+
+  
+  // write the sensor direction and zero electrical angle outputed by the calibration  
+  motor.sensor_direction = Direction::CW; // replace with the value outputed by the calibration
+  motor.zero_electric_angle = 0.0;        // replace with the value outputed by the calibration
+
+  ... 
+  motor.initFOC();
+  ....
+}
+
+
+```