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912 B
912 B
notes on PWM
Description
If you do not know the PWM frequency you can determine the angle with PWM in the following way.
In one period there are 4351 bits (128 + 4095 + 128) These come typically in one pulse like
00001111111111111111111111111111111111100000000
HEADER DATA POSTLOW
Step 1
Determine the duration of one cycle by measuring the time between two RISING edges. Lets call this time FULLSCALE == 4351 bits.
Then the time for one bit BITTIME = round(FULLSCALE / 4351.0);
Step 2
Measure the duration of the HIGHPERIOD == HEADER + DATA
We know the HEADER is 128 bits and FULLSCALE = 4351 bits.
DATAPERIOD = HIGHPERIOD - 128 * BITTIME
ANGLE = 360 * DATAPERIOD / (4095 * BITTIME)
Code: AS5600_pwm_test.ino
Related
https://github.com/RobTillaart/AS5600 https://forum.arduino.cc/t/questions-using-the-as5600-in-pwm-mode/1266957/3