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GY-63_MS5611/libraries/AS5600/notes_on_PWM.md
Rob Tillaart 3360ecdaaf add notes on PWM
2024-06-02 12:40:40 +02:00

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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