Sets or retrieves the resolution of
analogWrite() function of a particular pin.
analogWriteResolution() takes one or two arguments:
pin: the number of the pin whose resolution you wish to set or retrieve
resolution: (optional) resolution in bits. The value can range from 2 to 31 bits. If the resolution is not supported, it will not be applied. The default is 8.
analogWriteResolution() returns currently set resolution.
// EXAMPLE USAGE pinMode(D1, OUTPUT); // sets the pin as output analogWriteResolution(D1, 12); // sets analogWrite resolution to 12 bits analogWrite(D1, 3000, 1000); // 3000/4095 = ~73% duty cycle at 1kHz
NOTE: The resolution also affects maximum frequency that can be used with
analogWrite(). The maximum frequency allowed with current resolution can be checked by calling
Gen 2 Devices (E Series, Electron, Photon, and P2; does not include E404X):
On the Photon, P1, Electron, and E Series, pins A3 and A6 (DAC) are DAC (digital-to-analog converter) pins and support only either 8-bit or 12-bit (default) resolutions.