Relevant for:

Optionally, a PWM function can be activated for each output. With PWM, instead of one bit per channel, a full byte value from 0 …  100 is output, which defines the pulse width at the output in percent. The PWM function is useful for controlling parts of quantities, e.g. regulating a water supply or dimming lights.

▷ Start PiCtory.

▷ Define in the Value Editor under MEM OutputPWMActive, for which of the outputs the PWM should be activated.

Example: If PWM is to be activated for outputs 1 and 2, enter the decimal value 3.

❯ This means that instead of the outputs O_1 and O_2 , the corresponding outputs PWM_1 and PWM_2 can now be used.

▷ Under MEM › OutputPWMFrequency, specify the frequency at which the PWM signal is to be generated. A PWM frequency can be set for each RevPi expansion module:

PWM Frequency Duty cycle[1]

40 Hz

1 %

80 Hz

2 %

160 Hz

4 %

200 Hz

5 %

400 Hz

10 %

▷ Apply PMW_1 … XX for the outputs activated as PWM to enter the desired PWM value in %.

▷ Save the configuration with File › Save as Start-Config.

▷ Restart the driver by selecting Tools › Reset Driver.

Note

Alternatively, you can address the PWM outputs with piTest using the command -w .
1. The current duty cycle in % is set via an unsigned 8 bit value.