Dummy load duration
This parameter will decide how long the dummy load should draw current from the power
source.
What is (pulsing) dummy load? It is a trick to keep power bank alive, when Raspberry Pi is off.
If you are using power bank to power Witty Pi 4 + Raspberry Pi, after turning off Raspberry Pi
and cut the power, Witty Pi 4 only draws about 1mA from the power bank, which is way too
small to keep the power bank alive. If the power bank goes to sleep mode, it will not provide
any power to Witty Pi 4 and hence your Raspberry Pi will not wake up when scheduled
startup is due. Pulsing dummy load is such a trick, that it draws rather big current from the
power bank for a short duration and it does so with a fixed interval. That way the power bank
might be fooled and think the load is heavy enough, and avoid entering the sleep mode.
The default value of dummy load duration is 0, which means disabled (no dummy load at all).
You can set a value between 0 and 255 here. However, we suggest using smallest value
that could keep your power bank alive, usually 10 will do.
Vin adjustment
The voltage is measured by the 10-bit ADC in micro controller. Due to the inaccuracy of
internal voltage standard and error on divider resistors, the result could have up to 5% error.
You can configure this parameter to adjust the result of voltage measurement.
The default value is set to 0.20V, and you can input a value between -1.27 and 1.27 here.
Vout adjustment
You can configure this parameter to adjust the result of output voltage measurement.
The default value is set to 0.20V, and you can input a value between -1.27 and 1.27 here.
Iout adjustment
The output current is calculated by measuring the voltage drop on the 0.05 Ohm sampling
resistor. You can configure this parameter to adjust the result of output current calculation.
The default value is set to 0.00A, and you can input a value between -1.27 and 1.27 here.
7.12 Reset Data…
If you want to erase some data you previously set (scheduled startup time, scheduled shutdown time,
currently used schedule script, low voltage threshold, recovery voltage threshold), you can choose
this option.
Once you select this option, the software will display a sub menu, which allows you to:
Clear auto startup time:
The auto-startup time will be erased and Witty Pi will not auto-start your Raspberry Pi.
Clear auto shutdown time:
The auto-shutdown time will be erased and Witty Pi will not auto-shutdown your Raspberry Pi.
Stop using schedule script:
The “schedule.wpi” file will be deleted.
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