The capacitor trick has an issue

[pulsar123]

First of all, thanks for this project!

I have an issue with the capacitor trick - my ASCOM driver couldn't connect to the focuser until I soldered 10 uF capacitor between RST and GND of Arduino Nano. Now it connects all right, but I have another issue - I can no longer reprogram Arduino. (Arduino IDE fails to connect.) Is it a known issue? May be changing the value of the add-on capacitor can help? Or the only solution is to solder/desolder the capacitor every time I need to reprogram the board?

I also have a question about the meaning of the speed parameters: speedFactor and speedFactorRaw. In your code the values for these two are 16 and 4. Do I need to keep these values, and only change SPEED_MULTIPLICATOR to achieve the speed I need? In my case, I am using 1/32 microsteps, and my target speed and acceleration are 3765 ustep/s and 941 ustep/s^2, respectively.

Finally, I do not use IN/OUT buttons or a pot. I just set

int btn_in = HIGH;
int btn_out = HIGH;

throughout the code - this should do the trick, correct?

[PoppyClick]

You can program by hitting the reset button at the right time but it's tricky. (Turn on compilation traces and press just before televersing)

[fehlfarbe]

Hey @pulsar123, sorry for my late replay!

As @MonsieurFantome suggested, you can try to press the button at the right time or maybe solder a switch/button in between like RST -> 10µF cap -> switch -> GND so you can use the switch to select "programming mode" or "ASCOM mode".

I think changing the SPEED_MULTIPLICATOR to a higher value should do the job because the speedFactor, which is set via ASCOM, is multiplied with this value.

You can set the buttons manually to HIGH but this shouldn't be necessary because Arduino's internal pullups are already set to HIGH:

// setup buttons
pinMode(BTN_IN, INPUT_PULLUP);
pinMode(BTN_OUT, INPUT_PULLUP);
pinMode(BTN_POTI_SPEED, INPUT_PULLUP);

[pulsar123]

Thanks for all replies, I ended up soldering a tiny switch.