Hi Robert, it's been a long time now that this version of your project is out and I guess most of the activity is now on Focuser PRO 2. Anyway, I think my question is applicable to both version of you Focuser project. Reworking to build a new focuser for a new setup, there is a point I would like to clarify about the Reset capacitor. According to your schema, you use a polarized capacitor of 470µF capacitor to connect RST with +5V . Locking around to get some information about this I found that recommendation on how to disabling the autoreset of the Nano using a capacitor, but connected from RST to GND and only 47µF. I also tested this solution on my breadboard and found that is was working as expected for my Nano. Would it be possible to clarify this part of the desing ?
Regards
Franck
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Hi Franck
There are lots of different opinions on this and also a lot of variations between nano boards v2, v3, v4 and whether they have the ch340g or fdi chips on board. You will find some have a pullup 1K, others 10K, some have a 10nF to gnd, some also have DTR tied to it.
There are also other recommendations using resistors to gnd, or to remove the solder on the RST_EN pads on the underside as well.
I really don't care what method is used as long as it prevents the reset of the arduino when the usb lead is connected/disconnected, or when an application accesses/opens the associated com port.
Regards
Robert
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi Robert, it's been a long time now that this version of your project is out and I guess most of the activity is now on Focuser PRO 2. Anyway, I think my question is applicable to both version of you Focuser project. Reworking to build a new focuser for a new setup, there is a point I would like to clarify about the Reset capacitor. According to your schema, you use a polarized capacitor of 470µF capacitor to connect RST with +5V . Locking around to get some information about this I found that recommendation on how to disabling the autoreset of the Nano using a capacitor, but connected from RST to GND and only 47µF. I also tested this solution on my breadboard and found that is was working as expected for my Nano. Would it be possible to clarify this part of the desing ?
Regards
Franck
Hi Franck
There are lots of different opinions on this and also a lot of variations between nano boards v2, v3, v4 and whether they have the ch340g or fdi chips on board. You will find some have a pullup 1K, others 10K, some have a 10nF to gnd, some also have DTR tied to it.
There are also other recommendations using resistors to gnd, or to remove the solder on the RST_EN pads on the underside as well.
I really don't care what method is used as long as it prevents the reset of the arduino when the usb lead is connected/disconnected, or when an application accesses/opens the associated com port.
Regards
Robert