Electronics > KiCad

Trimmer resistors pin not connected?

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Moriambar:
Hi there.
I'm quite a newbie with kicad so I have to ask, although it seems stupid.
I have a trimpot going to gnd as in the image below, to fine tune a simple cc driver


When I'm going to the pcb though, I have this worrysome warning:
[ Specified attachment is not available ]
(which basically says "warning, no connection for symbol R8 Pin 3. And in fact I have no connection for Pin 3, making my trimpot useless, I guess.
I used the standard trimpot symbol, what have I done wrong, and how can I fix it?

Cheers!

langwadt:

--- Quote from: Moriambar on August 20, 2023, 09:30:05 am ---Hi there.
I'm quite a newbie with kicad so I have to ask, although it seems stupid.
I have a trimpot going to gnd as in the image below, to fine tune a simple cc driver
(Attachment Link)

When I'm going to the pcb though, I have this worrysome warning:
(Attachment Link)
(which basically says "warning, no connection for symbol R8 Pin 3. And in fact I have no connection for Pin 3, making my trimpot useless, I guess.
I used the standard trimpot symbol, what have I done wrong, and how can I fix it?

Cheers!

--- End quote ---

it is only a warning and it would still work, the connections are to one end and the wiper

if you want to get rid of the warning and be explicit, use the 3 pin symbol for a trim pot and either connect the third pin or mark it unconnected

Moriambar:

--- Quote from: langwadt on August 20, 2023, 11:02:45 am ---
--- Quote from: Moriambar on August 20, 2023, 09:30:05 am ---Hi there.
I'm quite a newbie with kicad so I have to ask, although it seems stupid.
I have a trimpot going to gnd as in the image below, to fine tune a simple cc driver
(Attachment Link)

When I'm going to the pcb though, I have this worrysome warning:
(Attachment Link)
(which basically says "warning, no connection for symbol R8 Pin 3. And in fact I have no connection for Pin 3, making my trimpot useless, I guess.
I used the standard trimpot symbol, what have I done wrong, and how can I fix it?

Cheers!

--- End quote ---

it is only a warning and it would still work, the connections are to one end and the wiper

if you want to get rid of the warning and be explicit, use the 3 pin symbol for a trim pot and either connect the third pin or mark it unconnected

--- End quote ---
ah ok, thanks, I was worried that the connection would make my resistor fixed.
thanks

Doctorandus_P:

--- Quote from: Moriambar on August 20, 2023, 11:19:28 am ---
--- Quote from: langwadt on August 20, 2023, 11:02:45 am ---it is only a warning and it would still work, the connections are to one end and the wiper

if you want to get rid of the warning and be explicit, use the 3 pin symbol for a trim pot and either connect the third pin or mark it unconnected

--- End quote ---
ah ok, thanks, I was worried that the connection would make my resistor fixed.
thanks

--- End quote ---


I don't know why langwadt thinks it will work.
The resolution of your screenshot is very low, it does not show pin numbers, and the second attachment is apparently attached to something else, but not this forum.

When in doubt in KiCad, just open the schematic editor and the PCB editor at the same time (dual screen or big monitor is really nice here) and then when you select something, the cross probing function will also highlight it in the other program. This is an easy way to verify connections in KiCad.

langwadt:

--- Quote from: Doctorandus_P on August 20, 2023, 05:56:48 pm ---
--- Quote from: Moriambar on August 20, 2023, 11:19:28 am ---
--- Quote from: langwadt on August 20, 2023, 11:02:45 am ---it is only a warning and it would still work, the connections are to one end and the wiper

if you want to get rid of the warning and be explicit, use the 3 pin symbol for a trim pot and either connect the third pin or mark it unconnected

--- End quote ---
ah ok, thanks, I was worried that the connection would make my resistor fixed.
thanks

--- End quote ---
I don't know why langwadt thinks it will work.

--- End quote ---

I looked in kicad and the standard trim pot connects to pin 1 and 2

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