What causes this error: Error: Input power pin not driven

[Steve_W]

I have just drawn my first schematic, I get the error shown in the picture attached, also attached is a picture of the offending circuit. I am using:

Application: KiCad Schematic Editor (64-bit)

Version: (6.0.10), release build

Libraries:
wxWidgets 3.2.1
libcurl/7.86.0-DEV Schannel zlib/1.2.13

Platform: Windows 10 (build 19044), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
Date: Dec 19 2022 21:23:04
wxWidgets: 3.2.1 (wchar_t,wx containers)
Boost: 1.80.0
OCC: 7.6.2
Curl: 7.86.0-DEV
ngspice: 38
Compiler: Visual C++ 1929 without C++ ABI

Build settings:
KICAD_USE_OCC=ON
KICAD_SPICE=ON

any ideas where the error codes are explained?

Thanks Steve W

[retiredfeline]

I’ll leave jmk and others to answer your FAQ but I just want to say it’s an opportune time to start with 7.0 since it’s just been released and discussions will centre on that going forwards.

[jmk]

Hello and welcome @Steve_W ,

You have labels attached to wires (+9V and GND). You need power symbols.

You will find power symbols in the Kicad libraries in the “power” library.

@retiredfeline

it’s an opportune time to start with 7.0

Yes, very opportune. I, for one, have already forgotten too much of 6.

[Steve_W]

Thank you I suspected as much,

regards
Steve W

[retiredfeline]

Actually you will still get the ERC warnings even after using power symbols. Either ignore them, attach a 9V battery, or attach PWR_FLAGs. That last term is the FAQ search term you should use.

[Jonathan_Haas]

KiCad is just warning you that it doesn’t know where the power for +9V and GND comes from. Once you’re sure that you’re actually supplying power to the components using a battery, DC connector or whatever, you can eliminate the warning by placing a PWR_FLAG symbol on the nets, which acts as a power input for KiCad.