One nOOd

If you're using just one nOOd, the wiring is very simple. The + side goes to SW (switch) and the - end goes to Gnd. 

Multiple nOOds with Software Control

This wiring diagram shows how to connect 3 nOOds to a QT Py Stemma, and includes some bells and whistles: a JST connector with on/off switch, and current-limiting 220 ohm resistors.

This is a more complicated project, but it gives you a lot of control, as well as access to a much juicier battery source than a single coin cell can provide.

nOOds Hookup

• QT Py Stemma GND --> nOOds G (all 3 connected to the same pin)
• QT Py Stemma SCL --> nOOds +
• QT Py Stemma SDA --> nOOds -
• QT Py A3 --> nOOds +

You can keep adding nOOds to the remaining GPIO pins on the QT Py for larger projects, or if you want even more nOOds, you can add on an Adafruit AW9523 GPIO Expander and LED Driver Breakout. Check out the  nOOds Uberguide for more info.

JST Power Switch

• QT Py G --> JST Breakout G
• QT Py 5v --> JST Breakout Sw