Circuit Diagram

Take a moment to review the components in the circuit diagram. This illustration is meant for referencing wired connections - The length of wire, position and size of components are not exact. 

The 500mAh lithium polymer battery is connected to the microUSB lipo charger via JST cable. The Bluefruit EZ-Key has VIN pin connected to a slide switch. The BAT pin on the micro lipo charger is wired to the slide switch. The ground pin on the Bluefruit EZ-Key is wired to the GND pin on the micro lipo charger. 

A 6mm tactile switch is wired to pins 3V and PB on the Bluefruit EZ-Key to serve as a bluetooth pair button.

The 6mm and 12mm tactile button inputs are wired to input pins 0-7 on the Bluefruit EZ-Key. Each tactile button has ground connected to ground rails on the Perma-Proto PCB.

The 1/2 sized Perma-proto breadboard PCB will house the 8 momentary push buttons. The right-side of each buttons will act as the ground connection. Each of the buttons right terminal are wired to the ground rail. The two ground rails are wired together. A single wire for the ground connection is wired to the Bluefruit EZ-Key. Each botton left terminal has a wired connection to the input pins.

The input connections on the Perma-Proto should preferably be made on the back of the PCB and close-to to terminal, not actually on the same through-hole. 

Be very aware and cautious when wiring these connections. It's easy to get lost and loose your place/spot while soldering. Always double check your connections before you solder!

This guide was first published on Feb 15, 2015. It was last updated on Feb 15, 2015. This page (Circuit Diagram) was last updated on Oct 17, 2019.