The goal is to solder the Huzzah and OLED breakout boards so that the OLED screen and Huzzah module are facing in opposite directions. The two buttons on the Huzzah need to be accessible to put the module into bootloader mode and program the Huzzah.
The power and ground will ultimate be connected to the 5V and GND pins on the microUSB breakout board. We'll use a microUSB cable to power the device.
On the OLED breakout, solder the two solder jumper pads SJ1 and SJ2 so that you can use the I2C protocol. Do this before soldering the boards together!
You should get a 6-pin right angle header to solder into the Huzzah FTDI pins. Do this before soldering other things together! Be sure to solder all six headers securely.
Ultimately you will solder the two boards with a header pin lining up V+ on the Huzzah and Vin on the 1.3" OLED. This way all the boards will stack up nicely. Make the other wire connections before soldering the two together however, since it will make the process easier. I've found that thin-gauge, wrapping style wire works best.
Start by soldering a header pin into the Vin on the 1.3" OLED breakout.
If we examine the schematic again, notice that the Huzzah has two GND pins. Since there will be multiple connections to the same GND pin, it can be helpful to solder a male header pin into one of the GND pins. Make sure it's sticking out more on top, so solder it on the bottom of the Huzzah board.
Now make the other connections between the Huzzah and OLED breakout board following the schematic below using thin wire. Remember, ultimately you'll use the header pin soldered into the OLED breakout to make the 5V power connection between the two boards.
From the Huzzah to the OLED breakout, connect:
- pin 2 to Rst
- pin 12 to Clk
- pin 14 to Data
- GND to GND
Now you can solder the Huzzah and OLED breakout boards together. They should be facing away from each other and lined up like this. Place the Vin header pin on the OLED breakout into the V+ on the Huzzah.
Now connect the MicroUSB breakout. Connect the 5V pin to the header pin going through V+ on the Huzzah.
You can also connect the GND pin on the MicroUSB breakout to the header pin sticking out of the Huzzah GND.
Once you've attached the MicroUSB breakout you can cut down the excess header on the V+ pin and GND pin. The circuit is assembled!