Assembly Guide for LYRA
January 1, 2020 | Creoqode Team
The assembly guide will help you build your Lyra DIY and get it working. Even if you have a Lyra RTG, we would highly suggest you to read this guide before proceeding to the next chapter, in order to understand Lyra better.
Let's start by looking at the components that come with the kit.
WHAT'S IN THE BOX
- Creoqode Lyra Circuit Board
- Creoqode Lyra Front and Back Casing Parts
- 5" Display
- Raspberry Pi Compute Module 3+ Lite
- Shoulder Buttons
- Black D Pad and Black X, Y, A, B Buttons
- Clear D Pad and Clear X, Y, A, B Buttons
- Conductive Rubber Pads for Buttons
- LiPo Battery
- 16 GB Micro SD Card
- Micro SD to SD Card Adapter
- Micro USB to USB A Adapter
- Micro USB Charging Cable
- M2 10 mm Screws x 2
- M2 4 mm Screws x 4
- M2 Nuts x 4
- Allen Key
Let’s begin with a look at the circuit board of Creoqode Lyra. Examining the circuit board will help us understand the following chapters better.
FRONT FACE OF LYRA
1. Direction buttons which consist of up, down, left and right. As you would notice, for each button, there are two golden pads integrated into each other with a small gap between them. One of these pads is connected to a signal pin of Raspberry Pi, and the other is connected to ground. When you press a button, the conductive rubber will connect these two pads and the signal pin of that button will be grounded. In other terms, Lyra will know that the button is pressed.
2. Speaker of Lyra. It has 8 ohms of impedance and can handle powers up to 1 watt.
3. Tactile switches that are used as 'Select' and 'Start' buttons.
4. Command buttons which consist of X, Y, A and B. The working principle of these buttons are exactly the same as directions buttons, which is explained above.
BACK FACE OF LYRA
1. Right angled tactile switch that is used as a shoulder button / trigger.
2. DDR2 connector. Raspberry Pi Compute Module 3+ Lite comes in a DDR2 format and is connected to Lyra through this connector.
3. GPIO pins. 8 signal pins of Raspberry Pi CM3+ Lite, VCC and GND pins are exposed for your maker projects.
4. 40 pin FPC (Flat Printed Circuit Cable) connector. Display is connected to Lyra through this connector.
5. Right angled tactile switch that is used as a shoulder button / trigger.
6. Micro SD card socket. Operating system of your choice and all your video games will be read through this socket.
7. On / Off switch of Lyra. DO NOT turn on the device without completing the assembly. It might cause over heating and damage the circuitry.
8. Indication LED's for battery. CHRG is illuminated when the battery is being charged. DONE is illuminated when the battery is fully charged. LOW is illuminated when the battery is about to die.
9. Switch for the speaker. You can turn the sound on / off through this switch. To adjust the volume, you have to use the software.
10. Micro USB port to charge the battery.
11. Audio jack socket for you to connect your headphones.
12. Battery connector.
13. Micro USB port for data transfer. You can connect additional controllers, keyboard, mouse, WiFi dongles etc through this USB port.
14. HDMI port to connect Lyra to a larger display.
First of all, unplug the battery from the circuit board of Lyra. Make sure you complete this step by holding through its white connector as in the images and not through the cables. Take your time and unplug the connector gently.
DO NOT try to switch the device on without completing the assembly. This would cause immediate overheating and can damage the circuitry.
In this step, we are going to mount the battery to the back casing part of Lyra. Inside the casing, you will see two double sided adhesive tapes. Take out the cover of these tapes as shown in the images and place the battery between the plastic indicator walls inside the casing.
Pay attention to the orientation of battery. It should be same as in the photos when you place it inside the casing. Also make sure the battery sticks properly to the casing and is not loose.
Now, start by removing the protective layer from the display.
Then, remove the covers from the doubled sided adhesive tapes that are inside the front casing part of Lyra. Place the display carefully inside the allocated space by making sure the top of the display is in contact with top of the casing. After placing it, tap very gently to the edges of the display for it to stick well to the casing.
Pay attention to the orientation of the display.
Take the buttons and place them to their locations as shown in the images. One set of black buttons and another set of clear buttons are provided with each kit. You can use any of these button sets, or mix and match individual buttons as you wish. Direction button (D-pad) does not have any specific orientation, so you can place it as you wish. For the X, Y, A and B buttons, button guides will help you find the correct location and orientation.
Then, place the conductive rubber pads as shown in the images. The one with a hole in the middle is for the D pad, and the other one is for the X, Y, A and B buttons.
You will need two M2 10 mm screws, four M2 nuts, allen key and two shoulder buttons for this step.
Place the M2 screw through the hole on top corner of Lyra as shown in the images. Tighten the screw strongly with the nut and allen key. Then place the shoulder button as shown and put another nut on top. Tighten this nut to the extend that the shoulder button is nicely secure and does not wiggle, but can be easily pressed and released.
Follow the same steps for the other side as well.
You are now going to connect the display to the Lyra's circuit board. This step requires extra caution as the FPC cable of the display can easily be damaged.
Start by unlocking the connector by gently pulling the black extensions at each corner as in the images. You will hear a small click when each corner is released.
Then, place the circuit board on top of the display such that the FPC cable of the display comes through the hole in the circuit board as in the images. Very gently, connect the FPC cable to the connector by slightly bending it. When it is fully connected, you should not see any of the gold coloured contact pins of the FPC cable.
After making sure the FPC is nicely connected, lock the connector again through the black extensions.
Finally, place the circuit board on top of the casing by making sure the mounting fixtures fit inside the holes at the corners of the circuit board.
Take Raspberry Pi Compute Module 3+ Lite. Connect it very carefully to the DDR2 connector of the circuit board. You should place it with an angle initially as shown in the images. When it is fully connected, push Raspberry Pi gently from its outer edges and it will snap in its place.
Now, connect back the battery to its connector and place the back casing on top of the front. Use the four M2 4 mm screws and allen key to close the casing securely.
YOU'VE MADE IT!
Well done! You have completed the assembly.
Now, use the micro USB cable to charge your Lyra. You can charge it through any USB port including your phone charger and your laptop. When you start charging, you will see an orange LED next to the charging port indicating that Lyra is being charged. When it is fully charged, the orange LED will turn off. Depending on the charger you are using, it can take up to 4 - 5 hours for Lyra to be fully charged.