User Manual/2. Setting up the system
Congratulations! If you got here it’s because you have already gathered together all the parts needed to build your motion capture suit. Now is the moment of truth.
Initializing and testing the system
In this chapter we will put everything in place and see if it's working correctly. We should check the following functionalities:
- The SBC boots correctly.
The SBC acts as an access point, and we are able to connect to it from a separate PC. The Utility software on the SBC is working correctly.
- The Hub and K-Ceptors are wired correctly and the Notochord is able to talk to them.
Powering the system
To power the system a 5V, 2A supply is needed. It can be connected to the SCB only, or also to the Hub. Both connections use a micro USB-B connector. By far the easiest way to achieve it is to use a common power bank. It should be rated for at least 2A.To have a durable supply a capacity of at least 10000mAh is desirable. Under normal capture conditions such a power bank was able to keep the system running for around 8 hours.
The Chordata Hub has two possible configurations: with or without a separate power source. A jumper on the Hub (JP1) allows you to select between these configurations.
- In the former the power comes from a buck converter on the Hub, that takes a 5V input and delivers 3.3V to the rest of the system.
- In the latter the power comes from 3v3 rail on the SBC.
A 5 volt tension can be applied only via the micro USB connectors on the Hub or SBC
Using the dedicated power source
This is the recommended configuration. The power line from the Powerbank should go to the micro USB connector on the Hub (J12), and from the big USB connector (J11) to the SBC.
To use this configuration the jumper should be positioned connecting the pins #1 and #2 of JP1
Using the 3v3 rail from the SBC
This configuration is mostly used for testing purpouses. The power line from the Powerbank should only go to the micro USB connector on the SBC.
To use this configuration the jumper should be positioned connecting the pins #2 and #3 of JP1
- File:SBC power source selection.jpeg
Selecting the SBC power source with a jumper
Wiring the Hub and raspberry
Start by wiring the hub and the raspberry using female jumper wires as described in the diagram. Then power the Raspberry. You should see a red led constantly on and a green led blinking, that means that the amount of power provided is enough to keep the Raspberry working, and also that the system is booting.
The blue led on the Hub should stay on as an indicator of a stable power supply.
Checking the Hub color code to get the state of the system
When the power is plugged to the SBC you should see the blue led [R1] on the Hub turn on and stay that way. This means that power is also arriving to the Hub. After some time you should see the RBG led [U4] on the hub start to change state:
|0||ORANGE||the system has boot, but the WIFI interface is still not ready|
|1||GREEN||the SSID has been exposed, and the system is waiting for a node to connect, or that someone has already connected to the WIFI network, but hasn’t accessed the server.|
|2||BLUE||the system has found an external WIFI access point with the correct name, and it has connected to it|
|3||RED||there was an error|
|4||YELLOW||at least 1 client is connected to the notochord server|
|5||WHITE||the notochord is transmitting data|
If after some time the led turns green or blue, then we are good to go.
Accessing the remote console
The remote console is a web-interface program that allows you to control the state of the notochord from any computer or mobile device, without installing additional software.
Your device should be connected to the same network than the notochord, most of the time this means accessing the WIFI network that the notochord has exposed with the name
Chordata-net. Then from a web browser go to the address:
notochord.localname is resolved because the notochord acts as a DNS server on the local network. If your browser just keeps waiting for a response, and eventually times out, it probably means that you device is using another DNS server. You can try checking if your browser has an static DNS on its configuration, otherwise perhaps an static DNS server was set system wide. If your are connected to another network apart from the
Chordata-netyour device might be using the other network's DNS. Try disconnecting from other networks apart from the notochord one.
You should see a page like the one in the picture, this is the remote console:
Click in the big
You should see a welcome message on the console, and the RGB led on the Hub should turn YELLOW.
helpto get a list of the remote commands available. The most important command is
initwhich accepts arguments. Every argument passed as initialization argument to a call to
notochord. For example, you can type
init -hto get a list of all the possible notochord arguments
Connecting the K-Ceptors
Plug one of the ID Modules on top of one of the K-Ceptors, then plug it to one of the gates of the Hub.
Be sure to plug the cable on the
IN --> connector of the K-Ceptor.
Other K-Ceptors can be connected to the output of the previous one forming a chain, always going from
OUT --> to
On a working K-Ceptor the Blue led [D1] should turn on and stay that way.
If you built the hardware yourself and want to know how to test and troubleshoot a K-Ceptor take a look at: Troubleshooting a K-Ceptor