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cc2431 programmer
Check your groud and cable length. Also take care that the power on cc2430 is properly decoupled.
Please note that the circuit above does not work connected to usb hubs.
latching relay transistor
What type of a relay do you use?
Can you measure the voltages on the transistors with all 4 combinations and post it back.
400mA should be more than enough. Most relays are 200-400mW. That is max 80mA @ 5V
usb port interfacing
1.) New languages like Python,C#,Java ( in that order ) are easier to learn than C/C++. They all can access Serial Ports
Python - pyserial
Java - rxtx http://users.frii.com/jarvi/rxtx/
C# - build in
2.) Direct access to USB from user-space(not driver) program is...
Re: USB ustream power
This means that the supply current should not be flowing from device to host(computer).
This is only applicable for self powered devices.
Re: Hardware Design !!
1) cost, availability( will this component be available durring the lifetime of the product), reliability( ex. for caps )
2) if signal wavelenght is less than 10*trace length.
cc2430 debug
We have a ICE cc2430 programmer available( with some basic debugging support ).
The hw design and software is open source but we also sell them **broken link removed**
Cheers.
Peter Kuhar
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