Gyro / Zigbee module status?
Gyro / Zigbee module status?
by dmichaelson
Wed Dec 20, 2006 7:21 pm
Sorry for two consecutive posts, I have many questions 
Just curious if anyone knows the status of either the gyro or zigbee modules?
It seems like Robotis has mentioned them from time to time, but do they exist or has anyone heard when they will?
Just curious if anyone knows the status of either the gyro or zigbee modules?
It seems like Robotis has mentioned them from time to time, but do they exist or has anyone heard when they will?
by dmichaelson
Wed Dec 20, 2006 8:52 pm
limor wrote:We received a sample of the upcoming ZigBee boards and PC addapter.
Haven't had time to test it with Christmas shopping craze we experienced.
Cool! Look forward to getting my hands on one of these after Christmas
Looks like the PC adapter is serial not USB?inaki wrote:An obvious reason to go with Bluetooth instead of Zigbee is that you don't need any aditional interface on your PC/PDA/Phone.
True, that makes sense for a laptop or PDA or phone. Putting your robot's logic on a phone would be pretty rad. Do phones have a serial bluetooth stack?
by Bullit
Sun Jan 14, 2007 1:44 pm
Phones with Bluetooth and CLDC 1.1 have SPP serial port stack. I use a phone with some custom java code to control my bots.
From what I understand the advantages of Zigbee over Bluetooth is that it is more realtime then Bluetooth and when signal is lost Zigbee connects faster. Although Bluetooth 2 can operate up to 3 Mb/sec if you were to loopback one character it would take about 80ms. Zigbee operates only up to 115kb baud but loopback time should be less then 1ms. The complex protocol stack of Bluetooth and USB cause the turn around time to be so slow. If you intend on doing realtime control on your PC then this may be important. The USB delay is likely the reason the PC interface for Zigbee is RS-232. So if you really need realtime control don't use a USB to serial converter to get realtime. I personally have found Bluetooth to work excellent but I keep realtime code on the my bots.
From what I understand the advantages of Zigbee over Bluetooth is that it is more realtime then Bluetooth and when signal is lost Zigbee connects faster. Although Bluetooth 2 can operate up to 3 Mb/sec if you were to loopback one character it would take about 80ms. Zigbee operates only up to 115kb baud but loopback time should be less then 1ms. The complex protocol stack of Bluetooth and USB cause the turn around time to be so slow. If you intend on doing realtime control on your PC then this may be important. The USB delay is likely the reason the PC interface for Zigbee is RS-232. So if you really need realtime control don't use a USB to serial converter to get realtime. I personally have found Bluetooth to work excellent but I keep realtime code on the my bots.
by Pev
Mon Jan 15, 2007 1:36 pm
mic wrote:Pev wrote:I certainly have seen posts on here where people have loaded my PDA interfaces to smartPhones and got them working
Pev
Hello pev,
I am very interested in your PDA interfaces, could you post it again? Many Thanks. Mic.
Mic
I've sent you a PM on this
Pev