My goal is to make a wireless serial connection to the robot as if it were wired to my laptop. I have 2 xb24 version 1084, usb explorer, explorer regulated. The Robot has rx, tx, gnd and 3.3v pads. As I understand it would be a AT transparent setup.
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1) Phisical connection to Explorer Regulated from robot, DOUT = RX, DIN = TX, GND = GND. Is this correct? 2) What about power? Can I connect the robot 3.3v to the explorer 5v (at the edge of the board) or should I connect directly to the 3.3v on the explorer (looks like direct to the 3.3v xbee pin) instead? 3) USB explorer on x-ctu on my laptop says USB Serial port (com4) so it looks like at least that module is connected. After soldering the explorer regulated to the robot pads, how do I connect to it?
4) I've read about firmware upgrade, is that needed for AT to proceed? 4) What next to make this serial connection happen? Jan 24, 2010 in by New to the Community ( 5 points).
Postfix configuration file plesk tutorial. 3.3v to the explorer 5v works, also to the 3.3v pin1 on xbee. I'm not sure what you mean by this, but I hope it doesn't mean you're actually feeding 5V to the XBee. That would be a sure recipe for disaster.
cannot downgrade to any firmware now to test others, connection to modem lost. There are a few suggestions in the FAQ for dealing with the situation where X-CTU can't talk to the XBee. Version 10CD should be fine though (although it isn't the latest). Reading between the garbled bits in the terminal printout, the far send seems to be reporting quite a few error messages - so something's apparently wrong there.
Also, I'm guessing that the output is being generated at a fairly high rate. Given that, you're probably going to need to implement flow control on the connection in order not to lose characters. However, lack of flow control shouldn't lead to garbled characters. What was the baud rate you were using when you captured the output? Jan 30, 2010 by Veteran of the Digi Community ( 464 points). Hello Johnf, thanks for taking a look here.
The RS Media only puts out 3.3v so what I meant was that I could connect the 3.3v to the 5v input of the explorer regulated with the xbee on it and it would power up normally. I read up on the xbee power input before anything. As fas as the x-ctu, it does read both xbee's at 115200, and I can do At configs, just cant do any firmware updates after updating to 10CD. So i've stayed on 10CD. The robot communicates at 115200 and I have configured both xbee's at that speed and have set 2 stop bits on the hyperterminal with no improvement. So the captured output was using 115200. Freddy Jan 30, 2010 by New to the Community ( 5 points).
Hello Johnf, thanks for taking a look here. The RS Media only puts out 3.3v so what I meant was that I could connect the 3.3v to the 5v input of the explorer regulated with the xbee on it and it would power up normally.
I read up on the xbee power input before anything. As fas as the x-ctu, it does read both xbee's at 115200, and I can do At configs, just cant do any firmware updates after updating to 10CD. So i've stayed on 10CD. The robot communicates at 115200 and I have configured both xbee's at that speed and have set 2 stop bits on the hyperterminal with no improvement. So the captured output was using 115200.
Freddy Jan 30, 2010 by New to the Community ( 5 points). Thanks for the reassurance on the power! I tried googling for technical details on the robot but didn't come up with very much, except for one mention that its processor has a system clock of 200 MHz. That rang some alarm bells.
Now, I'm going to make a couple of assumptions here and then stick my neck out with a theory. The theory might still be broadly right even if the assumptions are wrong, but its case would be weakened. Assumption: the scenario you're describing is that an XBee is mounted on the robot, communicating with the second XBee attached to a PC. Assumption: you've found a way to tap in to a direct RS-232 connection on the robot (my googling suggested that the robot output was via USB). Observation: your hyperterminal capture does look very much like a baud rate mismatch. In fact, when characters are corrupted over a serial link there's very little other than extreme noise that can explain it. You say you tried two stop bits in hyperterminal but that it made little difference.
At 115200 baud, two stop bits at the PC end do make sense, so keep them in and keep reading. It's the serial link between the robot and its XBee that I now think may be causing the problem. If the robot system clock is 200 MHz, and if it uses the standard algorithm (that's two more assumptions.), it'll divide that clock by (16.
x) to get the baud rate, where x is the nearest integer to the theoretically correct value. The theoretically correct value for x is 200M / 16 / 115200 = 108.506, so the nearest integer is 109.
The robot's actual baud rate is therefore presumably 200M / 16 / 109 = 114,678.89 baud. However, the best the XBee with its 20 MHz clock can manage is 111,111.11 baud. The difference between these rates is 3.2% and that's rather a large difference.
So I think you may need to look at the robot-XBee link and adjust something. There are two possibilities: either set the robot to send two stop bits, or set the robot to use a custom baud rate as close as possible to 111,111.11 baud. To choose between the two possibilities: I would set two stop bits on the robot. If you change the robot's baud rate, you'll then re-encounter the original problem when you connect the robot directly to a PC. Jan 31, 2010 by Veteran of the Digi Community ( 464 points). Johnf, Your are correct in the setup you described and there is a serial connection available on the media board of the robot where I have soldered the radio.
So I am currently attempting (with the help from Helibot, a well known user at robocommunity.com) to set 2 stop bits or a diffrent baud rate on the robot, even to a 57600 rate that might be more reliable? I will post any updates ASAP thanks again for your in depth help on this.
Almost there! Freddy Feb 1, 2010 by New to the Community ( 5 points).
You can connect via the standard usb but it is a pain in the butt to setup as you have to have 2 bit of software running in the background on of the pc to keep the connection to the bot open. The 2 bit of software running in the background are used to create a virtual serial port for the RS media.
The serial hack is the way I would advise you to go. It isn’t that complicated to do as you just need to solder a few wires to the to media board inside the robot. The media board is located located under the plastic cover behind the neck. To remove this plastic cover you will need to unscrew all 8 screws(shown in the picture below) that connect the back plate to the chest plate. Next gentle move the chest plate forward.
You can now slide the plastic cover behind the neck forward and remove it to reveal the media board. You can now add the serial hack which is a matter of soldering wires to four of the pads media board as shown below.
I have now done the serial hack to 4 of the 5 RS media I have in this way and as long as you are careful it is easy enough to solder the wires to the board with out removing the board from the robot. The next thing to do is to add the TTL chip to the serial hack so you can communicate to the robot from the PC. There are 2 types of connection for the serial hack which are: Wired connection USB ttl chip which uses 3 wires (RX TX and GND) and Wireless Bluetooth TTL which uses 4 wires (RX TX GND and 3.3v) When I started off with the robots myself I used to use the USB TTL chip but found having the robot teathered to the pc was a pain so quickly move to the Bluetooth TTL chip. If you do decide to go for the Bluetooth chip you will still need the USB TTL chip in order to initially program it to a port speed of 115200 which is what the RS media uses. Author Posted on Categories Tags,.
My goal is to make a wireless serial connection to the robot as if it were wired to my laptop. I have 2 xb24 version 1084, usb explorer, explorer regulated. The Robot has rx, tx, gnd and 3.3v pads. As I understand it would be a AT transparent setup. 1) Phisical connection to Explorer Regulated from robot, DOUT = RX, DIN = TX, GND = GND. Is this correct? 2) What about power?
Can I connect the robot 3.3v to the explorer 5v (at the edge of the board) or should I connect directly to the 3.3v on the explorer (looks like direct to the 3.3v xbee pin) instead? 3) USB explorer on x-ctu on my laptop says USB Serial port (com4) so it looks like at least that module is connected. After soldering the explorer regulated to the robot pads, how do I connect to it? 4) I've read about firmware upgrade, is that needed for AT to proceed?
4) What next to make this serial connection happen? Jan 24, 2010 in by New to the Community ( 5 points). 3.3v to the explorer 5v works, also to the 3.3v pin1 on xbee. I'm not sure what you mean by this, but I hope it doesn't mean you're actually feeding 5V to the XBee. That would be a sure recipe for disaster. cannot downgrade to any firmware now to test others, connection to modem lost.
There are a few suggestions in the FAQ for dealing with the situation where X-CTU can't talk to the XBee. Version 10CD should be fine though (although it isn't the latest).
Reading between the garbled bits in the terminal printout, the far send seems to be reporting quite a few error messages - so something's apparently wrong there. Also, I'm guessing that the output is being generated at a fairly high rate. Given that, you're probably going to need to implement flow control on the connection in order not to lose characters. However, lack of flow control shouldn't lead to garbled characters. What was the baud rate you were using when you captured the output?
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Jan 30, 2010 by Veteran of the Digi Community ( 464 points). Hello Johnf, thanks for taking a look here.
The RS Media only puts out 3.3v so what I meant was that I could connect the 3.3v to the 5v input of the explorer regulated with the xbee on it and it would power up normally. I read up on the xbee power input before anything. As fas as the x-ctu, it does read both xbee's at 115200, and I can do At configs, just cant do any firmware updates after updating to 10CD. So i've stayed on 10CD. The robot communicates at 115200 and I have configured both xbee's at that speed and have set 2 stop bits on the hyperterminal with no improvement. So the captured output was using 115200.
Freddy Jan 30, 2010 by New to the Community ( 5 points). Hello Johnf, thanks for taking a look here. The RS Media only puts out 3.3v so what I meant was that I could connect the 3.3v to the 5v input of the explorer regulated with the xbee on it and it would power up normally. I read up on the xbee power input before anything. As fas as the x-ctu, it does read both xbee's at 115200, and I can do At configs, just cant do any firmware updates after updating to 10CD. So i've stayed on 10CD.
The robot communicates at 115200 and I have configured both xbee's at that speed and have set 2 stop bits on the hyperterminal with no improvement. So the captured output was using 115200. Freddy Jan 30, 2010 by New to the Community ( 5 points). Thanks for the reassurance on the power! I tried googling for technical details on the robot but didn't come up with very much, except for one mention that its processor has a system clock of 200 MHz. That rang some alarm bells.
Now, I'm going to make a couple of assumptions here and then stick my neck out with a theory. The theory might still be broadly right even if the assumptions are wrong, but its case would be weakened. Assumption: the scenario you're describing is that an XBee is mounted on the robot, communicating with the second XBee attached to a PC. Assumption: you've found a way to tap in to a direct RS-232 connection on the robot (my googling suggested that the robot output was via USB). Observation: your hyperterminal capture does look very much like a baud rate mismatch. In fact, when characters are corrupted over a serial link there's very little other than extreme noise that can explain it. You say you tried two stop bits in hyperterminal but that it made little difference.
At 115200 baud, two stop bits at the PC end do make sense, so keep them in and keep reading. It's the serial link between the robot and its XBee that I now think may be causing the problem. If the robot system clock is 200 MHz, and if it uses the standard algorithm (that's two more assumptions.), it'll divide that clock by (16. x) to get the baud rate, where x is the nearest integer to the theoretically correct value. The theoretically correct value for x is 200M / 16 / 115200 = 108.506, so the nearest integer is 109. The robot's actual baud rate is therefore presumably 200M / 16 / 109 = 114,678.89 baud.
However, the best the XBee with its 20 MHz clock can manage is 111,111.11 baud. The difference between these rates is 3.2% and that's rather a large difference. So I think you may need to look at the robot-XBee link and adjust something. There are two possibilities: either set the robot to send two stop bits, or set the robot to use a custom baud rate as close as possible to 111,111.11 baud. To choose between the two possibilities: I would set two stop bits on the robot. If you change the robot's baud rate, you'll then re-encounter the original problem when you connect the robot directly to a PC. Jan 31, 2010 by Veteran of the Digi Community ( 464 points).
Johnf, Your are correct in the setup you described and there is a serial connection available on the media board of the robot where I have soldered the radio. So I am currently attempting (with the help from Helibot, a well known user at robocommunity.com) to set 2 stop bits or a diffrent baud rate on the robot, even to a 57600 rate that might be more reliable? I will post any updates ASAP thanks again for your in depth help on this. Almost there!
Freddy Feb 1, 2010 by New to the Community ( 5 points).
Hi I bought 2 RSM's from ebay just before christmas for a total price of £110 both in working order(one had a broken lcd scene which I have since replaced). I was just going to add a serial hack them both tonight and when I open the 1st up to my suprise it alreadt has the serial hack cable already solder. Below is a photo.
Am I luck or what? Well thats not the end of it. I then open the other RSM which I bought at the same time and guess what, Yes the serial hack wires have been added to that one already as well. Below is the photo. That's amazing, how luck is that, it's save me a lot of work. I think going on how well the soldering is done on the hack and that both cables are identical this must have been done at the wowwee factory.
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Has anyone else opened there robot up to find the serial hack wiring is already done for you? I have already ugraded one of my RSM's to Firmware 2 and have added the serial hack with both wired and wireless connection.
Tonight I did the same setup on another bot other than the firmware upgrade which I will do shortly. I have put the bluetooth chip above the media board to the back and as it has and led on it I can see when it is powered up frombehind the bot. As you can't use both the wired and wireless chips at the same time to comunicate to the robot I have added a switch to cut power to the bluetooth chip which then allows me to connect via the USB-TTL module and communicate with the robot that way. Below are some pictures to show the of the mod have done. Cheers Gerber.
Hi Jjamie The USB-TTL chip is the one you advised me to order last september on MSN. I have only added a port for the USB-TTL just incase I need to connect via hardwire which will be very rarely I hope. Other than that the port cannot be seen as it is behind the door for the other connection ports on the robot. I will only be using the bluetooth to connect to the robot as I am going to connect all 4 of the RSM's I have wirelessly and control them in my software so don't want the hassle of lots of cables. Hi again Jamie This isn't meant to be a tutorial I was just showing Cirtainmaker and donnie what I did with the serial hack I added.
I will be putting a detailed tutorial on how I did this in the user manual for the next release of my software. I know there are already turtorials here on the forum for the serial hack. I am writing the tutorial into my software for anyone who wants to use it but it's primary use is as a reminder for me so I can remember how to do the same thing again at a later date if I ever get another bot. Hi Donnie There is some things the bot can do like track colours and track humans. Unfortunately I don't think it has voice recognition.
However in my software eventually you will be able to give voice command and the robot will do something like move a limb or play a song, but basically this will be done from my software on the PC and not be processed on the robot. Cada dia mas fuerte thalia descargar gratis. If you want to get your robot to copy your moves you could download Helibots COPYBOT from the download center which is a really cool app for the robot. Here is the link. My software is still in it's infancy but over the next couple of releases there will be loads of new features and enhancement.
I can't give an exact time scale for the next release date but hopefully it will be ready by the end of March as long as I don't hit any stumbling blocks along the way. I will keep you posted with my progress. Hi Gerber, Your software isn't the only software getting dev'ed at the moment, you just wait for the surprise;) Hi Donnie, I've been trying to compile some object recognition programs with no luck. Maybe I could somehow use RSM's inbuilt detection. I have also started on voice recognition.
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I have found the right module that will listen to voice and send raw serial commands to the RSM. They were only ideas, ModBot is discontinued and only has the Java hack. Will keep you posted on more news:-) Cheers, Jamie Kugelmann. Hi On the weekend I added the serial hack with both wireless and wired to the other 3 remaining bots I have, which means I now have 4 completely wireless bots. I changed my hack a little from the original one in pictures above in the thread. I have now put the switch and external usb-ttl connector on the back of the robot under the hand grip instead of under the cover on the side of the bot. The connecter and switch are still hidden from sight.
The reason I change the mod slightly is cause I didn't have to cut any holes in the robot which meant the overall hack took a lot less time to do and wasn't as fiddly to do. I took loads of pictures while doing the mod so in the next release of my software I hope to have full instructions on how to the same mod as I have done.
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Hopefully this will be helpful if other people want add the same serial hack as me. Jamie voice recognition on the bot with out doing any processing on the pc itself sound great. Can't wait to see it. When do you think this will be ready or is it still in the testing process? I am going to work on the multi bot control in my software this week. I'll give further news on my progress later in the week.
Cheers Gerber.