http://forums.leaflabs.com/topic.php?id=1315 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:06:53 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=1315&page=2#post-21251 Fri, 23 Nov 2012 17:43:55 +0000 blu3r4y 21251@http://forums.leaflabs.com/ <p>Hi ezerg,</p> <p>sorry for the late response, we had various difficulties with this WiFi thing so we put it aside for the moment.<br /> It would be really hard to read in a camera module fast enough on a microcontroller, consider a possibly needed compression or encoding of this video/frames and eventually transmit all this data at a acceptable speed over WiFi to a base station or end device.</p> <p>For this process, each component in our system should be really fast. However, a video stream isn't our main objective of our quadrocopter. It's much more important to ensure a stable connection between the quadrocopter and an end device, which transmits RC signals and other control information.</p> <p>Therefore we decided to separate the video transmission and our control signals. By now, we are focusing on the RC signal transmission over XBee. XBee also uses the 2.4 GHz frequency band, but compared to WLAN it is much easier to handle and is also suitbale for longer distances (up to 1.6 km with XBee Pro), which is very useful for a quadrocopter. ;)<br /> Our XBee module works fine, we are able to steer our quadrocopter from a desktop PC wirelessly.</p> <p>For the camera, we are using a easy all-in-one solution from HobbyKing (<a href="http://www.hobbyking.com/hobbyking/store/__22824__2_4GHZ_100mW_Tx_Rx_1_3_inch_CCD_Camera_PAL_520TV_line_.html)" rel="nofollow">http://www.hobbyking.com/hobbyking/store/__22824__2_4GHZ_100mW_Tx_Rx_1_3_inch_CCD_Camera_PAL_520TV_line_.html)</a>.</p> <p>At the moment, we are still improving our client- and µC-programs.</p> <p>Well, especially in the last few weeks we thought about a base station with WiFi capability. So, we would have:<br /> Quadrocopter &lt;--XBee--&gt; Base Station &lt;--WiFi--&gt; PC / smartphone / webserver / ...</p> <p>This would make it possible to control the quadrocopter with multiple devices.<br /> I'm still looking for the best WiFi solution. As i mentioned in earlier posts I would go with the RN-171 or RN-131 from Roving Networks / Microchip (<a href="http://www.microchip.com/pagehandler/en-us/technology/wifi/products.html)" rel="nofollow">http://www.microchip.com/pagehandler/en-us/technology/wifi/products.html)</a>. The datasheet says that it could handle up to 2 Mbps.</p> <p>It still will a take a few weeks or even months to finish this whole project and this WiFi possibility. I will remind me to keep you up to date with any results, according to this WiFi modules.</p> <p>Mario. </p> http://forums.leaflabs.com/topic.php?id=1315&page=2#post-11476 Sat, 30 Jun 2012 20:37:44 +0000 ezerg 11476@http://forums.leaflabs.com/ <p>Hi!, your project worked? have you been able to achieve speeds greater than 1mbps?<br /> I´m in a similar project, i need to transfer high quality audio trough wifi...<br /> I would like to know your experience...<br /> Thanks! </p> http://forums.leaflabs.com/topic.php?id=1315&page=2#post-10389 Fri, 27 Apr 2012 12:43:24 +0000 x893 10389@http://forums.leaflabs.com/ <p>So not use this datasheet.<br /> I use arduino library and microchip library. </p> http://forums.leaflabs.com/topic.php?id=1315#post-10387 Fri, 27 Apr 2012 11:04:27 +0000 hereiam 10387@http://forums.leaflabs.com/ <p>But I have seen, that there is no description about the registers how they have to be initialized at startup and of course register description about their functionality.</p> <p>Is there a more detailed datasheet with register description? </p> http://forums.leaflabs.com/topic.php?id=1315#post-10385 Fri, 27 Apr 2012 10:09:45 +0000 x893 10385@http://forums.leaflabs.com/ <p>@hereiam: Of course you can use this datasheet </p> http://forums.leaflabs.com/topic.php?id=1315#post-10384 Fri, 27 Apr 2012 08:09:56 +0000 hereiam 10384@http://forums.leaflabs.com/ <p>@x893: So can I use ZG2100 datasheet from here <a href="http://ww1.microchip.com/downloads/en/DeviceDoc/70624A.pdf" rel="nofollow">http://ww1.microchip.com/downloads/en/DeviceDoc/70624A.pdf</a> to create a driver for MRF24WB0MA module? </p> http://forums.leaflabs.com/topic.php?id=1315#post-9813 Sun, 18 Mar 2012 14:32:27 +0000 blu3r4y 9813@http://forums.leaflabs.com/ <p>Hi,</p> <p>i haven't searched on purpose yet. At present, I have found a supplier in Germany:<br /> <a href="http://www.shop.display3000.com/elektronikmodule/ethernet-wlan/wiznet-wiz610wi-wlan-wifi.html" rel="nofollow">http://www.shop.display3000.com/elektronikmodule/ethernet-wlan/wiznet-wiz610wi-wlan-wifi.html</a></p> <p>I don't know if this would be an option for you.</p> <p>Have you ever experimented with huge data rates using the ethernet module from WIZnet? Maybe they use the same serial interface to the microcontroller. </p> http://forums.leaflabs.com/topic.php?id=1315#post-9812 Sun, 18 Mar 2012 14:19:29 +0000 feurig 9812@http://forums.leaflabs.com/ <p>Mario,</p> <p>Both wiznet and mouser seem to be out of that. (I have been working with their Ethernet module -- wiz810). Do you have a secret supplier at present?</p> <p>There is a stack for the mrf for the arduino originally from asynchlabs/now supported by rugged circuits. <a href="http://asynclabs.com/wiki/index.php?title=WiShield_library" rel="nofollow">http://asynclabs.com/wiki/index.php?title=WiShield_library</a> At present however the disparity between arduino/wiring current and libmaple have made porting efforts a little difficult.</p> <p>Don. </p> http://forums.leaflabs.com/topic.php?id=1315#post-9811 Sun, 18 Mar 2012 13:05:01 +0000 blu3r4y 9811@http://forums.leaflabs.com/ <p>Hi poslathian,</p> <p>thanks a lot for your advices on using WiFi modules! I will keep them in mind.<br /> Because of your speed tests, I checked the datasheets of the WiFly RN-171 (<a href="http://bit.ly/WiFly-RN-171" rel="nofollow">http://bit.ly/WiFly-RN-171</a>) and RN-131G/C (<a href="http://bit.ly/WiFly-RN-131G)" rel="nofollow">http://bit.ly/WiFly-RN-131G)</a>.</p> <p>According to them the RN-131G only supports up to 1 Mbps sustained data rate with UART. With this module it wouldn't be possible to get faster data rates!<br /> However, the RN-171 supports a data rate of 921 Kbps, over UART. And with SPI, up to 2 Mbps.</p> <p>Most WiFi modules and camera modules with UART only support ~ 1 Mbps at maximum. I think UART can't go any faster! Maybe that's the reason why your WiFi module didn't answer any longer, at such high baud rates?</p> <p>For our project, the RN-171 WiFi module, connected over fast SPI, would be a nice choice if we really reach the 1-2 Mbps.</p> <p>At the moment, i have found another WiFi module. WIZnet overs some great serial WiFi modules with "54Mbps data rate and Max.20Mbps Effective Data Transmission". If we only reach a tenth of this 20 Mbps it would be really awesome! :) In their datasheet they also mention "IP cameras" as a possible application example.</p> <p>Here is the link to the WIZnet610wi module:<br /> <a href="http://www.wiznet.co.kr/Sub_Modules/en/product/Product_Detail.asp?cate1=5&amp;cate2=43&amp;cate3=0&amp;pid=1020" rel="nofollow">http://www.wiznet.co.kr/Sub_Modules/en/product/Product_Detail.asp?cate1=5&amp;cate2=43&amp;cate3=0&amp;pid=1020</a></p> <p>Hi feurig,</p> <p>Phew, that would be a lot of work to write a protocol stack on your own. The memory wouldn't be the problem, we will use a powerful 72 MHz 32bit controller with lots of flash space.<br /> However, it would be great to outsource this task to the WiFi module, so the WiFly, GainSpan or WIZnet module would be a better choice.</p> <p>Kind regards,<br /> Mario </p> http://forums.leaflabs.com/topic.php?id=1315#post-9004 Sat, 17 Mar 2012 01:03:08 +0000 feurig 9004@http://forums.leaflabs.com/ <p>x893 I take it thats a no.<br /> blu3r4y the mrf modules will require that you write/port your own stack. On the arduino that would eat half of the memory and a good chunk of the flash. On the arms its not such a big deal. </p> <p>Most of the serial modules (wifly, gainspan) do most of the tcp/udp and lower layers for you, you pretty much get a couple (8) of streams and a lot of at/escape work to do. </p> http://forums.leaflabs.com/topic.php?id=1315#post-8653 Thu, 15 Mar 2012 13:46:51 +0000 poslathian 8653@http://forums.leaflabs.com/ <p>Mario,<br /> You are going to have a tough time getting above 1Mbps. I have done lots of work with various Maple baords linked to the roving networks modules (rn131g or 117). a few quick notes on using that module, which generally works well but:</p> <p>1) Use an external antenna, seriously, even just one of those foil fractal antennas makes the connection reliability sky rocket. The chiptenna just sucks.</p> <p>2) Wire up the hardware flow control DTR and CTR. If for whatever reason the connection gets blocked, the FIFO on the wifly chip will fillup, and new bytes will get dropped on the floor and you will never know. The flow control lines will tell you when the FIFO is full. Having bytes drop with no warning pretty much defeats the purpose of TCP!</p> <p>3) Ostensibly the Maple UARTS can go pretty fast, and support the higher data rates above 115200 that the wifily supports (something above 900000) but whenever I tried those modes I could not get the wifly to talk to me at all any more. I had to do a hard wifly reset, which is a bit of a pain and involves holding some pin high on power up and then toggling another line 5 times slowly (1Hz) to reset to the default 9600 baud. </p> <p>You should have no problem getting 115200Kbs, and probably faster, but I have never seen that really fast modes work. </p> http://forums.leaflabs.com/topic.php?id=1315#post-8595 Mon, 12 Mar 2012 17:15:59 +0000 blu3r4y 8595@http://forums.leaflabs.com/ <p>Woha, thanks guys! Your replies are very useful to me! :)</p> <p>The MRF24WB0MA WiFi SPI Chip looks very interesting to me, SPI would be very fast and easy.</p> <p>One last question, did you ever use on of your WiFi Shields / Chips to transmit a huge amount of data? I would like to build up a Live Video Stream. For this usage a reliable data rate of 1-2 Mbps would be required.<br /> If possible, could you tell me your experiences on this?</p> <p>Regards, Mario </p> http://forums.leaflabs.com/topic.php?id=1315#post-8286 Mon, 20 Feb 2012 13:12:16 +0000 feurig 8286@http://forums.leaflabs.com/ <p>Some friends of mine and I have done a little work with these modules which is why i asked about working stm code. (see: <a href="http://www.wifimidi.com" rel="nofollow">http://www.wifimidi.com</a> which is our arduino based product) </p> <p>It has proved less than trivial sometimes however to port arduino code to the maple. </p> http://forums.leaflabs.com/topic.php?id=1315#post-8280 Mon, 20 Feb 2012 12:43:59 +0000 Cyclegadget 8280@http://forums.leaflabs.com/ <p>MRF24WB0MA(new) WiFi SPI communication, Jtag, and Serial Debug.</p> <p>Here is the data sheet. They say there is a downloadable TCP/IP stack for microchip controllers. Maybe there could be some useful code from that.</p> <p><a href="http://ww1.microchip.com/downloads/en/DeviceDoc/70632A.pdf" rel="nofollow">http://ww1.microchip.com/downloads/en/DeviceDoc/70632A.pdf</a> </p> http://forums.leaflabs.com/topic.php?id=1315#post-8273 Mon, 20 Feb 2012 01:44:03 +0000 feurig 8273@http://forums.leaflabs.com/ <p>x893 can you point us at the code you used for the mrf modules? </p>