Jee Labs Talk » Tag: robot

Jee Labs Talk » Tag: robot - Recent Posts http://talk.jeelabs.net/tags/robot Discussion about Jee Labs projects en-US Sat, 11 Sep 2010 02:56:36 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://talk.jeelabs.net/search.php jsmirnio on "Asuro Modifications" http://talk.jeelabs.net/topic/436#post-2355 Sun, 25 Jul 2010 15:47:02 +0000 jsmirnio 2355@http://talk.jeelabs.net/ Congratulations on your successful modifications of the ASURO robot platform. Based on your experience, is it possible (and worthwhile) to modify the robot to add a 3.3V or 5v regulator for the MCU supply - while retaining a 5.8 (NiCd or NiMH) or 6V (alkaline) supply for the H-bridge circuit? Your advice will be most appreciated. JGS P.S. What about running the ASURO on a LiPoly battery at 3.7V? Will that work? kellerza on "Help Several rfm" http://talk.jeelabs.net/topic/101#post-439 Mon, 04 Jan 2010 20:42:48 +0000 kellerza 439@http://talk.jeelabs.net/ Neat, http://www.rocketnumbernine.com/2009/06/13/bidirectional-level-converter-pcb/ could almost be a 3.3V to 5V level shifting "AnyVoltage" JeePlug :) Jean-Claude on "Help Several rfm" http://talk.jeelabs.net/topic/101#post-436 Mon, 04 Jan 2010 17:06:08 +0000 Jean-Claude 436@http://talk.jeelabs.net/ Fascinating stuff - I also found this article: http://www.rocketnumbernine.com/2009/04/10/5v-33v-bidirectional-level-converter/ kellerza on "Help Several rfm" http://talk.jeelabs.net/topic/101#post-431 Mon, 04 Jan 2010 10:38:15 +0000 kellerza 431@http://talk.jeelabs.net/ If you want to connect serial busses (SPI for rf12) I'd suggest bidirectional level shifters A bi-directional level shifter can easily be done with a FET (I use a BS170, TO-92 package), which mounts easily on a port expander board. FET bi-directional level shifter: Connect the Gate-PIN to the lower voltage supply/v+/3.3V Connect the Source-PIN to the lower voltage data pin Connect the Drain-PIN to the higher voltage data pin Both circuits must share ground and you need pull-ups on both sides To send data, you have to change mode to output and set value to 1/0 To receive data with pullups, set the mode to input and set the pin to 1 (activates pullup) These FETs are cheap and quite versatile, connecting it up differently you can easily switch higher voltage/current outputs. Gate on uC, Source on GND, Drain on Load, load connected to higher voltage (5V/12V etc) Tyran on "Help Several rfm" http://talk.jeelabs.net/topic/101#post-429 Mon, 04 Jan 2010 08:32:09 +0000 Tyran 429@http://talk.jeelabs.net/ Hello can I use several rfm12 at the same time? (yes I know only b provides grouping) The idea is a robot passing through and connecting to several receivers then listening theirs response (one at a time of course)... The problem with the rfm12b is the logic level because of the robot and sensors that receive for example output from an opamp so I wanted to keep the 5V there. But If I choose the rfm12b can the outputs of the transceivers connect directly to my uC? And on the other way around (controller->transceiver) I would use a resistor voltage divider. Appreciate any help :) Thanks :P Jean-Claude on "JeeNode with USB interface" http://talk.jeelabs.net/topic/24#post-53 Mon, 07 Sep 2009 07:50:13 +0000 Jean-Claude 53@http://talk.jeelabs.net/ 1) the RFM22 logic is different, and requires a different driver - see also the comments here: http://news.jeelabs.org/2009/08/26/room-plug-design/#comments 2) you cannot connect the RFM module directly to a servo controller, neither one would know what to do, you need a microprocessor and software in between 3) not on the same radio frequency 4) see http://shop.jeelabs.com/pages/shipping 5) technically, it could, but the RF12 driver software would need to be adjusted, and it may be too much work for one JeeNode to handle two RFM12B's at the same time and do something useful with the data streams 6) only one I know of, is about the same as a JeeNode: http://code.google.com/p/strobit/ 7) SPI, see http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus No, you're not asking too much, but I suspect that you're [i]expecting[/i] too much :) Sending servo information and especially streaming video back at the same time will require more cpu power, buffer storage, and RF bandwidth than a basic JeeNode can handle. It may work on a single JeeNode if you send only a very small image every few seconds but even that will take some careful design and use of available resources. decarus on "JeeNode with USB interface" http://talk.jeelabs.net/topic/24#post-52 Mon, 07 Sep 2009 06:14:38 +0000 decarus 52@http://talk.jeelabs.net/ 1) Hmm~~ I'm starting to get how it works. But is it possible to replace ur RFM12B with a RFM22(higher data rate,30Mhz crystal oscillator)? 2) (http://www.hoperf.com/pdf/RFM22_transmit_DEMO.pdf) is this the way i should connect the RFM22/12B to the servo controller? The servo controller have 2 connection UART/FTDI & USB. Let say(example) I have two transceiver. One is connected to the computer (RFM22/12B ->JEE-NODE -> USB-BUB[UART]-> Computer[USB]) and another is connected to the servo controller (RFM22/12B ->JEE-NODE (necessary?) -> Servo controller[UART interface] ) is JEE-NODE necessary or can the RFM22/12B connect directly to the uC of the servo controller. 3)wait~ can one of the transceiver receive and send data at once?(Send command to servo controller while receiving video data from camera) 4)How much is the cost of shipping to malaysia? (possible?) 5)Can one JEE-NODE control two RFM22/12B? 6)IS there any other board that can convert RFM22/12B to UART other than JEE-NODE 7)The RFM22/12B pins are too complicated. What kind of pin(interface) is that? sry if i'm asking too much. :P Jean-Claude on "JeeNode with USB interface" http://talk.jeelabs.net/topic/24#post-49 Sun, 06 Sep 2009 11:25:58 +0000 Jean-Claude 49@http://talk.jeelabs.net/ 1) I use a JeeNode (obviously) - with a little USB-BUB board which converts USB to FTDI. The benefit is that you only need one USB connection, and can plug different JeeNodes in as needed. 2) You could use the Arduino's "Servo" library, which would work with up to 8 servo's on the JeeNode I/O pins. For more servo's I'd use the (upcoming) "Expander Plug", but for really precise control a dedicated I2C or serial controller such as the one you mention is no doubt better. For the cameras, you have to be careful with the amounts of data you want to buffer and send. I've been able to get a C328 going, but only at very low resolutions because of the amount of data involved. This is one of the reasons why I'm adding extra memory via I2C EEPROM chips. Good luck with your project :) decarus on "JeeNode with USB interface" http://talk.jeelabs.net/topic/24#post-48 Sun, 06 Sep 2009 07:41:15 +0000 decarus 48@http://talk.jeelabs.net/ Hi.JeeNode has caught my attention cause it uses the RFM12B. I've seen the "Building the JeeNode v3" but that required a etched PCB. my question is: 1) How to make the RFM12B connect to a computer via usb (does it need to have a uC) 2) How to make the RFM12B connect to a servo controller(http://www.cytron.com.my/datasheet/ServoController/SC16A_User%27s_Manual.pdf). my purpose is to make a wireless connection between the computer and the servo controller using two RFM12B. If possible a camera too =D. any help would be greatly appreciated.. thank you