 | | Re: Ultrasonic Sensor iS "Slow"
|
|
(...) The 15 ms that John reported is the time it takes for a sound pulse to travel 500 mm, the round trip distance at the maximum advertised range of the US sensor. An interesting coincidence? Roger Glassey (17 years ago, 11-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Ultrasonic Sensor iS "Slow"
|
|
Original Thread title was "Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed". I've renamed as worth a separate thread. (...) You're right!! If you poll the sensor too fast, it definitely reports wrong distances. I'm doing some (...) (17 years ago, 7-Sep-07, to lugnet.robotics.nxt)
|
| |
| | RE: NXT-G/ROBOTC Firmware Scheduler and Clump Priority
|
|
Holy cow! This is fun to read... I wish I have the time to further discuss this regarding the events handling with nxt. Follow up later. Thanks for such detailed info. --Elizabeth -----Original Message----- From: news-gateway@lugnet.com (...) (17 years ago, 7-Sep-07, to lugnet.robotics.nxt)
|
| |
| | RE: Ooops! NXT Software Comparison correction / I2C Messaging Speed
|
|
(...) I want to list both. First, the one-to-one mapping, and second (with some explanation) the code with a second task. Several other pieces of software have an "optimized" version of code, and it makes sense to do the same for NBC. Steve (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Re: NXT-G/ROBOTC Firmware Scheduler and Clump Priority
|
|
Wow! Very interesting posting. Thanks for revealing that, Dick! Zitat von Dick Swan <dickswan@sbcglobal.net>: (...) ---...--- This message was sent using IMP, the Internet Messaging Program. (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
|
| |
| | NXT-G/ROBOTC Firmware Scheduler and Clump Priority
|
|
In a typical operating system (OS), tasks are scheduled on a priority basis. The highest priority task always executes ahead of lower priority tasks. If there are multiple tasks at the highest priority, then they are typically executed in a round (...) (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
|
| |
| | RE: Ooops! NXT Software Comparison correction
|
|
(...) After tuning, NBC achieved 73K test cycles. It achieved these great results by setting the task "priority" to 200. Unfortunately, unless the NXT-G task scheduler has been rewritten, these results might be a little too high. A NXT-G task (or (...) (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
|
| |
| | RE: Ooops! NXT Software Comparison correction / I2C Messaging Speed
|
|
(...) Nobody cheated or is dishonest. Everyone who writes firmware for the NXT is well-intentioned "good" people. Let's not mislabel good modern programming practice -- i.e. hardware device drivers integrated into the low-level firmware -- as (...) (17 years ago, 6-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed
|
|
(...) I think I understand. In this case, the limiting factor is the US sensor itself, how fast it can ing and interprete a return. Or from my standpoint (a physicist), it's a fundemental limitation of the physics of sound, not a limitation that has (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Re: US-Sensor I2C-address
|
|
(...) To my knowledge the LEGO Ultrasonic sensor does not support changing its I2C address. IIRC it is hard-coded to 0x02. I do not think it is ADPA-compliant. John Hansen (17 years ago, 5-Sep-07, to lugnet.robotics.nxt.nxthacking)
|
| |
| | Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed
|
|
(...) The errors that occur are that the sensor does not properly report variable distances as it is positioned at varying distances from an obstacle. If you slow down the read rate then it works correctly (i.e., with a wait of ~15 ms between read (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Re: pbLua GUI ???
|
|
(...) I forgot the screenshot ;-) (URL) me: which of the connected NXTs is real ? One of this NXTs is software only (pbLuaAPI). Bye Christian (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Re: pbLua GUI ???
|
|
(...) New Eclipse version EUROPA (3.3) with LuaEclipse, RSE Target Management, RXTX and pbLuaAPI works excellent with pbLua ! You have direct access to all serial connected NXTs (Bluetooth and USB) from the Eclipse Workbench. A perfect professional (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed
|
|
Hi Dick, (...) actually I2C runs at something close to 12kHz in the LEGO firmware (I forgot the exact value). Jürgen (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Electronics Prototyping with the LEGO NXT
|
|
Hi Folks, I've been exploring various ways to use the LEGO NXT in enhancing electronics through Robotics and I've just posted a short video on the subject matter at my blog (URL). I'll be writing an eZCIRCUITs application note on the construction (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
|
| |
| | RE: Ooops! NXT Software Comparison correction / I2C Messaging Speed
|
|
(...) I wasn't aware of this firmware limitation. I could not duplicate it when using the ROBOTC firmware. I've done three different test runs of 500K messages each with perfect results each time. Each test run used a different sensor. The delay (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
|
| |
| | leJOS NXJ 0.4.0 is Released
|
|
NXJ version 0.4.0 now includes a full suite of graphical widgets in the java.microedition.lcdui package, a multi-level menu system, wireless NXT to NXT communications using Bluetooth, primitive wav file sound support, and many more enhancements. (...) (17 years ago, 5-Sep-07, to lugnet.robotics.nxt)
|
| |
| | US-Sensor I2C-address
|
|
Hello Community, is there currently a known way to change the I2C-Address of the Ultrasonic sensor ? What's the magic with the ADAP ? Thanks for some informations Bye Christian (17 years ago, 4-Sep-07, to lugnet.robotics.nxt.nxthacking)
|
| |
| | Re: pbLua GUI ???
|
|
(...) This is starting to look pretty promising as a standard IDE. I will do my part and install Eclipse here and get the instructions updated from Christian's instructions. Once we get a decent IDE the pbLua system may be almost ready for "everyone (...) (17 years ago, 3-Sep-07, to lugnet.robotics.nxt)
|
| |
| | Re: pbLua GUI ???
|
|
(...) ;-) currently I'm extending Eclipse with simple terminalprogram and pbLuaAPI... With pbLuaAPI-Wrapper(maps pbLua nxt.* to native Lua routines) you can test and run pbLua code at local PC before transfering to NXT... Christian (17 years ago, 3-Sep-07, to lugnet.robotics.nxt)
|
