Subject:
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Nemesis4Lego controller
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 1 Jun 2005 00:42:28 GMT
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Viewed:
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926 times
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Danny & all,
This was a prototype that I have built with regular parts. If there will be
demand, I will make and order PCBs. The total cost of the parts is around $30.
Add $10 for labor (and that is verry modest) and you'll get the price. The size
can be even smaller than what I ended up with! I mean the height can be 1 plate
(for contacts) at the bottom, 1 brick, 2 plates on top.
KronosRobotics are the manufacturers of the microcontrollers. Michael Simpson
has taken a 16C84 or something like that and created a firmware and uploaded it
into these chips. And he created the free software (Basic) so anyone can program
them pretty easily. They work like a BasicStamp controller. And the software has
a Simulator and a Debug window, where you can see the sensor values, etc. so you
don't realy need a LCD.
They have 2 controller classes: Dios and Athena. Dios is more powerfull and
bigger. Athena is cheap, low speed and memory. In Athena class there are 3
controllers: Athena ($6.95), Perseus ($8.95) and Nemesis ($12.95). Athena and
Perseus are great to make the slaves and Nemesis the Master. These controllers
do not support multitasking.
However, IF someone (i.e. Michael Simpson) agrees to modify the firmware, They
can be perfect for small Lego controllers. What needs to be modified? The IR
protocol for instance, to be able to work with Lego Remote and talk to RCXs.
Perhaps he will do that if there is a real demand.
Mean while, I will try to make it work, allthough it is verry hard for me. I am
not an engineer and I do not understand the terms and how IR and serial
protocols work. All I did was put together some examples and application notes
from their website. And after I have read the Boe-Bot manual I understood how to
use the Panasonic IR sensors to do proximity detection and even distance
measurements (left and right).
The controller that I have built (put together) can work with up to 7 Lego
active sensors. I have chosen to make it work with only 2, so I can use another
2 input/outputs for 3 pin sensors or to command 2 servos. And of course, 2 for
the IR sensors. Actualy, I have seen that it can be done with only one sensor
with 2 separate IR Leds. Fire left - measure, fire right - measure. Also, the
motor driver has an Enable pin that can be used to ramp up/down the speed verry
smooth. The motors are running at 9v like on a RCX.
There are more ways to do a master-slave comunication with these controllers. I
thought the easiest way to do it will be using the serial bus that is used to
program them. This bus has 5 pins: -,+(5v),Rx,Tx,Atn. I am considering adding
another pin for +9v, so they can get power from the Master - for the motors. Or,
have the slaves have their own Lego power connector...
Possible Slaves:
2 sensors slave, using a Athena micro.
4 sensors slave, using a Athena micro.
2 sensors, 2 motors slave, using eighter Athena or Perseus (faster) micro.
LCD slave, using a Athena micro.
Speak slave, using a AthenaHS and a SpeakJet.
All the slaves can have up to four 3 pin ports to connect to servos or 3 pin
sensors.
All in all, this is a fun project for me, and if there is a real demand, I will
consider building more units. I will make some Slaves for myself and keep you
all posted with the results.
Gabriel
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Message has 1 Reply:
 | | Re: Nemesis4Lego controller
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| (...) Gabriel, please do keep working on this! It's exactly the sort of thing I've been looking for for years. I get frustrated with the high cost and hard limits of the RCX; it sounds like your units would be far superior in terms of entry cost and (...) (19 years ago, 1-Jun-05, to lugnet.robotics)
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