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Tyler Folsom
May 22, 2014, 5:56:46 PM5/22/14
to Elcano
Josh has solved the Nano upload problem! The right driver never got loaded. The right driver for one of Mega / Nano gets installed automatically, but not the other. The serial port that is visible from Arduino Nano is not the right one. Download to Nano now works!
The next problem is that the Trio board runs hot. With all processors on the board, and USB connected to C4 Nano, it draws too much USB power and shuts down the computer side of the USB. With external battery power to Trio, it feels a bit warm.
Because of the problem with USB, I powered the board from a 9.6 V battery.
A current meter shows about
60 mA: Mega ADK only on Trio board
100 mA: Mega and 1 Nano on Trio
130 mA: Mega and 2 Nanos on Trio
160 mA: Mega, 2 Nanos and UM6-LT orientation sensor on Trio
42 mA or 0.09 A: Mega only
62 mA or 0.13A: Mega and GPS shield
The fully loaded Trio board should draw much less than the 500 mA rating of the USB port. But at one point, I read 18 A from the fully loaded board and saw smoke. I suspect that it may be possible to short the 5V and ground pins that sick up from the Nano, so I have insulated those. I think I've found the problem: the Vin trace on the bottom of the Mega board has worn to bare copper, enabling a short of the 9.6V line.
- Tyler
The next problem is that the Trio board runs hot. With all processors on the board, and USB connected to C4 Nano, it draws too much USB power and shuts down the computer side of the USB. With external battery power to Trio, it feels a bit warm.
Because of the problem with USB, I powered the board from a 9.6 V battery.
A current meter shows about
60 mA: Mega ADK only on Trio board
100 mA: Mega and 1 Nano on Trio
130 mA: Mega and 2 Nanos on Trio
160 mA: Mega, 2 Nanos and UM6-LT orientation sensor on Trio
42 mA or 0.09 A: Mega only
62 mA or 0.13A: Mega and GPS shield
The fully loaded Trio board should draw much less than the 500 mA rating of the USB port. But at one point, I read 18 A from the fully loaded board and saw smoke. I suspect that it may be possible to short the 5V and ground pins that sick up from the Nano, so I have insulated those. I think I've found the problem: the Vin trace on the bottom of the Mega board has worn to bare copper, enabling a short of the 9.6V line.
- Tyler
Budi Mulyo
May 25, 2014, 5:53:28 AM5/25/14
to Elcano, Jim Kindsvater
Awesome news on the Nano Tyler!
And I'm glad you've found the faulty wire before too late.
RaaSIO is working on curriculum for Origami Robots and also Arduino robot called Hack-E-Bot, and I would like to incorporate Elcano also in there. I want to move beyond Lego Mindstorm because it's too expensive and not versatile enough.
And I'm glad you've found the faulty wire before too late.
RaaSIO is working on curriculum for Origami Robots and also Arduino robot called Hack-E-Bot, and I would like to incorporate Elcano also in there. I want to move beyond Lego Mindstorm because it's too expensive and not versatile enough.
Best wishes,
--
Budi Mulyo
Please consider funding and promoting my project:
http://ElcanoProject.orgElcano: an Open Source Ultra-Light Automated Vehicle
- Tyler
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Pat Tressel
May 25, 2014, 6:40:23 AM5/25/14
to Elcano
Tyler --
Josh has solved the Nano upload problem! The right driver never got loaded. The right driver for one of Mega / Nano gets installed automatically, but not the other. The serial port that is visible from Arduino Nano is not the right one. Download to Nano now works!
Which machine is that on?
The next problem is that the Trio board runs hot. With all processors on the board, and USB connected to C4 Nano, it draws too much USB power and shuts down the computer side of the USB.
As expected. That's what I was worrying about when the board was connected to my laptop -- you may recall me saying I sure hope the power management on my USB port is working, and it cuts off before blowing the USB port...
With external battery power to Trio, it feels a bit warm.
Because of the problem with USB, I powered the board from a 9.6 V battery.
A current meter shows about
60 mA: Mega ADK only on Trio board
100 mA: Mega and 1 Nano on Trio
130 mA: Mega and 2 Nanos on Trio
160 mA: Mega, 2 Nanos and UM6-LT orientation sensor on Trio
42 mA or 0.09 A: Mega only
62 mA or 0.13A: Mega and GPS shield
The fully loaded Trio board should draw much less than the 500 mA rating of the USB port.
The USB port is likely 100 mA not 500 mA. The computer mfr is not going to put in a more expensive part than they need.
But at one point, I read 18 A from the fully loaded board and saw smoke. I suspect that it may be possible to short the 5V and ground pins that sick up from the Nano, so I have insulated those. I think I've found the problem: the Vin trace on the bottom of the Mega board has worn to bare copper, enabling a short of the 9.6V line.
Yowza. That's 18 not 1.8? 18 as in two short of 20? Is this a different board, or could it have gotten damaged recently? Because I don't think it was doing that when we were working on it before. I'm generally very sensitive to the smell of hot electronics...
Remember, Fred Meyer, nice little plastic boxes, $1 each, just the right size...look in the aisle with hobby and school supplies.
-- Pat
Tyler Folsom
May 25, 2014, 12:56:50 PM5/25/14
to elcano-autono...@googlegroups.com, Jim Kindsvater
The Nano upload problem is not as solved as I thought. It had seemed to have been solved on all Windows machines in the lab, and on my Macbook Pro. The problem has come back.
Pat - Yes, eighteen amps. Thanks for the information about the 100 mA limit. Josh and I have organized the lab, putting all the components for each workstation into a plastic box. Getting small plastic boxes for transport and working is a good idea.
- Tyler
Pat Tressel
May 26, 2014, 3:26:37 AM5/26/14
to Elcano, Jim Kindsvater
Tyler --
The Nano upload problem is not as solved as I thought. It had seemed to have been solved on all Windows machines in the lab, and on my Macbook Pro. The problem has come back.
:-( Did it only stop working on some of the machines? If it stopped on both Windows and Mac, then I'd suspect the problem is on the Nano / board side.
Budi - Great! Let's figure out how to merge Elcano with what you are doing, and how to merge our lesson plans.
Pat - Yes, eighteen amps. Thanks for the information about the 100 mA limit. Josh and I have organized the lab, putting all the components for each workstation into a plastic box. Getting small plastic boxes for transport and working is a good idea.
Are you planning another work session? Just not this Saturday, because you should all come to the National Day of Civic Hacking:
http://www.meetup.com/Code-for-Seattle/events/175917132/
http://www.meetup.com/Code-for-Seattle/events/175917132/
-- Pat
Budi Mulyo
Jun 5, 2014, 11:10:22 AM6/5/14
to Elcano, Jim Kindsvater
This is what I have in mind: Using Arduino based robots I would like to teach Platooning experiments with robotic vehicles http://youtu.be/X_siyEVTKFQ
build exercises for 20 youth with maximum of 5 per group and minimum of 2
It meets Scrum method requirements since the final delivery can be split into <10 pieces, that each do something interesting on their own, and can be split back apart.
build exercises for 20 youth with maximum of 5 per group and minimum of 2
It meets Scrum method requirements since the final delivery can be split into <10 pieces, that each do something interesting on their own, and can be split back apart.
Best wishes,
--
Budi Mulyo
Please consider funding and promoting my project:
http://ElcanoProject.orgElcano: an Open Source Ultra-Light Automated Vehicle
--
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