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Electronics / Re: Hardware issue Axon II with Maxbotix EZ1 sonar
« Last post by Gertlex on February 23, 2016, 11:46:51 PM »
Sounds odd.  Just to check a few things... which pin(s) specifically are you using?  Do you have a large number of other devices attached to your Axon II?
Electronics / Hardware issue Axon II with Maxbotix EZ1 sonar
« Last post by Sasounet on February 22, 2016, 10:00:45 PM »

I am having trouble using a Maxbotix EZ1 sonar with the Axon II.

I use that sonar with its analog output pin. In fact I connect the sonar directly on one of the ADC header making sure the ground is connected to ground, power to power and signal to signal.

When I run the program, the sonar always output the same value; 12 cm (very small value, close to the minimum). I was hoping it was a software issue but it is not.

In fact, the sonar works perfectly, when connected to the same ADC pins, as long as it is not powered from the 5V regulated supply (middle pin). If I power the sonar from an external regulated supply and I connect only the ground and signal pins to the Axon then everything works fine (in fact I the ground pin of the sonar is attached to both ground from external power supply and ground pin on the ADC header on the Axon)

As per the spec, the 5V regulated power on the Axon can draw up to 1.5A. So I very much doubt the Sonar uses more than that!

So is this normal ? If not what could be the problem ?

Best regards.


Software / Re: Sonar problem, axon II, project builder
« Last post by Sasounet on February 22, 2016, 09:48:54 PM »
Thanks Greg for your reply. I realized now the problem is clearly a hardware issue. If you want, you can read my mail about it in the electronics forum.

Hi Francois,

I have a Axon II and a Axon and can confirm both work well with the EZ1.

Though I used Webbot Studio software then connected EZ1 to read out to a terminal program using the uart com through the usb.

Software / Re: Sonar problem, axon II, project builder
« Last post by mallster on February 18, 2016, 03:39:33 AM »
Hi Francois,

I have a Axon II and a Axon and can confirm both work well with the EZ1.

Though I used Webbot Studio software then connected EZ1 to read out to a terminal program using the uart com through the usb.

Software / Sonar problem, axon II, project builder
« Last post by Sasounet on February 17, 2016, 09:36:28 PM »

I am creating my first program with project builder/AVR studio. So far I have been able to control servos and stepper motors, read the switch status etc. All is well and fun.

However I can not get my Maxbotix EZ1 sonar (supported by project builder) to work. It keeps reporting a distance of 12 cm whatever the conditions. I tried diffrent ADC pins with the same result.

I have tried the sensor with only a voltmeter and regulated power supply attached to it. The voltage values I read make sens and varie a lot when pointing the sensor around as it should. So I think it is safe to assume the sensor works.

It may be the Axon II ADC system that is broken ? So here what I checked.

I tried running the same program on the Axon II without having the sensor connected to the ADC pin in order to see if it would still report a value of 12 cm. Without the sensor connected, the reported value is quite large (like 450 cm or something). Measuring the voltage with an volt meter between the ground pin and the signal pin on the applicable ADC slot when nothing is connected to it and the controller is running returns close to 0 volts. (0 Volt and the value returned is the maximum range... strange)

Measuring the voltage between the same two pins while the sensor is connected return the right amount of volts, like when I tested the sensor alone.

I don't know what to conclude about the Axon II integrity I must admit...

Now I was thinking, maybe it is a problem with the Maxbotix EZ1 sonar librairy that no one discovered yet. So if I can ask the Axon to give me the voltage on the ADC pin I will know if the ACD circuit is working.

From the online documentation, I concluded that all sensors can respond to the method ".getVolts". To my surprise it is not the case or I don't know how to do it because I get the following error:

project1.cpp:46: error: 'class Ez1' has no member named 'getVolts'

Anyone can help ???

Thank you,

Mechanics and Construction / Re: Help with Wiper Motor wiring
« Last post by bdeuell on February 17, 2016, 06:34:12 PM »
From the pictures i would likely agree with your assumptions

HOWEVER i highly advise you to check the connections with a multimeter before connecting it to a battery ESPECIALLY a lithium battery.

if you measure between ground and the assumed motor connections you should see a low resistance but more not a short. I would also check the resistance between each of the terminals to be sure i understand exactly what all of the connections are before connecting any power. If you can turn the motor slowly while checking the resistance so you can see if the park switch opens and closes.

DEFINITELY connect a fuse in series with your battery so if anything does happen to go wrong you have some level of protection in your circuit. I would also recommend testing it with a different power source before connecting a lithium battery that has a much higher risk of starting a fire.

I dont know how much experience you have with electronics but if you are still unsure about what you are doing ask more questions or better yet find someone who can help you hook the motor up.
Software / how is error used to find the transformation between two set of points?
« Last post by chaiein on February 16, 2016, 11:06:19 PM »
Say I have 3 set of 3D coordinate points. Let a object at First X1=(x1,y1,z1) moved to  X2=(x2,y2,z2). From X1 to X2 say the transformation(R,T) is calculated which may give X2=R1*X1+T. Due to noise there can be error is the equation of values of R, T. How is this error used in correcting the R, T values.
Mechanics and Construction / Help with Wiper Motor wiring
« Last post by patrickstefanski on February 16, 2016, 09:32:28 PM »
  I'm working on a pretty basic project with a Wiper motor.  I basically just want it to spin on it's "fast" setting while connected to a LiPo.  I bought an aftermarket one on the cheap and I can't seem to find a wiring diagram anywhere.  I did a bunch of research and I think i have the basic idea of it, i would just like someone with the know-how to either confirm or correct my assumptions.  Below are pictures of the wiring:

here are my assumptions I am hoping to get confirmed or corrected: The Red and White wires are heading into the same spot as the black (ground). So I'm assuming my Red and White are the fast/slow wires, but I'm not sure which is which. The green/yellow wires are going into a different part of the motor so I'm assuming those are the park brake (which I don't really have a need for).

One of my main questions is about the ground. There is an end sticking up. An end going in the same spot as the Red/White, and an end wired to the manifold. I have no clue what to do with that.

My assumption about how to get this to work is if I can connect the (-) to the ground and the (+) to either the slow or fast wire it will spin either slow or fast respectively. And reversing the (+)(-) on the same wires will make it spin in the opposite direction. Is that correct?

Assuming all my assumptions pan out, what do I need to do to (1) Properly set up the ground wire to wired to a LiPo and (2) Square way the yellow and green wire so they don't interfere with everything else.

Any help would be greatly appreciated and I look forward to learning a lot from you guys and your projects.

Misc / DARPA - Unmanned ship just unveiled
« Last post by mklrobo on February 15, 2016, 06:57:26 AM »
 ;D Hello!

   DARPA just unveiled a unmanned robot ship to be used for submarine tracking, recon, and cargo delivery.
Just a taste of things to come! (On bing)  ;) :) :D ;D
Robot Videos / Re: The MeccaNoid Android App. is frustrating to use and buggy
« Last post by MeccaNoid Madness on February 12, 2016, 11:44:15 AM »
I just learned, Spinmaster has contracted with Google to re-write the App.. Spinmaster is just a toy maker, Google is a good software/hardware engineering Giant. Having Google re-write the App. may take some time but they will make something much better then what they have now. The MeccaNoid has a lot of potential, now that Google is re-write the App.

WOW - Imagine having the powerful capability of "Google Now" in the App. I am excited now, but is will take Google some time.

Imagine Asking Meccanoid, what is the weather NOW, what is the stock market NOW, what is traffic NOW, what is .......  NOW, and have the correct answers - Wow that is kool

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