[TriEmbed] New TOF distance sensor
Charles McClelland
chip at mcclellands.org
Sat Feb 14 10:36:53 CST 2015
Rodney,
Sure, here is what I am thinking.
I am working with walkyourcity.org <http://walkyourcity.org/> to see if putting up signage in downtown Raleigh will increase pedestrian traffic. To measure this, we have been putting an 18” cable guard across the sidewalk with a vibration sensor inside. When a pedestrian steps on the cable guard, we register an event.
There are a couple advantages with this approach:
- cable guards do not attract much attention
- the sensor is completely hidden and protected
- power usage is low so we can leave it for a couple weeks
However, there are some downsides as well:
- it can’t tell which side of the sidewalk the person is on (can infer direction)
- it might not count each pedestrian if two cross at the same time
- sometimes the cable guard gets moved especially on trash day (don’t ask)
So, I was thinking about a sensor which could be mounted on a pole between the street and the sidewalk and oriented (perpendicularly?) to the walkway. Then we could count each unique range getting a better count and perhaps even getting a sense of which way folks are walking (if you assume Americans walk on the right most of the time).
Some thoughts:
- IR beam - having to put a reflector on the other side and worry about alignment could be an issue
- TOF - cool but unless you want to spend 150 Euros for the CERN model, <http://www.teraranger.com/product/teraranger-one-distance-sensor-for-drones-and-robotics/> will lack the range needed.
- Ultrasonic - Expensive if you want one that works outdoors <https://www.sparkfun.com/products/11724> and don’t get be started on those cheap Chinese HC-105s - also power hungry
I think I will try this Ultrasonic sensor <https://www.sparkfun.com/products/8504> for a test unless you or anyone else on the list might have a better suggestion.
Thank you all in advance.
Charles McClelland
chip at mcclellands.org <mailto:chip at mcclellands.org>
919-624-5562
> On Feb 13, 2015, at 5:01 PM, Rodney Radford <ncgadgetry at gmail.com> wrote:
>
> Could you describe what you are hoping to measure, or your intent?
>
> Perhaps there are alternatives...
>
> On Feb 13, 2015 3:30 PM, "Charles McClelland" <chip at mcclellands.org <mailto:chip at mcclellands.org>> wrote:
> Rodney,
>
> Glad you mentioned the short range, was about to buy one! Looks like I will need to use the good old fashioned ultrasonic sensor unless someone knows of a version with a 3m range.
>
> I am interested in one that can be used outdoors and will be able to ignore noise. I have used the cheap HC-105 but they are too unreliable. The Maxbotix sensors are much better but 5x the price. The outdoor version <http://www.amazon.com/Maxbotix-MB7060-XL-MaxSonar-WR1/dp/B00A7YH6M4/ref=sr_1_1?s=industrial&ie=UTF8&qid=1423859198&sr=1-1&keywords=outdoor+ultrasonic> is more expensive sill at $100.
>
> Any other ideas for an outdoor distance sensor that would be reliable and resistant to noise?
>
>
> Charles McClelland
> chip at mcclellands.org <mailto:chip at mcclellands.org>
> 919-624-5562 <tel:919-624-5562>
>
>
>
>
>
>> On Feb 13, 2015, at 1:36 PM, triembed-request at triembed.org <mailto:triembed-request at triembed.org> wrote:
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>> Today's Topics:
>>
>> 1. Re: [TAR] New TOF (time of flight) distance sensor from
>> Sparkfun (Randy Farmer)
>> 2. Re: [TAR] New TOF (time of flight) distance sensor from
>> Sparkfun (Rodney Radford)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 13 Feb 2015 13:21:19 -0500
>> From: Randy Farmer <randy.farmer at gmail.com <mailto:randy.farmer at gmail.com>>
>> To: trianglerobotics at yahoogroups.com <mailto:trianglerobotics at yahoogroups.com>
>> Cc: TriEmbed Discussion <triembed at triembed.org <mailto:triembed at triembed.org>>
>> Subject: Re: [TriEmbed] [TAR] New TOF (time of flight) distance sensor
>> from Sparkfun
>> Message-ID:
>> <CAFKBHwNp240BVWLAbr1vArmSKeCa7T84gy=iUSYFjkAqN+dOCA at mail.gmail.com <mailto:iUSYFjkAqN%2BdOCA at mail.gmail.com>>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Cheaper breakout with just the sensor:
>>
>> https://www.sparkfun.com/products/12784 <https://www.sparkfun.com/products/12784>
>>
>>
>> On Fri, Feb 13, 2015 at 1:14 PM, Rodney Radford ncgadgetry at gmail.com <mailto:ncgadgetry at gmail.com>
>> [trianglerobotics] <trianglerobotics at yahoogroups.com <mailto:trianglerobotics at yahoogroups.com>> wrote:
>>
>>>
>>>
>>> If you are on the Sparkfun mail list, you probably already got this, but
>>> this guy is interesting enough to warrant an announcement just in case.
>>>
>>> https://www.sparkfun.com/products/12785 <https://www.sparkfun.com/products/12785>
>>>
>>> It is a $24.95 TOF (time of flight) distance sensor - this means that it
>>> actually measures the amount of time to send light (IR) to and from the
>>> object, so it is immune from surface reflectivity issues, and also immune
>>> from many of the problems with ultrasonic sensors.
>>>
>>> The only drawback that I see is the relatively short range - 0.5 meters is
>>> listed in the spec sheet, but if you look at the app note they are
>>> measuring distance out to almost 2 meters. The actual distance is
>>> dependent upon ambient light and surface reflection. Note that while the
>>> maximum dept allowed is dependent upon surface reflection, the actual value
>>> of the measurement does not.
>>>
>>> I will be ordering one of these soon (too bad I did not know about it
>>> before placing two orders to them just last week).
>>>
>>> Take a look at both the datasheet and the appnote.
>>>
>>>
>>> __._,_.___
>>> ------------------------------
>>> Posted by: Rodney Radford <ncgadgetry at gmail.com <mailto:ncgadgetry at gmail.com>>
>>> ------------------------------
>>> Reply via web post
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>> ------------------------------
>>
>> Message: 2
>> Date: Fri, 13 Feb 2015 13:36:12 -0500
>> From: Rodney Radford <ncgadgetry at gmail.com <mailto:ncgadgetry at gmail.com>>
>> To: trianglerobotics <trianglerobotics at yahoogroups.com <mailto:trianglerobotics at yahoogroups.com>>
>> Cc: TriEmbed Discussion <triembed at triembed.org <mailto:triembed at triembed.org>>
>> Subject: Re: [TriEmbed] [TAR] New TOF (time of flight) distance sensor
>> from Sparkfun
>> Message-ID:
>> <CA+kfaxGLmRAXTDRA200NyiuoV5hDLinY2J_Ng=M5N-q9TNZAew at mail.gmail.com <mailto:M5N-q9TNZAew at mail.gmail.com>>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Yet an additional followup - while reading the comments on the bare sensor,
>> someone mentioned the ST eval board and it is $19.95 and includes an
>> arm-cortex-4 processor and USB interface:
>>
>> http://www.mouser.com/ProductDetail/STMicroelectronics/EVALKIT-VL6180X/?qs=sGAEpiMZZMvfpQN6QVmrfGjb%252b49cDybCa83Lgq8kEXU%3d <http://www.mouser.com/ProductDetail/STMicroelectronics/EVALKIT-VL6180X/?qs=sGAEpiMZZMvfpQN6QVmrfGjb%252b49cDybCa83Lgq8kEXU%3d>
>>
>>
>> On Fri, Feb 13, 2015 at 1:21 PM, Randy Farmer randy.farmer at gmail.com <mailto:randy.farmer at gmail.com>
>> [trianglerobotics] <trianglerobotics at yahoogroups.com <mailto:trianglerobotics at yahoogroups.com>> wrote:
>>
>>>
>>>
>>> Cheaper breakout with just the sensor:
>>>
>>> https://www.sparkfun.com/products/12784 <https://www.sparkfun.com/products/12784>
>>>
>>>
>>> On Fri, Feb 13, 2015 at 1:14 PM, Rodney Radford ncgadgetry at gmail.com <mailto:ncgadgetry at gmail.com>
>>> [trianglerobotics] <trianglerobotics at yahoogroups.com <mailto:trianglerobotics at yahoogroups.com>> wrote:
>>>
>>>>
>>>>
>>>> If you are on the Sparkfun mail list, you probably already got this, but
>>>> this guy is interesting enough to warrant an announcement just in case.
>>>>
>>>> https://www.sparkfun.com/products/12785 <https://www.sparkfun.com/products/12785>
>>>>
>>>> It is a $24.95 TOF (time of flight) distance sensor - this means that it
>>>> actually measures the amount of time to send light (IR) to and from the
>>>> object, so it is immune from surface reflectivity issues, and also immune
>>>> from many of the problems with ultrasonic sensors.
>>>>
>>>> The only drawback that I see is the relatively short range - 0.5 meters
>>>> is listed in the spec sheet, but if you look at the app note they are
>>>> measuring distance out to almost 2 meters. The actual distance is
>>>> dependent upon ambient light and surface reflection. Note that while the
>>>> maximum dept allowed is dependent upon surface reflection, the actual value
>>>> of the measurement does not.
>>>>
>>>> I will be ordering one of these soon (too bad I did not know about it
>>>> before placing two orders to them just last week).
>>>>
>>>> Take a look at both the datasheet and the appnote.
>>>>
>>>>
>>>>
>>> __._,_.___
>>> ------------------------------
>>> Posted by: Randy Farmer <randy.farmer at gmail.com <mailto:randy.farmer at gmail.com>>
>>> ------------------------------
>>> Reply via web post
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