A tool to search new listed items on ebay

[snaker]

I am searching a good used chair to use as a barebone (frame?) for my 48v powerchair project. I hate to have to access ebay everyday for searching. So I write a simple tool that does this searching job automatically. I set it run at a specific time (e.g at 6AM everyday). So if there are new listed items on ebay, the tool will automatically notify me through email. E.g I receive an email as underneath when looking for a "roho cushion QS910C".

This tool can be compiled and deployed to all platforms even MAC. Actually I tested it Ok on windows, linux-amd64, linux-armv7 (orange pi, raspberry pi). It should be used in a low energy machine that runs 24/7. I recommend using orange pi or raspberry pi. If anyone is interested, I will upload it later.

If you see a good used RWD chair at a sensible price by chance, please let me know. I only need a basic chair with sturdy frame, suspension. I will not use power options like lift, powered recline, powered tilt etc

[shirley_hkg]

Look for a QUICKIE 6X6 series .

The most sensible placement of the shock absorber, between drive axle and pivot .

[slomobile]

I'm interested in both the ebay search tool and the 48v chair.

Ebay search using a compiled language? Interesting.

48v, what would you like to use for motors and controller?
I'm curious what mode typical 24v motors fail in when used at 48v and how much sooner they fail. That cumulative failure info is hard to gather by a single person with a single setup. So anyone doing higher voltage setups ought to share their experience. Thanks for sharing.

[Burgerman]

I an tell that from a physics standpoint the rpm should make little difference as long as nothing flys apart. Easy to test.

But if you dont control the watts going in, then you will have a problem. Because twice the volts means 4x the watts. Doubling the volts me and double the current. Thats just mr Ohm and his law. So in simple terms with simple numbers thats 4A x 4V = 16 Watts. but 8A x 8V =64 watts.

Now how that relates to a powerchair is not so simple. Because while the motors can take the RPM at least mine were OK at 60V and run at 45V, they cant take 4x the watts. But they dont have to. Because while a typical powerchair motor has a stall current of maybe 300 plus amps, its limited by the max amps of the controller when its loaded up by acceleration or load. So at stall it has the same 100A limit (for e.g) regardless of the battery voltage or battery current. This is done by reducing the motors pulsewidth or if you prefer voltage. At stall it may be limited to an effective 5 volts for e.g. Regardless of battery voltage.

The danger comes as you speed up. Now even if going at say 8mph, (24V - pulsewidth) - flat out on a 24V chair. My 45V chair can still apply another 21V... So it can still draw way above the maximum ams the controller can provide. So it will wheelie and accelerate very hard and spit you out of the back, or accellerate up a steep hill at speed. THIS is where you overload the motor, too many watts over a long time. And burn its armature or brushes and destroy it. You cant realistically do that with 24V.

Doubling the voltage has a similar affect to halving the impedance. If you understand this, then ts easy to run on 45V safely. If nt and you fly up a hill faster than you would in a 24V chair, then you will fry the motors. Larger wattage motors would be required if you ignore this. Watts doesent determine motor power. Impedance does. It determines the approx AVERAGE heat loss capability before demise.

[ex-Gooserider]

Assuming the tool allows you to put in different items, I'd also be interested.... I've tried using the eBay tools a few times and found them annoying in that they got way to many hits on stuff I wasn't looking for, and kept showing me the same listings over and over....

Snaker's tool sounds like it is worth a try to see if it does a better job.

ex-Gooserider

[snaker]

I uploaded the tool on google drive by the link below
https://drive.google.com/drive/folders/ ... share_link

There are 2 folders "bin" and "config":
- The bin folder contains the executable apps for each platform. Actually it supports win-x64, linux-amd64, linux-armv7.
- The config folder contains 2 template file query.json, mailing.json that will be used for searching and sending notification mail.

To use the tool you put the executable and config files in a folder as below. When running it will create a data folder to track notified items. At the first run, it will send you ALL found items. Then at next runs, it will only send new listed items. If there is no listed item, it will not send notification email.
your-folder
|__config
| |__mailing.json
| |__query.json
|__itemcrawler

I explain a bit about mailing.json and query.json.

The mailing.json is like below. It's used to send notification email. If you use a free gmail account as sender you have to create an App Password and use it in place of login password. Because since June 1rst 2022, gmail does not allow using login password to send mail. If you use other email service as sender, you will have to change smtp and port accordingly.

Code: Select all

{
   "Subject": "Powerchair build",
   "Sender": {
      "UserName": "yoursendingemail@gmail.com",
      "Password": "p@ssw0rd",
      "Smtp": "smtp.gmail.com",
      "Port": 587
   },
   "Recipients": [
      "youremail1@gmail.com",
      "youremail2@gmail.com"
   ]
}


The query.json is like below. it supports multiple queries. The url is copied from ebay. The ebay search result is not very accurate, e.g I search "Quickie power wheelchair", the result might contains items that are not related to powerchair. So "Keywords" and "Patterns" will be used to filter the search result. Normally, you only need "Keywords". "Patterns" are RegEx patterns and serve for 'advanced' use.

Code: Select all

[
   {
      "Title": "A TITLE OF YOUR SEARCHING",
      "Url": "SEARCH URL COPIED FROM EBAY",
      "Keywords": [
         "WORDS MUST BE INCLUDED IN THE ITEM TITLE"
      ],
      "Patterns": [
         "REGEX PATTERN FOR ADVANCED USE"
      ]
   },
   {
      "Title": "A TITLE OF YOUR SEARCHING",
      "Url": "SEARCH URL COPIED FROM EBAY",
      "Keywords": [
         "WORDS MUST BE INCLUDED IN THE ITEM TITLE"
      ],
      "Patterns": [
         "REGEX PATTERN FOR ADVANCED USE"
      ]
   }]


You can refer config files in the test below for more details.
https://drive.google.com/file/d/1euDhef ... share_link

[shirley_hkg]

If you see a good used RWD chair at a sensible price by chance, please let me know.
Seller ships worldwide .

https://www.ebay.com/itm/275082184047?m ... media=COPY

[snaker]

I saw this chair through the tool too. But I only need a basic chair without power options at a cheaper price.

[snaker]

Here is the screenshot when I run the tool to search powerchairs.

And here is the screenshot of the notification email.

[shirley_hkg]

If you see a good used RWD chair at a sensible price by chance, please let me know.
Seller may not ship worldwide .

https://www.ebay.com/itm/165924527894?m ... media=COPY

[snaker]

This chair is a good candidate

[wheelchairer]

I am searching a good used chair to use as a barebone (frame?) for my 48v powerchair project. I hate to have to access ebay everyday for searching. So I write a simple tool that does this searching job automatically. I set it run at a specific time (e.g at 6AM everyday). So if there are new listed items on ebay, the tool will automatically notify me through email. E.g I receive an email as underneath when looking for a "roho cushion QS910C".

This tool can be compiled and deployed to all platforms even MAC. Actually I tested it Ok on windows, linux-amd64, linux-armv7 (orange pi, raspberry pi). It should be used in a low energy machine that runs 24/7. I recommend using orange pi or raspberry pi. If anyone is interested, I will upload it later.

If you see a good used RWD chair at a sensible price by chance, please let me know. I only need a basic chair with sturdy frame, suspension. I will not use power options like lift, powered recline, powered tilt etc

I have set up the files as best I could to the description given, but when I execute the executable file my Gmail account does not receive the email. Any suggestions?

[snaker]

For an outlook email address as a sender:
Smtp = "smtp-mail.outlook.com"
Port = 587

Gmail usually pushes emails sent from outlook into Spam. So check Spam if you do not see emails in Inbox. Then mark them "not spam", next time they will arrive in Inbox.

[wheelchairer]

So I change the things as you said
I've even changet the email account password just to double check
and when I check the sent folder in my mail program, nothing has been sent to the Gmail account.

Changed nothing in the query file

[snaker]

Can you post the screenshot after you run the tool (something like the image underneath).

Can you let me know which OS (linux-armv7, linux-amd64, windows-x64) are you running the the tool? I will create and send you the full app and config files.

[wheelchairer]

Can you post the screenshot after you run the tool (something like the image underneath).

Can you let me know which OS (linux-armv7, linux-amd64, windows-x64) are you running the the tool? I will create and send you the full app and config files.

I can tell you now it fails at "fetching items" so it looks like there is something wrong with the query,

Windows 10 64-bit

[snaker]

Yes, you have to remove the regex pattern from the query.json.

Download, unzip the attached file and replace your query.json by the new one.

Code: Select all

[
  {
    "Title": "M8 Countersunk Bolts (UK Ebay)",
    "Url": "https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=m8+countersunk+bolts&_sacat=0",
    "Keywords": ["m8 countersunk bolts"]
  }
]


[wheelchairer]

It gets stuck here now

[snaker]

It seems there is something wrong in your mailing.json file.

I tried to register a free outlook account (wheelchairer@outlook.com) and I see the tool works fine with this account (see attached images underneath).

Download and unzip the attached config.zip.
Replace your config files by the new ones (the query.json in my previous post used the wrong ebay url).
Replace the text "YOUREMAILADDRESS" in mailing.json by your real email address.
Run the tool, it should work fine.
If you do not see the email in your Inbox. Check the Spam folder, you will see it there. Mark it as "not spam", next time it will arrive in your Inbox.

Code: Select all

{
   "Subject": "M8 Countersunk Bolts",
   "Sender": {
      "UserName": "wheelchairer@outlook.com",
      "Password": "Wc123456$",
      "Smtp": "smtp-mail.outlook.com",
      "Port": 587
   },
   "Recipients": [
      "YOUREMAILADDRESS"
   ]
}


[snaker]

[shirley_hkg]

I like these motors.

[Burgerman]

Those should be more efficient (slightly due to inline layout) and so if low impedance would probably be good motors.