3D Print a House Key from a Photo

This is a video I did back in 2017 where I took a photo of a house key and 3D printed it and it actually worked. NOTE: This key wasn’t the strongest of keys. And only worked a few times. But it is only needed once to make it a bad day for a home owner. Beware when you post pictures that include your keys in them.

Access Catalina’s API for Dynamics SL using .NET Core

If you are looking to build a cross platform application in .NET Core that can access Dynamics SL, you can use Catalina’s API for Dynamics SL. This is a demo on how you can do it using Visual Studio and deploy the client to Windows, Mac, and/or Linux (or any OS that supports .NET Core).

Demo on Connecting to Dynamics SL through .NET Core

You can get the source code for this demo on our GitHub site: https://github.com/CatalinaTechnology/dotNETCore/MyConsoleApp

Create Projects with Catalina’s API for SL – SOAP Web Services

Last week, I posted a video for a demo on how to use our REST API to integrate to projects in Dynamics SL. This one uses our SOAP based Web Services to do the same thing.

Sample code can be acquired from our GitHub repository:

You can clone or download all sample projects here from github:

http:// https://github.com/CatalinaTechnology/ctAPIClientExamples

Retrieve Catalina Queue FIFO

If you use the Catalina Queue Engine for queuing records, you might want to retrieve data in a FIFO (First In First Out) method. This means you want to grab the oldest records first. This is easily accomplished by calling the Catalina Queue API with the parameter sortBy in the query string.

Example, if you are retrieving the queue ORDERS, you would format your URL, for the Queue API, like this:


This will then sort the queue in Ascending order by createdDate. Which means it will retrieve oldest items first.

Below is a curl example that does the same thing.

curl -X GET \
'http://YourServer/ctDynamicsSL/api/queue/QUEUETYPE?sortBy=createdDate' \
-H 'Accept: application/json' \
-H 'Authorization: Basic YOURAUTHHERE' \
-H 'Cache-Control: no-cache' \
-H 'Content-Type: application/json' \
-H 'cache-control: no-cache'

Minimum SQL Security Requirements for Catalina API


If you are going to use our userMaintenance web service, to manage SL user logins, it will also need:

Also note that by default, we normally install our scripts under the dbo schema. So, you also have to give the user, we are connecting as, execute on that schema.

eg. grant  execute on schema :: [dbo] to usernamehere

PH and Temperature Hydroponic Monitor using MQTT

There have been quite a few requests for the code for my MQTT posting IOT project for testing PH and Temperature of my hydroponic towers. This code is several years old and I haven’t looked at it for at least 2. But, I figured I would put it out on GitHub.

The main purpose of this code is to monitor the PH and temperature in a water tank for my hydroponics and then use MQTT to post to io.adafruit for a dashboard.