![]() You'd be wanting (i'm assuming) some motor/servo that's connected to your board. What you're sending is generally depending on what you want to control. Or another example, dial-up modem, it's pc-modem-pc. You're sending (in this case being a projector) an RS232 signal through the board to the projector. It's sitting in the middle of the computer/projector. Think of it like a control panel for a projector. However, what, exactly, you read and write confuses me - unless there's an Ardunio that comes pre-programmed with a handy API that I can simply send and receive data from input / output ports with, I assume I have to write my own code for the Ardunio, upload it to the Ardunio board and then communicate via USB/serial to get / set input / output values?Think it depends what you're trying to do. I've found some documentation that says communicating with the Ardunio via USB/serial is really easy - you just read and write data via an appropriate /dev/. I'm just reading about the Ardunio again - I've been semi-tempted to buy one to tinker with for a while, and now I'm getting even closer to actually buying one. I have tested the first method not the 2nd (although will be soon!) Or create something using the Arduino - HomePage Chips which can do the same thing What's the bst way to do the computer-controlled lock part of things? Is there a simple USB-based interface available that I can control easily from a Python script or similar?Look at what I have used for the Network Kettle - you could use a Web relay (although around $130) which can control up to 4 doors and then just have a web form which once submitted is checked against AD or similar (ldap) which once authenticated you could then run the script to open a solenoid. Staff will have to enter their username and password to open an individual door to get a laptop out. I'm aiming for a cabinet with six individual slots, each with a power cable for charging the laptop and secured by a door locked with a computer-controlled lock. We are going to put half a dozen laptops in our staffroom, in some kind of secure cabinet.
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