I apologize that I’ve been quite busy recently and haven’t had time to post to the blog. But there have been a number of interesting projects developing since my last post. I’ll try to catch up over the next week on some of the projects. I’ll start off with a fairly major construction project that…
Very successful first peer-to-peer protocol test
I’ve coded up a simple test of the peer-to-peer protocol I’ve been discussing recently. Here is a picture of the set-up: For this test, I have 3 light posts transmitting short 10byte packets as fast as they possibly can given the constraints of the protocol. These constraints basically reduce to: You can’t send a packet…
Please stop interrupting me (more analysis of AVR interrupts)
I have recently been working on designing a peer-to-peer RS485 network protocol with collision avoidance (and maybe even collision detection) for the walkway lights on the land. (Link to last two posts: here and here.) As mentioned in my last post, even though each device is doing its best to detect if another device is…
Building a simple but efficient peer-to-peer RS485 network protocol
In my last post, I mentioned that I am working on a peer-to-peer network protocol for the RS485 network that I am using to communicate between my “smart walkway lights”. In today’s post, I will continue with a general outline of the approach I plan to take. This is all very nerdy, so if you…
Walkway lights, network protocols, masters, and slaves
It has been a bit quieter than usual on this blog recently. It isn’t that we haven’t been up to much. Quite the contrary, it has been very busy. But much of the business (busy-ness) has been either at work. And the land work has mostly just been putting finishing touches on projects that have…
SlingBot prototype moving
This is a picture of the motorized SlingBot prototype with battery, microcontroller, and L298 based motor driver circuit installed. It seems to go about 75cm per second which is about 3/4 of my target of 1 meter per second, but this is plenty good enough for this prototype. We might be able to speed it…
SlingBot Update: Prototype up on the test cable
Today, we assembled the prototype SlingBot with motor and wheels. Don’t mind the bright red wheel, we are just trying to use up some free PLA that came with a printer on some of these prototype prints. It isn’t some new design sense I have. This new design seems to sit well on the sling…
SlingBot Update: Basic parts printed
Ran prints all day yesterday and overnight, too. 3D printing is now done for the main pieces of the SlingBot prototype. In the picture, you can see two wheel struts and the main center motor and wheel mount piece. Each of the 3 pieces took 3-7 hours to print. (Yes, 3D printing on my machine…
New Project: SlingBot
I just started a new robot project. The goal is to build a 3D printed robot that can mount an IP camera, has pan and tilt functionality, and a drive motor that drives the robot along a sling cable. It will probably be battery powered with an inductive charging connection. Ideally, I can control it…
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