remipch

There is "MESSAGE IN A BOTTLE.txt".

The first game here is to understand what the code does without a high-level README.

Thank you for sharing, I'm just starting to dig into Lua language and Love2D game engine.

I will explore your game source too.

Unfortunately, I don't remember them anymore and I regularly clear my browser cache.

Maybe it's just the case you're describing but I'm pretty sure I was really looking for appropriate sources and they weren't provided.

If you want, I can send you my queries if I see this again.

As an occasional user, what I really liked in your previous version was that Phind always gave the list of sources.

So my workflow was :

- ask a question

- quickly read the given answer

- go to the main sources to decide if they are trustworthy or not

I noticed that the new version does not always give the sources, even when I ask. Is this intentional or do you plan to revert this in the near future ?

It also solves the problem of not reducing the traffic to the content creators you use.

Anyway, congratulations for making this tool and offering a free plan to test it.

Hi HN!

I just discovered Josh Newans' projects and tutorials about mobile robotics on ROS2.

I find them particularly clear and straightforward, and I think some HN people here might find them interesting as well.

It can be great for beginners to explore the project, but as a robotics engineer myself, I also find some specific topics really useful and well explained. The ROS2 documentation is not always as clear as it could be.

Hope you enjoy!

What do you mean by "better"? There are several aspects to consider.

Indeed the advantage of your photovoltaic solution is versatility in the face of clouds and lower mechanical costs.

But the drawback is the larger panel area, higher panel cost and probably shorter panel lifetime.

Photovoltaic efficiency is about 20%, while even low-cost mirrors reflect 90% of the energy.

It really depends on the specific application and the answer does not seem so obvious to me.

> not sure where you are based in France

I answered your question too quickly, I'm near Clermont-Ferrand, we have several local brewery here.

Thanks for your kind and detailed reply.

> it occurs to me that your system only requires an occasional movement rather than a rapid movement for tracking purposes

Right, actually the system wakes up every 10 seconds to check if the angle needs to be adjusted. It often does not and waits for the next 10 seconds.

There is an opportunity to implement true "hibernation" while the system is waiting to save some more power, but it's not done yet.

> Secondly, the motion system appears to be single-ended and based upon a rope and a stepper motor. It would perhaps be useful to consider conversion to a more rigid system.

Actually there are two geared motors, allowing to control both angles.

Yes, I use simple ropes, the system is stable enough thanks to the counterweight (all ropes are always under tension, making the whole system stable).

> In short, if you have knowledge of your own geometry, have known orientation relative that fixed point, and can before activation determine the TOF distance to your target, and have a GPS fix thus solar inclination at that moment is calculable, then it should be possible to track the target without the need for visual feedback.

My project takes the opposite approach: using a low-cost camera board to avoid having to measure all the geometric aspects precisely.

> In terms of temperature sensing, you can obtain remote temperatures using infra-red linear systems which should be effective.

Good idea, I haven't implemented temperature sensing yet, but I'll look into infrared sensors.

> In terms of safety, laser TOF ensuring no change in distance would ensure the subject is still within the programmed range and an intermediate object hasn't been introduced for combustion.

It may be too late, the intermediate object/person is already heating up by the time we detect it.

> In terms of gathering interest, not sure where you are based in France but I could suggest structuring the system as a public sculpture and holding events including eating food cooked by the system which could involve the additional sponsorship of local wineries, cider, etc. to garner social support.

Yes I'm in France, it would be nice to present the system at such events. For the moment I'd much rather get to work on the technical side.

> Smiles from Sydney. I applaud your work toward the application of technology to social and environmental concern, we need more of this.

Thank you

Yes I've seen a solar dish warmer with a satellite dish (manually adjusted).

It was clever.

With the low-cost camera used here, the small red/green/blue pattern would be indistinguishable because the whole spot is saturated.

It might be possible with an expensive camera.