It's perfectly fine soldering with single core wire provided you are careful to ensure that it is properly tined and use plenty of flux. More heat is generally required which is a disadvantage as well as not acting well under strain, the joint cn be brittle but not if you leave it alone. There are clear disadvantages to using this wire i agree but its not like its taboo or anything. Simple wire antennas and coax are often soldered and these are also solid core its not preferred but it does have its uses and is often soldered. In saying that if you're worried about bad connections you shouldn't be using breadboard in the first place. Debugging bad rails is way more annoying than finding a bad solder joint.

Just use perf board from the get-go and leave your wires ling enough that they're easily resolderable. Breadboards are prone to broken connections. When I HAD to use them for particular projects in university, it took longer debugging crappy connections than it would have to just solder it. Rails become loose after minimal use, especially with multiple components or wires plugged into the same row. I can't disagree with you more. breadboards, especially in industry, are a complete waste of time. So much so that my boss has literally banned them from use in prototyping our designs.

Or just don't use breadboards and solder the circuit to perf board or strip board from the get-go. By the time you've planned, placed and neatly sized your wires, you could have just build it on perf board. Yes placement is more permanent unless you're using sockets. Seriously though, soldering each connection doesn't take longer than a few seconds. If I make a mistake, wick and move the connection, again only takes a few seconds I don't understand why people still use these things, they aren't reliable enough IMO

@@jackmarshall2496 in my opinion, bread boards are good for beginners and quick/temporary circuits. Of course a soldered connection is the best connection but the breadboard helps get the jist of a circuit (among other things). For example, you could be making a circuit where you need to swap out components quickly such as a 555 timer circuit, it would be much easier to pull out and put in resistors than desoldering and soldering.

That is a Particle Photon. Particle do a large range of MCUs which IMO are very underrated. They are pretty much like an 8266 but they use ARM processors. I started out on those, but have begun using 8266 boards for grunt work cos of their cheapness. But Particle boards -although more expensive come with all kinds of stuff built in that you have to add on to 8266s. For example there's an internet based secure messaging system which works out of the box - plus a number of other goodies like OTA programming without any add-ons. Well worth a look.

Sure but it will be less reliable as the electrical connections are all mechanical. Also it will be more prone to noise and interference. This is why moving to a perforated breadboard and soldering components is preferred for prototypes. After a prototype, to go into production a real pcb is usually desired for simplicity, reliability, less noise and ease of assembly.

​@@HoptronicsI don't know if that's correct single core wire is used in transmission lines as opposed to multicore. Its also preferred for use in wire antennas, even pcb traces are effectively single core. The major disadvantage is brittle connections that don't stand up to strain well, if a wire can be moved its best to make it multicore but its fine if its inside a case and never touched.