The project didn’t start with the noble aim of realizing the hidden and underutilized quiescent nature of a smoke alarm, though. He wanted his range exhaust fan to turn on automatically when it was needed during his (and his family’s) cooking activities. The particular range has four speeds so he wired up four relays to each of the switches in the range and programmed a Particle Photon to turn them on based on readings from an MQ-2 gas-detecting sensor.
The sensor didn’t work as well as he had hoped. It was overly sensitive to some gasses like LPG which would turn the range on full blast any time he used his cooking spray. Meanwhile, it would drift and not work properly during normal cooking. He tried disabling it and using only a temperature sensor, which didn’t work well either. Finally, he got the idea to tear apart a smoke detector and use its sensor’s analog output to inform the microcontroller of the current need for an exhaust fan. Now that that’s done, [Ben] might want to add some additional safety features to his stovetop too.
Gas cooktops have several benefits, being able to deliver heat near-instantly, while also being highly responsive when changing temperature. However, there are risks involved with both open flames and the potential of leaving the gas on with the burner unlit. After a couple of close calls, [Bob] developed a simple solution to this safety issue.
Most commercial products in this space work by detecting the heat from the cooktop, however this does not help in the case of an unlit burner being left on. [Bob]’s solution was to develop a small round PCB that sits behind the oven knobs. Magnets are placed on the knobs, which hold a reed switch open when the knob is in the off position. When the knob is turned on, the reed switch closes, powering a small microcontroller which beeps at regular intervals to indicate the burner is on.
It’s a tidy solution to a common problem, which could help many people – especially the elderly or the forgetful. It integrates neatly into existing cooktops without requiring major modification, and [Bob] has made the plans available if you wish to roll your own.
If you search the web, you will learn that humans began to cook their food with fire a long time ago. Indeed, you might expect that there would be nothing new in the world of flame-based cookery. Fortunately [Bongodrummer] didn’t get that particular memo, because he’s created a rather unusual rocket stove griddle that is capable of cooking a significant quantity of food.
A rocket stove is designed to achieve as efficient use of energy as possible by achieving the most complete burn of high surface area fuel. It features a small combustion area and a chimney with supplementary air feed to ensure that exhaust gasses also burn. This one feeds all those hot gasses directly to the griddle, before taking them away up a pair of flues. As an added bonus there is a dome attachment for a pizza oven, made when a previous project had some left-over building material. Take a look at the comprehensive build video below the break.
Perhaps alarmingly the combustion chamber and chimney are made from a gas cylinder, but the use of a central heating radiator for the griddle is an extremely good idea. A vortex air inlet at the bottom and a secondary air injector further up the chimney complete the unit, making for a worthy replacement for a traditional barbecue.
If you love a good stir-fry, you know that it can be a challenge to make on your stove at home. Engineer gourmet and Youtuber [Alex French Guy Cooking], in collaboration with [Make:], whipped up a portable range capable of making delectable stir-fry.
There are three major problems when it comes to cooking stir-fry: woks are typically unstable on normal burners, those burners don’t tend to heat from a center point out, and they usually aren’t hot enough. [Alex]’s 12,000BTU portable stove is great for regular applications, but doesn’t cut it when it comes to making an authentic stir-fry.
To focus the burner’s heat, he cut and bent a stainless steel baking ring into the shape of an exhaust nozzle — not unlike a jet engine — and lightly modified the range to accommodate the nozzle. He also added a larger baking ring with air flow holes for the wok to rest on. Two down, but there’s the issue of it not being hot enough.
So, why not use two butane canisters to double the output to 22,200 BTUs!
Camping and road trips are a heck of a lot of fun, despite lacking many of the creature comforts that come from a house and its amenities. We’re all for fire-cooked meals, but sometimes, you want a cook-top and a sink to make cooking on the go a quick process. What if you could pack up a kitchen into a box and take it with you?
[pointblankjustice] — opting for overkill — built this for his girlfriend instead of the requested box to simply store camping supplies. Glued and screwed plywood forms the frame, drawers, and lid which was then stained and painted to make for an appealing finish. A simple propane camp stove makes a worthy cook-top.
Obviously, one must include a kitchen sink, so a small bar sink and hose faucet are kept running with a cheap, 12V, 35psi pressure pump from Amazon. A little doughnut magnet keeps the faucet secured when not in use. Spent grey-water drains from a hose into a bucket or into a ditch (don’t worry — [pointblankjustice] uses biodegradable soap!).
As an added bonus, [pointblankjustice] has some under-cabinet lighting and accent lighting to keep things cooking late into the night, with power supplied by an extension cord going to their Jeep’s cigarette lighter outlet — plans to add a built-in battery are pending. There’s also a pair of USB ports to keep one’s phone charged and a bear-shaped bottle opener to keep the good times rolling!
The kit packs up nicely and fits snug in the rear of [pointblankjustice]’s Jeep with enough room for other supplies and a pair of dogs.
For longer hauls out into the wilderness, you might consider bringing a solar power supply unit that literally lasts for days.
Homemade stoves are a very popular hack, you can find a zillion videos on YouTube, mostly on alcohol stoves, and they work great. Less common are butane fueled stoves, but [Thomas Kim] has uploaded a video on a super easy and cheap butane stove.
Like many other DIY stoves, the body is a soda aluminum can. After sealing the top side with aluminum foil, you just need to drill some holes in it. Other necessary components are a metal tube and a syringe needle that acts as flow regulator. [Thomas Kim] makes an interesting fixture that is attached to the can and lets you control the pressure on the can valve and adjust the flame of the stove via a couple of screws.
The stove works great. It is a nice and simple project if you want to start experimenting with these stoves. Safety is important of course, working ventilated area and protect the butane source from heat (in this case the feed tube keeps it away from the burner). Some other projects you may find interesting are this easy rocket stove, or even this project to make your own briquettes from waste materials. Enjoy and stay safe.
Home-built foundries are a popular project, and with good reason. Being able to melt and cast metal is a powerful tool, even if it’s “only” aluminum. But the standard fossil-fuel fired foundries that most people build are not without their problems, which is where this quick and clean single-use foundry comes into play.
The typical home foundry for aluminum is basically a refractory container of some kind that can take the heat of a forced-air charcoal or coal fire. But as [Turbo Conquering Mega Eagle] points out, such fuels can lead to carbon contamination of the molten aluminum and imperfections when the metal is cast. With a junked electric range, [Turbo Conquering Mega Eagle] fabricates a foundry that avoids the issue in an incredibly dangerous way. The oven’s heating element is wrapped around an old stainless saucepan, fiberglass bats from the stove insulate the ad hoc crucible, and the range’s power cord is attached directly to the heating element. The video below shows that it does indeed melt aluminum, which is used to sand cast a fairly intricate part.