Planet Arduino

Riley, an 8 lb pug, has more beauty than brains, and a palate as unrefined as crude oil. While we hate criticizing others’ interests and tastes, his penchant for eating cat poop needed to stop. After a thorough exploration of a variety of options, including cat food additives that make its excrement taste worse (HOW? WHY? Clearly taste wasn’t the issue!), automatic litter boxes that stow the secretions, and pet doors that authenticate access to the room with the litter box, [Science Buddies] eventually settled on a solution that was amenable to all members of the family.

The trick was in creating a door mechanism with a blacklist of sorts rather than a whitelist. As the cat didn’t like to push the door open itself, the solution needed to have the pet door open by default. A magnet on Riley’s collar would trip a sensor attached to an Arduino that would control servos to swing the door shut immediately if he attempted to access the defecated delights. Of course safety was a consideration with the door swinging in Riley’s face.

We’ve covered a few pet screeners, including one for the same purpose that used IR sensors (but a much bigger dog also named Riley), and a flock of solutions for chickens. We’ve also seen [Science Buddies] in previous posts, so they’re not on the tips line blacklist.

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Fun build from maker Markus Opitzk! The end result is both functional and friendly; a less-stress approach to timekeeping.

To be honest: If you’re not working, you don’t really need an exact time: it’s about afternoon, I’m hungry, I’m tired, it’s time to go to bed. And in the morning, the alarm clock on my mobile phone wakes me up again.

In the meantime, an hourglass would be enough to show the passage of time. Unfortunately, the large hour glasses are hardly available any more.. Only small ones for the kitchen that show maybe 3 or 5 minutes.

That’s why I built an hourglass that takes exactly one hour to run through. The hour time is still displayed as a number in the top glass.

See the full project details here on Instructables.

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Hello, the device I am going to review is the MaUWB_DW3000 with STM32 AT Command. This is an Ultra-wideband (UWB) module from MakerFabs. The core UWB module on this board is the DW3000 UWB transceiver, and it is also equipped with an ESP32 microcontroller programmable with the Arduino IDE, as well as OLED display. The manufacturer claims that this UWB board resolves multiple anchors and tags mutual conflicts and supports up to 8 anchors and 64 tags. Additionally, the manufacturer has added an STM32 microcontroller to handle UWB multiplexing, allowing users to control the core UWB module by simply sending AT commands from an ESP32 microcontroller to the STM32 microcontroller. More information about this UWB board can be found on the manufacturer’s website. “MaUWB_DW3000 with STM32 AT Command” unboxing MakerFabs sent the package to me from China. Inside the package, there were 4 sets of the MaUWB_DW3000 with STM32 AT [...]

The post “MaUWB_DW3000 with STM32 AT Command” Review – Using Arduino to test UWB range, precision, indoor positioning appeared first on CNX Software - Embedded Systems News.

Every maker should have a bench power supply in their possession, ready to provide whatever voltage a project or particular component requires. But not all bench power supplies are created equal. Some only have a single output, some have a limited voltage range, and some can’t handle much current. In an attempt to eliminate such concerns forever, Doug Domke built “the Beast.”

This is a beefy bench power supply that can easily handle any project an electronics tinkerer is likely to tackle. It has three outputs that can all operate at the same time. Two of them can be set anywhere from 2V to 30V and can supply up to 10A each, at 30V. However, the supply transformer is only rated for 240 watts. If both are pulling the full current, then setting them above 24V would exceed the rating. But that isn’t a situation many people will find themselves in. The third output comes from a 20W supply that can provide 3V to 30V (positive or negative).

The user sets each output’s voltage with a simple potentiometer, but an Arduino Nano monitors the voltage and current of each using the analog input pins. The maximum 30V is far too high for the Arduino to work with directly, so it takes measurements through voltage dividers. With voltage and current readings, the Arduino can then calculate wattage. It displays the information for each output on a dedicated 16×2 character LCD screen, connected via I2C. 

If you’re in need of a robust bench power supply, the Beast may just fit the bill.

The post This beastly DIY bench power supply will satisfy any requirement appeared first on Arduino Blog.