When you walk through the garden section of your home store in the summer you will see a bunch of misters spraying the plants every now and then to keep them moist. Johnny Klaus has built a system that will mist his plants using an Arduino that is pumping a spray bottle using a 12 volt door lock motor. I think this system could also be used to keep
Got some old corded phones kicking around from the days before 3 and 4 handset cordless system took over? Why not make them useful again by making an intercom from the. Growing up I remember seeing all of the 2 and 3 station intercom system in the Radio Shack magazines, I always wanted a system in our house no matter how impracticable it would have been. In about 1/2
 Ok, it isn’t actually not a Long Nose Robot of Death even if that is what it looks like… 🙂 It’s a Raspberry Pi controlled Tank that can shoot BBs. This tank was mostly 3D printed and uses a Raspberry Pi since the original idea of using an Arduino was shot down due to lack of processing power. “What features I want this tank to have? Remote controlled
Over at The Signal Path Blog Shahriar Shahramian has a look at a Fluke 196B Handheld ScopeMeter that he purchased from an eBay seller. The meter was purchased for a few hundred dollars and was listed with a fault that is doesn’t power up. It didn’t come with probes, a back cover or the battery. Shahriar was ready for a full tear down and hopefully a repair but as
Instead of keeping a dozen sizes of power resistors on hand to test your variety of power supplies an electronic load allows you to dial in the exact load you are looking for. This DIY 4 Channel Electronic Load that gelbanana built allows you to connect a bunch of different items to load test at once. The cabinet is recycled and a custom cut piece of clear acrylic is used
Michael Beyhs has a new site called Electrical Engineering and More, his first project shows us how to Use an LED as a Sensor. LEDs are normally used to produce light but like many other electrical items it works a bit in the other direction, meaning that it will produce a small voltage when you shine light into it. “How the code works: Configure all analog inputs to outputs
 There are a number of great older bench meters out there that would be perfect when upgrading from a hand held meter when working on the bench. The HP 3468A meter can be had for under $200 in good working condition and often around $100 for a unit that powers on but no operation confirmed. Modemhead purchased one that was DOA, have a look at the pictures he
