We’re suckers for alternative data transmission methods, and [Georgi Gerganov]’s ggwave made us smile. At its core, it’s doing what the phone modems of old used to do – sending data encoded as different audio tones. But GGwave does this with sophistication!

It splits the data into four-bit chunks, and uses 16 different frequency offsets to represent each possible value. But for each chunk, these offsets are added to one of six different base frequencies, which allows the receiving computer to tell which chunk it’s in. It’s like a simple framing concept, and it makes the resulting data sound charmingly like R2-D2. (It also uses begin and end markers to be double-sure of the framing.) The data is also sent with error correction, so small hiccups can get repaired automatically.

What really makes ggwave shine is that it’s ported to every platform you care about: ESP32, Arduino, Linux, Mac, Windows, Android, iOS, and anything that’ll run Python or JavaScript. So it’ll run in a browser. There’s even a GUI for playing around with alternative modulation schemes. Pshwew! This makes it easy for a minimalist microcontroller-based beeper button to control your desktop, or vice-versa. An ESP32 makes for an IoT-style WiFi-to-audio bridge. Write code on your cell phone, and you can broadcast it to any listening microcontroller. Whatever your use case, it’s probably covered.

Now the downside. The data rate is slow, around 64-160 bits per second, and the transmission is necessarily beepy-booopy, unless you pitch it up in to the ultrasound or use the radio-frequency HackRF demo. But maybe you want to hear when your devices are talking to each other? Or maybe you just think it’s cute? We do, but we wouldn’t want to have to transmit megabytes this way. But for a simple notification, a few bytes of data, a URL, or some configuration parameters, we can see this being a great software addition to any device that has a speaker and/or microphone.

Oh my god, check out this link from pre-history: a bootloader for the Arduino that runs on the line-in.

As convenient as modern cellphones are, there's a certain charm to spinning an old-fashioned rotary dial to make a call -- and now, there's a cellphone that caters to that nostalgia. Brookhaven National Lab engineer Justine Haupt has developed a rotary cellphone that's not only functional, but available to make with the help of a $240 do-it-yourself kit. It's effectively a throwback to the days when phones were for calling and nothing else, plus a few present-day creature comforts.

As convenient as modern cellphones are, there's a certain charm to spinning an old-fashioned rotary dial to make a call -- and now, there's a cellphone that caters to that nostalgia. Brookhaven National Lab engineer Justine Haupt has developed a rotary cellphone that's not only functional, but available to make with the help of a $240 do-it-yourself kit. It's effectively a throwback to the days when phones were for calling and nothing else, plus a few present-day creature comforts.

Source: Justine Haupt, Sky's Edge

Ahmet Akif Kaya built a system. that incorporates an Arduino, Bluetooth module, and servo. to control his light switch from his cel phone.

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The post Control Your Light Switches from Your Phone appeared first on Make: DIY Projects and Ideas for Makers.

Today SeeedStudio launched an intriguing new Kickstarter project, the RePhone. Reminiscent of Google's Project Ara, the RePhone is a modular phone built from open source components.

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The post A First Look at the RePhone, a Modular Cellphone You Build Yourself appeared first on Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers.

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Okay, we'll admit that it looks a bit like a baby monitor. But in contrast to those over-engineered pieces of parenting paraphernalia, this DIY cellphone can actually make calls and send texts over GPRS. More importantly, Hackaday claims it was put together by a lone hacker ("Victorzie") from an assortment of off-the-shelf and modded parts, including a TFT touchscreen, lithium ion battery, charging circuit, GPRS module and shield. These components were hooked up to an Arduino Uno microcontroller running a barebones UI and then jammed into a 3D printed case, which makes the device look far more pocketable than some previous hackaphone efforts. The end result inspires big respect for the creator, but also, more grudgingly, for the pro engineers at places like Nokia, who can pull all this stuff together and even get it FCC-approved for just a few dollars.

Filed under: Cellphones, Mobile

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Source: Hackaday