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A DIY Calorie Counter More Accurate Than a Smartphone

Cars That Think

The IMUs are connected to a Raspberry Pi using the I2C protocol. Tracking how these are eliminated from the body in urine gives us the rate of carbon dioxide production, which is directly related to energy expenditure. The counter uses two of them, one attached at midthigh, the other at midshank.

DIY 99
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IoT-ize Your Old Gadgets With a Mechanical Hijacking Device

Cars That Think

Just about every device you own is probably available with Internet connectivity. needs Internet connectivity is up for debate. Connectivity usually comes at a premium, and it also usually involves buying a brand new whatever it is, because new hardware and software and services are required.

DIY 141
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Solar Power for Sheds and Electric Car Charging Solutions

Setec Powerr

With companies like Setec Power launching innovative products like their Home EV Charging Solar Carport System, the horizon for solar applications is broadening. – Connect Devices: Utilize the stored and direct solar energy produced as required by establishing connections to the tools, lights or appliances in your shed. .

Solar 98
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Building the Future of Smart Home Security

Cars That Think

It’s nearly impossible to find a household today that doesn’t have at least one connected smart home device installed. This is particularly true for devices that provide security with 38 percent of Americans owning a home security product. Managing the server activity of those connected devices is a unique challenge to SimpliSafe.

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Can This DIY Rocket Program Send an Astronaut to Space?

Cars That Think

That successful mission in August 2018 was a huge step toward our goal of sending an amateur astronaut to the edge of space aboard one of our DIY rockets. The Spica astronaut's 15-minute ride to the stars will be the product of more than two decades of work. So on that small prototype, I had to sew 972 connections.

DIY 140
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A Web-Enabled, High Quality, DIY Audio Amp

Cars That Think

November 2018 Hands On article, “DIY Pro Audio ” in IEEE Spectrum , and it convinced me it was possible, although I wanted to go beyond just a power amplifier to something more like my lamented Sansui. To this board I also connected a tap along with a low-pass filter and output—just in case I decide to build my own subwoofer speaker!

DIY 99
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iRobot Launches Create 3, with ROS 2 Built In

Cars That Think

It’s a little scary to recall that when iRobot last released an update to the Create DIY/educational robot platform, the calendar read 2014 (!). For more details on the Create 3, we spoke with Charlotte Redman, iRobot's product manager, and Steven Shamlian, principal electrical engineer.

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