and they can be surprisingly useful... lifting heavy crates, pulling cables through long and narrow crevices...

Advanced Tutorial for NRF24L01 / Arduino #1

Advanced Tutorial for NRF24L01 / Arduino #2

A radio antenna can't just be any length of wire because the wrong length antenna will attenuate the signal and that's energy being wasted and not being radiated out to increase the range of your transmitter or receiver.

 

Many organizations disregard the security of Bluetooth networks as a concern because they consider Bluetooth to be a short-range technology. But Bluetooth Class 1 devices are capable of transmitting at 100mW, which have a standard range of approximately 100 meters.

This is comparable to that of an 802.11b WLAN device. Guess where you'll find many of such Class 1 Bluetooth devices?

Yep, are you leaving your laptop and desktop systems wide open to attack?

​On another note, while everyone's thinking of Wi-Fi and RC, maybe Bluetooth is a viable way to control a robot wireless too ... after we harden it though.

If you need to plan a Wifi deployment for your house or for work, it's always good to understand how Wifi fundamentally works so that you can filter out all the marketing-speak that manufacturers put out and end up with a realistic design. And you'll understand why RSSI recordings are not the most effective way to record range.

read on...

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While we’ve seen 3D printed flowers used as unique works of art and advertisements, they’ve also proved to be very helpful when used to study plant evolution, and they can even have applications in the field of soft robotics. This is what a team of scientists from Nanyang Technological University (NTU) in Singapore are currently studying, within the fascinating field of biomimetics. 
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A clear explanation on how Ultrasonic Distance Sensors work. Three Sensors HC-SR04, HY-SRF05 and US-015 are compared.
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Seems that US-015 is the most consistent.
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Looking to add Radar in your mix of Collision Avoidance tools? Watch this video by Andreas Spiess.
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Seems like the HFS-DC06 with a min range of 1m to about 8m and best sensitivity of the lot but with a huge caveat, only covers 180 degrees.

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Everyone's talking about it but do people really know the difference? 

For most people, it really doesn't matter as long as it works. However, if you aim to work in the field, or just to broaden your knowledge, here's a post you'll find really helpful.

Read on...