Bluetooth 4.0 introduced the Bluetooth low energy (BLE), which is a version of Bluetooth protocol designed for devices with power constraints like battery powered sensors. Bluetooth low energy beacons are BLE (Bluetooth Low Energy) enabled devices, they repeatedly broadcast radio...

By Bonnie C. Baker (WEBENCH® Senior Applications Engineer): Numerous filter approximations, such as Butterworth, Bessel, and Chebyshev, are available in popular filter software applications; however, it can be time consuming to select the right option for your system. So how do...

The RFM69GW is a RFM69 to MQTT gateway that uses the ubiquitous ESP8266 chip. There are two or three similar projects that I'm aware of but I've put together some hardware and firmware features that make it different. by Xose Pérez: I'm using Felix Rusu's RFM69_ATC library so it...

by Lothar Wendehals: Did you ever program an Arduino? Have you ever been worried about complex control flows written in pure C? Maybe you have already heard of statecharts and state machines? In this blog post, I will show you how to program an Arduino in just 5 minutes in a...

“Teensy” is a tiny size board compatible with Arduino software and libraries. Teensy 3.1 & 3.2 was the last version from Paul Stoffregen (PJRC Company) the creator of Teensy. Paul started a Kickstarter campaign for The new Teensy 3.5 and 3.6 and until the time of...

Projecta, the Affordable & Faster PCB Prototyping Machine has launched their kickstarter campaign. Check the kickstarter page on the link below. Projecta is an affordable desktop CNC machine optimized for making circuit boards in new innovative way. Our dream is to print PCB...

bobricius @ hackaday.io has designed an ultra thin custom display, requiring only 6 gpio pins to drive 30 leds. FEATURES: - 1.05x0.48 inches (26.67x12.22 mm) - 30 led - any color - ultra thin .... etc. on 0.8mm board - only 6 gpio - ideal for wrist watch 4 digit...

Philip Kane @ jameco.com has published an article about the famous 555 timer IC and how to configure in monostable and astable modes. The 555 timer was introduced over 40 years ago. Due to its relative simplicity, ease of use and low cost it has been used in literally thousands of...