Monthly Archives: December 2016

App note: Bluetooth low energy digital pedometer demo design

via Dangerous Prototypes

appnote

An application note (PDF!) from Microchip: A Bluetooth low energy digital pedometer demo design

A digital pedometer is a portable electronic device that counts each step a person takes by detecting the motion of the person’s body with an accelerometer.
This application note demonstrates the implementation of a Bluetooth Low Energy Digital Pedometer using the Microchip PIC16LF1718, a cost effective 8-bit microcontroller with extreme low power (XLP), the Microchip RN4020 Bluetooth 4.1 Low Energy Module, and the Bosch Sensortec BMA250E digital triaxial accelerometer.
The Microchip Pedometer Demo can be worn on the wrist like a bracelet/watch. The on-board RN4020 BLE module allows the pedometer demo to communicate with a smartphone or tablet on which the user’s exercise progress can be tracked. The pedometer demo is powered by a single 3V coin lithium battery (CR2032).

A high-resolution sensor node

via Dangerous Prototypes

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A high-resolution sensor node from JeeLabs:

The JeeNode Zero is intended as sensor node in a Wireless Sensor Network. This requires:

  • a sensor we can read out periodically, such as the BME280
  • being able to sleep with a very low current, as recently described
  • the ability to run the node unattended, i.e. without FTDI cable
  • formatting and sending the collected sensor readings over RF

So far, all development has been performed through FTDI. To run unattended, we’ll need to cut that umbilical cord and make the node start up by itself from a battery.

Details at JeeLabs homepage.

Free PCB coupon via Facebook to 2 random commenters

via Dangerous Prototypes

BP

Every Friday we give away some extra PCBs via Facebook. This post was announced on Facebook, and on Monday we’ll send coupon codes to two random commenters. The coupon code usually go to Facebook ‘Other’ Messages Folder . More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three times every week:

Some stuff:

  • Yes, we’ll mail it anywhere in the world!
  • We’ll contact you via Facebook with a coupon code for the PCB drawer.
  • Limit one PCB per address per month, please.
  • Like everything else on this site, PCBs are offered without warranty.

We try to stagger free PCB posts so every time zone has a chance to participate, but the best way to see it first is to subscribe to the RSS feed, follow us on Twitter, or like us on Facebook.

App note: IR remote control transmitter

via Dangerous Prototypes

application

IR remote control transmitter application note (PDF!) from Microchip:

This application note illustrates the use of the PIC10F206 to implement a two-button infrared remote controller. The PIC10F2XX family of microcontrollers is currently the smallest in the world, and their compact sizes and low cost make them preferable for small applications such as this one.
Two example protocols are shown. The first is Philips® RC5, and the second is Sony™ SIRC. These two protocols were chosen because they are fairly common and their formats are well documented on professional and hobbyists’ web sites. They also demonstrate two differing schemes for formatting the transmission.

Friday Product Post: Good Riddance, 2016!

via SparkFun Electronics Blog Posts

Welcome to the last Friday Product Post of 2016! Thank goodness this year is almost over. We thought 2016 would end up being our new overlord, but lucky for us that isn’t to be. We are still catching up from the holidays last weekend and prepping for the looming Inventory Day we have in just a few weeks, but we still have three brand-new products to bring you. So, without further ado, let’s dive on in and see what we have this week!

Accelerate faster out of 2016!

SparkFun Triple Axis Accelerometer Breakout - LIS3DH

SEN-13963
$ 4.95

The LIS3DH Breakout is a smart, low-power, three-axis, capacitive micro-machined accelerometer with 12 bits of resolution that you can use to add translation detection to your project. It would be classified as a 3DoF, or 3 Degrees of Freedom. Inertial Measurement Units (or IMUs) can provide additional space location data, such as gyroscopic or magnetometric. The LIS3DH provided on this breakout operates under the same principles but gives a few analog inputs to play with, and it has some built-in movement detection abilities.

Hamburger Mini Speaker

COM-14023
$ 4.95

This will be a a treat for your ears! The Hamburger Mini Speaker is a 2.2W economical speaker option for any project needing stand-alone sound. The Hamburger features a built-in lithium polymer battery for portable application, a 3.5mm stereo jack (sorry, iPhone 7 users) and two volume options (quiet and loud) to control how loud your sound needs to be. This speaker really can’t be compared to a good pair of JBLs, but for the price point the Hamburger won’t break the bank for your next audiophile project!

Dual 7-Segment Display - LED (RGB)

COM-13999
$ 3.95

This is not your basic 7-segment display. The Dual 7-Segment Display features two digits with an RGB LED in every single segment! You will now have a small 7-segment LED in your project with a full-color display! The Dual 7-Segment Display is breadboard friendly and possesses a digit height of 0.56in (14.22mm).

Alright folks, that’s it for this year. Let’s all hope 2017 is a much brighter year for everyone, especially the people whom many of us looked up to as kids. We have a lot in store for 2017 and can’t wait to show everything off! We’ll see you back here next year for even more new products. Stay safe this weekend!

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