Trandi blogged about his RC servo and stepper motor project. He writes:
For those interested in reproducing this example:
The board is called “EP2C5 Mini Board” and has a EP2C5T144C8 Cyclone II FPGA on it
I used a standard, 9grams micro RC Servo
I used a 28BYJ-48 stepper motor and it’s driver (you can purchase these as a bundle for very cheap on dealextreme or banggood)
I used the free edition of Quartus II from Altera, version 13.0 SP 1 (be careful, later versions do not support Cyclone II FPGAs anymore)
I created a simple project, pasted all this code as a single module (it would of course be cleaner to separate the RC Servo and stepper control code into independent modules)
made the “Top level entity” in the General configuration page equal to “counter” (the name of my module)
used the Pin Planner to assign the inputs/outputs as follows:
FPGA : RC Servo and Stepper motor control in Verilog - [Link]
Remote control your electrical devices through your local network or internet. The circuit contains one output (Relay) and one input (isolated input). The whole project was built by using arduino nano platform and an ENC28J60 ethernet module. It can be used the W5100 ethernet module instead of ENC28J60, by replacing the UIPEthernet library to Ethernet library.
Moreover, the control is made from the Android application I wrote and it’s available on Google Play (https://play.google.com/store/apps/details?id=com.serasidis.NetworkRelay).
The schematic diagram, arduino sketch, photos and demonstration video is on my web site:
Arduino Network relay - [Link]
Davide Gironi writes:
DS18B20 is a programmable resolution 1-wire digital thermometer.
It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C.
This library is an AVR implementation to retrive temperature from DS18B20.
Built using the reference document: “Using DS18B20 digital temperature sensor on AVR microcontrollers” by Gerard Marull Paretas, 2007.
A DS18B20 1-wire digital thermometer AVR ATmega library - [Link]
by Bray @ coreforge.com:
I’ve had a CNC mill for a few years now, and while many homemade CNC mills use EasyDriver or Pololu, mine came with a sturdy, generic TB6560 controller board. For those unfamiliar, boards like this are interfaced using an old fashioned LPT parallel port, which was initially an annoyance, but quickly became impractical and a hassle, having to use an old PC with VNC installed. The board has plenty of power to push the steppers around, far more than any of the smaller / cheaper solutions had to offer I think, so I wanted to try and teach this board a few new tricks, and let me interface with it using a more modern interface.
GRBL CNC USB to TB6560 Interface using Arduino - [Link]
by R. Colin Johnson @ nextgenlog.blogspot.com
It takes 100 crazy ideas to come up with one good one–like the finFET. Likewise, of the 100s of crazy ideas engineers are trying today, some will keep Moore’s Law alive indefinitely–or at least until we start using synthetic biological computers instead!). An optical emitter can be easily added to a III-V chip to make on-chip communications between electronics travel at the speed of light.
No End to Moores Law with III-V Gallium Arsenide Materials - [Link]
by Martin Jagelka , Martin Daricek & Martin Donoval :
Continuous monitoring of heart activity permits measurement of heart rate variability (HRV), a basic parameter of heart health and other diseases.
This Design Idea is a new design of pulse oximetry that excels in its simplicity and functionality. Due to its capabilities, it can be used as a standalone device, able to monitor heart rate and oxygen saturation.
The core of the system is composed of the ultra-bright red LED (KA-3528SURC), infrared LED (VSMB3940X01-GS08), and a photodiode (VBP104SR) sensitive to both wavelengths of light at the same level.
Simple pulse oximetry for wearable monitor - [Link]
by simsalapim @ instructables.com:
Ever been looking for your keys, and wanted to call them, before you realize that they are hideously analog pieces of metal? Or wanted to let someone into your house when you’re not at home, without having to lend them your keys?
Lockitron was the solution that descended from hardware heaven – a device that fits over the lock on your door and that is controlled via an app. It raised $2.2M on Kickstarter but missed its original shipping deadline by 1.5 years, leaving its backers in a deadlock (pun!). Are you one of them? Stop glaring at your empty mailbox and channel all your frustration into making your own awesome smartphone connected lock – The Bean Lock.
Open source BLE door lock - [Link]
“Hardwired TCP/IP” instead of a software solution? The result is higher performance and reliability. This time the webinar is focused on TCP/IP chips and modules from Wiznet
17.9.2014 – 10:00 CET
Programme of webinar:
- WIZnet company and short core tech. introduction
- “Serial-to-Ethernet” and “Serial-to-(serial) WiFi” by WIZnet chips and modules
- Live presentation and hand on demo how-to-start and – use new S2E-modules
SOS webinar: Internet of Things by one chip - [Link]
by Mark “hiddensoul” Clohesy @ hamshack.org:
I was looking at a low cost way to build a 10Mhz frequency for my electronics lab. I had a few options that I could pursue, these were…
GPS Disciplined Crystal Oscillator (GPSDO)
Rubidium atomic standard (RbXO)
Caesium atomic Standard
Oven Controlled Crystal Oscillator (OCXO)
So to make a choice on what I should use I had to come up with design parameters for my frequency standard, these were as follows.
Had to be low cost
Had to be portable
Had to work inside of a building
Had to be stable, better then +/- 0.5 hertz drift over 2 minutes
Low Cost 10Mhz Frequency Reference - [Link]
The LTC6948 is a high performance fractional- N PLL with 6GHz-plus integrated VCO. In the heart of the LTC6948 is an advanced fourth order delta-sigma modulator that employs intelligent noise-shaping techniques to minimize noise contribution without creating the fractionalization spurs found in most fractional-N PLLs on the market. This results in a device with the full benefits of fractionalization – from frequency agility to overall improved phase noise – but without the traditional drawbacks of using a fractional-N PLL. In other words, the LTC6948 is a fractional-N PLL with integer-N spurious performance. Pairing these benefits with industry-leading 1/f noise and reduced in-band phase noise, makes the LTC6948 ideal for demanding wireless, test and measurement, and military applications.
LTC6948 – Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO - [Link]