by Charlie Zhao:
The trend in automobiles and industrial systems is to replace mechanical functions with electronics, thus multiplying the number of microcontrollers, signal processors, sensors, and other electronic devices throughout. The issue is that 24V truck electrical systems and industrial equipment use relatively high voltages for motors and solenoids while the microcontrollers and other electronics require much lower voltages. As a result, there is a clear need for compact, high efficiency step-down converters that can produce very low voltages from the high input voltages.
LTC Design Note: 65V 500mA step-down converter - [Link]
Once all the components and headers were soldered in, I attached my Arduino and configured it as an ISP. I then burned the bootloader for an Arduino Uno.
I then connected my FTDI programmer and uploaded the blink sketch.Success!
Wow, that LED is super bright! It’s actually blinding and kind of hard to look at. With that, I swapped out the resistor for a 1K one in order to bring the brightness down.
Knowing that the Atmega worked, it was time to solder in the rest of the components, except for the display. Again, I don’t want to come this far and then waste a $15 LCD.
LCD clock version 2 - [Link]
Charge and protect your devices while blocking data syncing and “juice jacking.” For work, home, travel, everywhere!
If you charge via USB – which all smartphones and tablets do – Umbrella will protect your data. When connected to any USB port, Umbrella allows power to flow to your device so it can charge, but physically disconnects the data connections – eliminating any possible data theft or leak.
Umbrella USB - [Link]
This USB to serial converter project is easy to build, it is simple and inexpensive. It is based on the FT230XS from FTDI Chip.
USB to Serial converter using FTDI FT230X - [Link]
This USB to serial (TTL) converter project is easy to build, it is simple and inexpensive. It is based on the PL2303SA USB to USART bridge from Prolific.
USB to Serial converter using PL2303SA - [Link]
Get a professionally manufactured PCB for your design completely FREE!
We are happy to announce our new PCB giveaway program for the OSHW community. We will professionally manufacture 5 pieces of your PCB design and ship them to you worldwide completely free. We just ask to publish your Open Source design on Electronics-Lab.com projects section (under your name) and you will get your PCBs for free in 15-25 days (depending on destination). All designs submitted will be manually reviewed and if applicable will be processed for manufacturing.
The process is simple:
- Submit your design on the email below (Cadsoft EAGLE files in ZIP are preferred)
- We review your design based on how well it’s designed, how useful it is for the OSHW community
- You get notified by email if your design is accepted or not
- We process your design for manufacturing
- We publish your project here on Electronics-Lab.com
- You receive your PCB copies in 15-25 days
Some rules apply:
- You must be the project owner (your project will be published with your name)
- Your PCB can be 1 or 2 layers (max dimensions 10x15cm)
- Your PCB design should meet manufacture specifications (we will let you know if your board meets specs)
- You will get 5 boards for free + free worldwide shipping
- Your design should be clean and pass most of ERC and DRC rules (electrical/design rule check)
- All projects submitted should have at least: Schematic, PCB design, description / diagrams, code if available (photos are welcome)
- CadSoft Eagle is the preferred CAD software to design your PCB (exported Gerber files from other software will be accepted)
Submit your projects NOW on webmaster @ electronics-lab.com (subject: Get your PCB for Free). You will get notified if your PCB meets minimum design specifications to participate on PCB giveaway program.
Feel free to ask any questions below.
Happy PCB designing!
UPDATES – Projects approved so far:
- Open Source 3.2″ TFT Smart Display
- FM Transmitter MAX4467 & MAX2606
- DC Motor Driver using L293D
- LED Binary Clock – Arduino Shield Compatible
- 24×6 LED Matrix Control Circuit
- Automatic School Bell
- BO.Duino – ATmega328 Arduino board
- FM VCO Transmitter
- Low Frequency Spectrum Analyzer
- MAX2606 – Hands-Free Car Kit for Cell Phones
- Simple SMD LED tester
- miniLOG – Precision Standalone Voltage Logger
- MCU Controlled Spot Welder
- AMP – Arachnoid Mobile Platform
- Temperature Controlled PC FAN
- Variable Power Supply with LM7812
- ATmega64 Development Board
- EGYDuino – Arduino compatible board
- 8 Opto-isolated Relay board
- Serial AVR and PIC programmer
- 0-30V Laboratory Power Supply
- Thermocouple Type-K amplifier
The LTM2884 is a USB μModule Isolator that combines USB data communications and USB power, and guards against ground-to-ground differentials and large common mode transients. The rugged interface and isolation makes the LTM2884 ideal for systems implementing USB in harsh industrial or medical environments where protection from ground differences is required. The LTM2884 separates grounds by isolating a pair of USB signal transceivers using internal inductive signal isolation, providing 2500VRMS isolation plus superior common mode transient rejection of >30kV/μs. The LTM2884 features an integrated, low EMI, external or bus powered, DC/DC converter that powers the isolated transceiver and provides up to 2.5W of isolated power for USB peripherals or hub/host controllers.
LTM2884 – Isolated USB Transceiver with Isolated Power - [Link]
This is a dual MCU programmer which supports both AVR and PIC mcu and there is a switch to select between them.
It’s easy to manufacture and have only through hole parts.
Serial AVR and PIC programmer - [Link]
By Dexter Johnson:
Quantum dots have offered an attractive option for photovoltaics. Multijunction solar cells made from colloidal quantum dots (CQD) have been able to achieve around 7-percent conversion efficiency in the lab. While figures like this may not seem too impressive when compared to silicon solar cells, their promised theoretical conversion efficiency limit is an eye-popping 45 percent. This is possible because when a single photon is absorbed by a quantum dot, it produces more than one bound electron-hole pair, or exciton, thereby doubling normal conversion efficiency numbers seen in single-junction silicon cells.
Quantum Dot Solar Cells Break Conversion Efficiency Record - [Link]
by Srdjan Misic
YouTube is full of Christmas gift freak-out videos, with kids loosing themselves in episodes of hysterical happiness because they discovered an Xbox or something like that under the tree. Screaming and jumping around the room, completely loosing it.
Although adults, some of us were on the verge of reenacting some of those YouTube classics. Most of all, it’s the guys in the anti-static blue shirts that work in the manufacturing area. The occasion, of course, was the arrival of four brand new machines.
mikroe.com – These are the new machines that tripled our production capabilities - [Link]