Solderdoodle is a portable, cordless, USB rechargeable soldering iron. Solarcycle @ instructables.com writes:
After learning how to use 3D printers, one of my friends asked if there was such a thing as a USB soldering iron and I said that I had instructions to build one, but the battery was external. I then realized that I could create my own case design on a 3D printer and put the battery, charge controller, and other parts inside as one single unit! It worked! .stp files for the case are provided below.
Solderdoodle: Open Source USB Rechargeable Soldering Iron - [Link]
Brian Dorey made this DIY USB to RS485 adapter, that is available at Github:
We looked for a full-duplex ready-made adapter but all the ones we found are only half duplex devices and as we needed to be able to supply 12 volts via the RJ45 connectors on the slave boards we decided to make our own USB to RS485 full duplex adapter using a USB converter chip from FTDI.
The board uses an FT230X with an RS485 converter chip which outputs to a set of header pins and also an RJ45 socket.
The new adapter board can supply power to the slave devices through the USB port or can be powered from an external supply by removing a power selector jumper. The board also has an on board 120R terminator resistor with selection jumper and LED’s to show serial activity.
USB to RS485 adapter - [Link]
Cypress Semiconductor are offering the CY8CKIT-049-41XX development board which contains a 32-bit CORTEX-M3 48 MHz ARM processor for just $4.00 (£2.62 in the UK). The board is quite basic but offers a full-speed USB to serial bridge controller chip on a snap-off portion of the PCB to allow for bootloading the target PSoC device and communication with the board via a computer’s USB port. Software tools for the kit include the PSoC Creator and EZ-USB Software Development Kit (SDK).
The kit supports either a 3.3 or 5 V supply voltage and the device can be programmed using the bootloader or the Cypress MiniProg3 programmer. Cypress Semiconductor are marketing these ready-to-run kits as an alternative to supplying device samples.
Low-cost ARM Development Platform - [Link]
Alan Parekh @ hackedgadgets.com writes:
This video was going to be a repair of this Portable USB Charger but as it turns out there wasn’t anything electrically wrong with it. It didn’t work out of the box but I think that must have been caused by some oxidation on the USB contacts. It seems to work like a champ now. The control chip for the DC/DC converter looks to be this DHMF chip. I have never seen the swoop logo before and can’t seem to find any data on this 5 pin device though. It is probably similar to the LT1302 (PDF) that the Adafruit MintyBoost uses. The efficiency of this circuit doesn’t appear to be as efficient as a proper one built using the LT1302 though since when drawing 500mA from the output it can maintain very close to 5 volts out (2.5 watts) but needs an input of 3 volt at 1.3 amps to do it (3.9 watts). This gives us an efficiency of about 64%, the graph from the datasheet of the LT1302 indicates that it could perform at about 86% under these conditions.
Portable USB Charger Teardown - [Link]
Add a video monitor to your arduino via serial !! You can use it as your prefered output or as a secondary screen for the results of your sketch.
All you send through the serial will be printed out on your TV screen. (You can use an old TV).
On Arduino, you must connect TX from arduino to RX (blue borne) of this my rig adapter. Or on a PC, you can connect direct via USB cable.
Add a video monitor to your Arduino using USB Serial TTL to RCA TV input - [Link]
One basic need of a computer scientist is to measure the power that a USB device drains off the PC. This device is plugged between the PC and a USB device and displays the current on an LCD. For currents under 100mA it is displayd in 0.5mA steps and 1mA steps for currents over 99.5mA. It is built with an AVR programmed in assembler.
USB Power Monitor - [Link]
This project is a USB to Serial converter using an ATMEL AVR microcontroller. There are two version of the converter, one with SMD parts and another with TH parts. The mcu used is an ATmega8 and USB communication is done using software on AVR mcu. It’s based on the software USB implementation of AVR-CDC. Firmware can be downloaded from the download section of CDC-RS232.
USB to Serial Converter using AVR microcontroller - [Link]
This project started out from a need to build a simple device for monitoring the CAN bus. I choose the NUC140LC1CN 32K Cortex-M0 microprocessor from Nuvoton for major reason – it has both USB and CAN peripherals.
CAN to USB Interface - [Link]
IViny is easy to use and USB based simple low-cost DAQ and measurement device for data acquisition application. It can be used quickly without any low level electronically knowledge.
- 2 channels 0 – 5V and 0 – 3V digital input/output
- 2 channels 0 – 5V 10 bit analog input
- Channel maximum current 20 mA
- ATTiny85 based
- USB supply, no need external supply
- V-USB based communication
- PC user interface
- 150 S/s (it will increase with future next firmware upgrade still under development)
- 50 mm x 33 mm x 17 mm
IViny Compact Data Acquisition Device - [Link]