Last November, johngineer proposed #hackfriday, a day for hackerspaces to work on projects. Tomorrow is a holiday from work for many of us, so a bunch of will be hacking away at NYC Resistor. What projects will you work on this long weekend?
I recently acquired an early 1900′s Gundlach 4×5 view camera with a few lenses and designed an adapter to mount a modern DSLR body where the film plane would go. There is no lens connected to the SLR — the 4×5 lens images directly onto the CMOS sensor. The bracket design is thing:18989 and can likely be adapted for other field or monorail cameras. There are some limitations with the design, but it works acceptably well in practice.
Have you switched your QSOs to PSK31 or some other digital mode, but miss the joy of sending CW with an iambic paddle? Then here’s a project for you.
New in the NYCR vending machines are Teensy 2.0 boards. They have ATMega32U4 chips, which have the built in USB drivers and, via LUFA, can appear as any USB device, not just a serial communications device. Want to make a MIDI device show up as a USB keyboard? Or a core memory as a mass storage device? You can do that! The USB doesn’t consume a UART, so there is still a serial port available for interfacing with GPS or other external RS232 devices.
PJRC makes the Teensyduino plugin for the Arduino IDE and a set of compatible libraries so that you can use it with your Arduino sketches. Or you can drop into straight C and take full advantage of all of the AVR pins.
Update: They are very popular! Three were bought during Craftnight tonight.
This weekend PMF and I cleaned an IBM 129 Card Data Recorder and were able to fairly reliably punch cards once we were done. When we started it would frequently jam during feeding, mis-feed during the punch, and not cleanly stack the cards in the output bin.
Most of the problem was thirty years of dust, card fiber and grime built up in the mechanisms. The output hopper was full of it and needed a good cleaning to reliably pick up cards into the output stack:
Adam and I upgraded Hexascroller to control 5 m of Adafruit RGB LED strip through a spare serial port connected to a Teensy 2.0 that drives the strip via SPI. Now when a new message is displayed, the accent lights switch to a bright flashing mode to attract attention, then they will return to soothing, slow color changing mode.
Click the “Read more” to see additional photos of the installation and setup.
Using Darrel Tan’s Programming the ATTiny10 instructions and a SOT-23 breakout board by Raphael, I was able to flash one of these very small MCU chips. Given the small package, these programmable devices can be dropped just about anywhere on a circuit that a transistor would be used.
Unlike Tan, my FTDI breakout cable does not have DTR, so the reset pin on the chip needs to be pulled low manually to put it into programming mode, and the pinout adjusted. Full instructions after the break…