encounters with electron•ics
The next step after L0x1 development board: STM32L0x1-based sensor board. Same schematic, but on a PCB which matches Hammond 1551GBK box, with a CR2032 battery holder.
Second installment of adventures in MSP430. A Hammond-boxed MSP430G2553-powered sensor board, with RFM69 radio, intended for running mecrisp forth.
While jeenode zero is a smashing board, I wanted to see if I can go for a little smaller and cheaper MCU in the actual environmental sensors I have around the house. Hence this "quick-and-dirty" "development board" with STM32L041F6P6 (TSSOP-20 package, 32kB flash, 8kB RAM), RFM69CW radio, basic assortment of LED+BOOT button+RESET button, and the pins broken out.
I already have so many USB-to-serial boards... but of course I had to try to make another one myself. I went for FT231XS chip, and tried to pack in all the features I ever wanted: selectable 5V/3.3V/no supply; proper 3.3V regulator, limiting i/o levels to 3.5V max but down to whatever the target has, compact layout.
I re-discovered that MSP430 exist and are smashing, especially with mecrisp forth. First installment.
A half-mounted Pocket Beagle cape with RFM69 radio, atmega328p, RTC, atsha204, a few status LEDs, and a JST connector for Pocket Beagle backup power.
I've made a shield for the bat board (a "batshield") to turn into an F072-based SerPlus, with some extra features: "raw" mode (works as any other USB-to-Serial with DTR), neopixel for status, FET to control output power, slide switch to select 3.3V adn 5V).
I like the size of the ARM Teensies, and I've seen (and tried) a STM32L4 breakout of this size here: Dragonfly. However I wanted something cheaper, simpler, and hand-solderable (as usual). Hence a breakout board I dubbed "the bat board" (because I'm not good with names).
Note: Main post on the main page.
A summary of hand-solderable ARM breakout boards that I've made over the past year (STM32F042F6P6, STM32F030F4P6, MKL27Z256VLH4).
A BeagleBone Black half-cape featuring: an atmega328p, a RFM69(H)W radio and a DS3231 RTC with battery backup.
Following up on X-A4U-stick rev1, I've made another revision of the board, again Open Hardware.
NOTE: The content of this post is pretty much the same as the main project page.
Delving into the world of designing PCBs and SMT soldering, I've made an USB stick with atxmega128a4u, microSD socket and a couple more goodies.
A shield for Stephan's fantastic AVR stick is in the works! It has the same format as the AVR stick itself, 5cm x 2.5cm. I want to use the AVR stick as an encrypted "mass" storage, so the features are
Stephan Bärwolf's AVR stick is a wonderful device to play with: it is a breakout of sorts for ATMEL's atxmega128a3u chip, and I like how it is designed:
As I've been moving from Ciseco's radios to HopeRF's RFM69CW's, my XRF + thermistor sensor from Ciseco needed to be "converted" as well. As RFµ-328 has the same footprint as XRF (except it's "sticking out" from the pins at the other end), with similar pinout (GND, VCC and some input/output pins at the same places), I thought that I would just replace the XRF with a RFµ-328 with a proper firmware. Success!
Recently there were several things related to Ciseco that annoyed me a bit (RFµ-328 is going to get a bigger footprint; they removed an item from a bundle in their shop from one day to the next without changing the price or announcing anything; buying SRF radios can be now only in bulk (10 minimum) UPDATE: Ciseco rescinded the decision; SRFs are available individually again. Well, too late for me.). Don't get me wrong, they still make cool stuff (like the RFµ-328), but I didn't want to depend on them for radio modules.