Shared Projects

Breakout to connect an SRX encoder to the roboRIO.

http://www.mcyork.com/pixels to learn how these simple boards are used. The project is also on Upverter (search mcyork). #Neopixel #LedStrip #Connector.

Convertisseur RX MLINK -> PPM

MPX to PPM converter

Article

Article

Alligator clip to bread board

Breakout for a VSSIP10 chip. NB: This is a very specific application, and pins 10 and 6 are actually connected for that reason. If you need pin 10 broken out separate, cut the trace at the top of the DIP footprint and solder a jumper from pin 10 on the VSSOP to pin 10 on the DIP. ALSO: there happens to be a via right under the dot on the silkscreen; so just pay attention to where the “U1” marker is when orienting the chip. :(

Version 2 of BQ25895 breakout board. Swapped tantalum for all ceramic capacitors; Better inductor; Added screw terminal for SYS pins; Added input pins in parallel with USBin; Added footprint for optional diode (increase current); Swapped mini USB for micro; Exposed some copper for better thermal performance.

All 0805 ceramic caps; XAL50 2.2uH inductor;

Carrier for Omnivision global shutter mono camera OVM6211, connecting to fg_CC02 through FFC 20 1mm

AVR Lighthouse Beacon V1

PICAXE Lighthouse Beacon V1

This is a LEGO Minifigure sized development board using an Atmel SAMD21E 32-Bit ARM chip. I basically followed the recommended layout/setup from the SAMD21 spec sheets.

Included on Mini SAM is a WS2812B LED pad connected to PIN 27, a 0603 LED connected to PIN 15, a reset button with support components per the datasheet, and a generic button that is active HIGH on PIN 28. The 0603 LED is connected in series with a 1Kohm resistor, part of R1, and care should be taken when selecting an 0603 LED such that at a supply of 3.3V, no more than 5mA is required.

Programming port is a standard10-pin SWD for ARM based processors, which is a 2x5 1.27mm pitch connector. The SWD line is pulled up with a 1Kohm resistor, part of R1. In the BOM, either purchase the 2x5 straight pin connector OR the 2x5 POGO connector and do not populate board.

The SDA/SCL pins are pulled high with 4.7KOhm resistors, R2, per SDA/SCL recommendations.

The voltage regulator is an AP2112K-3.3V which is rated at 600mA at 3.3V. Plenty of current for the SAMD21E and a few other accessories such as the WS2812B.

This version has SMT layout for two single row 2.54mm pitch headers on the back. It is designed to be protoboard friendly and when populated the headers are the same width as a DIL package (7.62mm or .3") and span the center of a protoboard.

PINs 27 and 28 are not connected to headers - due to lack of space - but instead have two pads near the bottom of the board. PIN 27 is connected to the on-board WS2812B. PIN 28 is connected to the on-board BUTTON.

The Analog Reference (PIN AREF) - has a pair of decoupling/filtering capacitors.

The micro-USB connector has an RC filter between the case/shield of the connector and GND. If R6 and C13 are left un-populated the case/shield is an open circuit - which is the next best option. Also included is space for a PRTR5V0U2X ESD protection circuit on USB Data lines. This may also be left un-populated and USB will function normally.

I have put together a sample BOM via Mouser.com which I’m including here. It can be used as a reference. Optional, but highly recommended components: SW2812B 3535 LED, 0603 LED, SW2 (BUTTON), R4, R5, R6, C13, and PRTR5V0U2X. R1 is for the 0603 LED and SWCLK - If not populating the 0603 LED this may be left un-populated as well and programming via SWD should still work as I’ve seen other boards without the 1Kohm resistor on SWCLK. R2 is the 4.7Kohm pull-up resistor pair for SDA/SCL. Many breakout boards using chips that run off SDA/SCL typically come with the 4.7Kohm pull-up resistor pair included - as such it may not be needed on Mini SAM - but it is included for ease of future components. Please review the schematic for additional details and be aware that the BOM on Mouser.com may be out of date. The SW2812B is not in the Mouser BOM - due to lack of parts.

Mouser BOM

I would suggest not purchasing the 2.54mm pitch SMT male headers from Mouser, as you can find this much cheaper elsewhere. The best I could find on Mouser is (2) 5-Pin and (2) 6-Pin headers. Mini SAM requires (2) 11-PIN headers. I suggest buying breakaway headers in 25-50 PIN lengths.

Arduino FIRMWARE/BOOTLOADER is complete, but I’m still testing all functions. So far all PINs work in digital setup and all analog PINs work accordingly. ANALOG and special function pins (MOSI, SDA, SCK, etc) can be accessed in Arduino by their name.

Please check my Github for the latest design files and bootloade/firmware.

More details can be found on Github

H0 Aux board for ESU decoder

Motorcycle Rear Brake and Turn Signal

ToyREP Heatbed PCB heatbed for ToyREP 3D Printer and other small machines.

This thing is published with courtesy of my friend Dan Kolar who designed this PCB heatbed and made the prototype board. It is just published under my account. Please refer to him as the author.

Working area is 100x100mm Mounting holes are 105x105mm apart. Total size of PCB is 120x120mm Copper layer 35um thick

CNC milled prototype depicted is probably a bit weaker due to fabrication process and final sanding. Originally it was supposed to be 36-40W. With etching you may get better results.

Parameters of the milled prototype are:

Resistance of heat bed c. 4.8 OHM Approximately 2.5A at 12V = 30W. Max. achieved temperature 116°C (at room temperature 24.5°C) in 15-20 minutes

Detected 2 layer board of 4.72x4.72 inches (120.02x120.02mm). $111.60 for three.