Shared Projects

Companion board to Low Power Node PTH v1-1, to allow easy connection of a number of pins and provide 3V3 regulated from VCC (for use by the NRF24L01+ or other parts).

Low Power Node based on ATMEGA328P and NRF24L01+, all through-hole components. It can use a companion connection board (in which it plugs directly): Low Power Node PTH v1 Connection Board v1.

You can also add another board on the topside next to the radio (second header is provided: JP1).

There is a jumper (JP3) to choose connection of 3V3 and 5V nets (in case one uses a battery). If 5V is applied to the VCC terminal, and you want to use the NRF24L01+, then connection to the companion board is needed. This second board houses a 3v3 LDO regulator.

A second jumper (JP4) is provided to connect the IRQ output of the NRF24L01+ to pin 2 (INT0) of the processor.

A pin connected to RESET is available so you can add an external reset switch. All usefull pins are broken out, I use female headers on these points.

The board has a FTDI port for uploading sketches, and I use a version of Optiboot 4.4 which flashes the led connected to pin 14 (Arduino pin D8 instead of the traditional D13).

The crystal can be mounted on top or bottom side. If you use the companion board with screwterminals like I do, then you need to put the crystal on top-side. For shielding from the nRF24L01+ it would be better on the bottom side. I’m using both setups.

Images below are the first board spin, v1-1 adds an extra decoupling capacitor next to the interrupt-jumper.

DCC Function decoder with servo, all info about this are here: http://usuaris.tinet.cat/fmco/main_en.html

Name    Value           Manufacturer    Package         SMD package
Br1     BGX50A          -               SOT143          YES
C1      470pF           YAGEO           0603            YES
C2      100nF           -               0805            YES
J3      DCC in          -               Not populated   NO
J5      Servo1          -               Not populated   NO
J6      Servo2          -               Not populated   NO
J7      LED Out         -               Not populated   NO
R2      22K             Tyco Electronics0805            YES
R3      470             -               0805            YES
R4      470             -               0805            YES
U2      PIC12F675(SO8)  Microchip       SO8_SOT96-1     YES
U3      TA78L05F        -               SOT89           YES

U2 shall be PIC12F629 and not PIC12F675 but this MCU:s is in same data-sheet.

Isolated USB

For J.S.

SNES Bootloader EXP Board

Adapts ATtiny24/44/84/441/841 to MightyOhm HV Rescue Shield. Plugs into ATtiny85 socket on shield. Additional header supports SOIC-14 on DIP adapter. Rev 2 shrinks board and adds cutout for the Rescue Shield’s pushbutton.

From HD Retrovision website. Bridge the appropriate solder pads for the correct rom size, this is for the 27C400,27C800,27C160,27C322, or original rom transplants only and does not apply to the SMD Flash memory.

See July 2015 Nuts and Volts for details

Uses JST ZH/ZR-series connector. 4.875mm Vias
N.B. Doesn’t work with cut knob conductors.

Wiring adaptor for 16mm Alpha pots. Works well with right-angle 0.100" Molex KK pin headers. Few bonus features: - Pads for SMD resistors (for bending the taper of the pot) - Two holes on each pin when multiple wires are needed - Extra tracks on the outside for neat mounting of series resistors or capacitors

Seven required for each clock.

This board also work for the IN-8-2. Check lead placement.

Seven required for each clock.

Adds 4MB of Fast RAM to Amiga 600 or Amiga 1200
Project details: http://sakura-it.pl/sram.php
Github source: https://github.com/Sakura-IT/ppa-pcmcia-sram

definitivo