Shared projects

GPSDO to Pi cable adapter

by nsayer.

2 layer board of 1.10x0.80 inches (27.94x20.32 mm).
Shared on September 19th, 2017 00:45.

This board allows you to connect a mini-DIN 6 cable from my GPS Disciplined Oscillator’s diagnostic port to the Raspberry Pi.

The correct part for the mini-DIN 6 jack is the CUI MD-60S. The 3 pin jumper block selects the serial input on the pi to be either the GPS NMEA sentence output or the diagnostic output. The transmit output of the Pi is always connected to the GPS RX pin on the GPSDO. The PPS output of the GPSDO is fed into GPIO 18. The two pin jumper sets whether or not the 5 volt pin from the diagnostic header is connected to the 5 volt bus of the Pi. Powering the Pi from the diagnostic connector is only recommended for the FE-5680A breakout board. Added 5 volt load on the OCXO or TCXO may impact its stability. Attempting to power the oscillator from the Pi is NOT recommended.

Mount a 2x8 .1" DIP female header on the bottom of the board. Install the board on the Pi GPIO header at the left most (pin 1) end. The mini-DIN 6 cable should exit more or less right over the SD card.

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GPSDO to Pi cable adapter

by nsayer.

2 layer board of 1.10x0.80 inches (27.94x20.32 mm).
Shared on August 8th, 2017 01:45.

Go here instead.

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GPSDO to Pi cable adapter

by nsayer.

2 layer board of 0.85x0.50 inches (21.62x12.70 mm).
Shared on August 8th, 2017 00:46.

NOOOO!!

This one is no good. It needs level shifters on the TX and PPS lines. My bad. Go here instead.

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XMega_E5 Breakout v1.0.1

by nsayer.

2 layer board of 1.40x0.70 inches (35.59x17.78 mm).
Shared on July 19th, 2017 14:01.

The ATXMega chips are not available as through-hole devices. The ATXMega32E5 is a high powered substitute for the ATMega328P made famous by Arduino. This breakout board brings out all pins except port R (but instead adds footprints for a 1206 crystal) and the analog Vcc and ground (hooked together with bypass caps to digital Vcc and ground). In addition to breaking out the two PDI pins, a standard 2x3 PDI programming interface footprint is on the board.

Note that this is not a 5 volt tolerant chip.

This version adds some pin markings on the top side, where they aren’t in the way.

  • C1 & C2 - 0.1µF 0805
  • C3 & C4 - 15 pF 0805
  • R1 - 10 kΩ 0805
  • X1 - 32.768 kHz 1206
  • And, of course, IC1 is an ATXMegannE5

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ATXMega_E5 breakout v1.0

by nsayer.

2 layer board of 1.40x0.70 inches (35.59x17.78 mm).
Shared on June 27th, 2017 03:09.

There is a newer version here.

The ATXMega chips are not available as through-hole devices. The ATXMega32E5 is a high powered substitute for the ATMega328P made famous by Arduino. This breakout board brings out all pins except port R (but instead adds footprints for a 1206 crystal) and the analog Vcc and ground (hooked together with bypass caps to digital Vcc and ground). In addition to breaking out the two PDI pins, a standard 2x3 PDI programming interface footprint is on the board.

Note that this is not a 5 volt tolerant chip.

  • C1 & C2 - 0.1µF 0805
  • C3 & C4 - 15 pF 0805
  • R1 - 10 kΩ 0805
  • X1 - 32.768 kHz 1206
  • And, of course, IC1 is an ATXMegannE5

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