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Pi Duino for the Teensy3

 

 Teensy3 shield for interfacing with Raspberry Pi or Wiz820io

 

 

Pi Duino Bare Bone for the Teensy3

 

 Teensy3 Base Board with shield form factor for interfacing with Raspberry Pi

 

Underneath the Teensy3 BB are a 3.3V regulator and a reset pin.

 

The Teensy3 BB plugged onto a Raspberry Pi

Operating modes apply to both Teensy3.0 and Teensy3.1:

Mode 1:
A 3.3V shield for the Tennsy3. The Teensy3 is plugged in, but the RPI is not. Two jumpers on the header YH1 are not needed. Two jumpers on the header H3 are placed vertically on the up 4 pins.

Mode 2:
A 3.3V shield for the Raspberry Pi. The RPI is plugged in via a 2x13 connector, but the Teensy3 is not. Two jumpers on the header YH1 are placed horizontally on the left 4 pins. That's the normal position labeled with a "N". Two jumpers on the header H3 are placed vertically on the low 4 pins.

Mode 3:
Both the Teensy3 and the RPI are plugged in. 
The RPI is plugged in via a 2x5 connector, UART's of the RPI and the Teensy3 are connected together. 
They can communicate each other via UART's. 
When UART communication is used, the shield signals belong to the Teensy3. 
Two jumpers on the yellow male header YH1 are placed horizontally on the right 4 pins, labeled with the letter "R". It acts as a null modem and reverses UART signal direction for the RPI.
Two jumpers on the header H3 are placed vertically on the up 4 pins if I2C communication on the A4-A5 is controlled by Teensy3, on the low 4 pins if I2C communication on the A4-A5 is controlled by RPI.

Mode 4:
The RPI is plugged in via a 2x13 connector, Both the Teensy 3 and the RPI can communicate each other on SPI or over any I/O signals. That's for advanced users that know how to avoid signal contention.  

It's very easy to operate in mode1 using the free PCB.
Do not need to install the headers H1 and YH1, resistors R3-R10 and R13-R16.

Schematic is available at Roger's web:  http://www.rasmicro.com/Sleeping_Beauty/