Hi everyone -- so we are in the process of using Teensy3 more instead of Teensy++2 and I find myself wishing for a breakout board for Teensy3 (at the moment I have 5 of the 100-mil white proto boards on my bench with various sensors and displays connected to different Teensy modules), and google shows only breakouts to the Arduino shield form factor. I'm giving a talk at end of Sept using Teensy as a smart HVAC thermostat and the question of available hardware is probably going to be asked. Here is some of my wish list. If anyone has any ideas to add please do. We could sell these as bare boards or assembled. I don't plan to give away the board gerbers but do plan to publish code and schematics. Here's the list of wishes:
- Teensy3 socket accepting pins underneath and in center of PCB. If Teensy has wirewrap style headers installed, it will plug into the sockets on the board and still have header pin exposed on the top for attaching a scope or .025"-square prototyping leads
- Rows of holes on 100-mil centers for mounting headers or sockets for access to all I/O pins from Teensy3
- Power supply 5-24 V AC/DC input, switching type 3v3 output at 1000 mA or more, 5.5x2.1 jack and screw terminals and latching pin connector. We are trying to standardize on all 3v3-capable devices so don't plan on supporting 5v0 if possible since that is a can of worms.
- Possible POE (Power Over Ethernet) support
- W5100 (or newer) Ethernet interface with RJ45 jack
- Radio pattern for Hope RF RFM12B, RFM22,23 modules such as used on JeeNodes. These are small and cheap and support 433, 866, 915 MHz ISM bands
- Xbee pattern for Digi radios? Opens up WiFi, Zigbee, BT, more
- JeeNode and Olimex expansion headers to use their sensors
- Serial memory (SPI I think since it is much faster) to hold more configuration or logging
- micro SD socket for logging
- I2C clock and calendar chip with coin cell socket for backup
- Buffers on SPI so you can run longer wires (at slower speeds)
- Repeater on I2C so you can run longer wires (at slower speeds) see http://ics.nxp.com/products/i2chubs/; any better than others?
- Possible I2C to Maxim 1-wire chip DS2482/2484 family for stringing e.g. temperature sensors tens or hundreds of meters away. Just got some samples of these bridge chips. Have not tried them yet.
- maybe some 2N7002 or 2N439 NFETs to drive relays or large LEDs
- RGB LED for local board status
- Maybe a small pushbutton or two: for what? Remap the Teensy reset PB to a more accessible place on the breakout board.
- board size perhaps 100x100 mm Euroboard if all the stuff will fit, fits in our DIN-rail or wall-mountable plastic Snap-Track. Smaller if possible.
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