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• Solderless (!) Teensy 4.0 holder
• Optional High efficiency battery charger / Uninterruptible Power Supply
• Access to all 34 I/Os with power rails
• Standard Teensy footprint lets you prototype with your favorite Teensy shields
• Micro SD card slot (Native SDIO pins, doesn’t tie up any standard I/Os)
• USB Host connector for keyboards, mice, etc.
• Barrel jack for external power sources up to 18V
• PRGM and ON/OFF buttons for easy development
• CR1225 battery for RTC backup
• Optional SPI flash memory (256Mbit)
• Optional 500mAh Li-ion battery for testing your projects on the go (requires battery charger option)
• Piezo buzzer and SK6812 for audio/visual feedback
• Assembled on a premium Gold plated PCB

If you’re like me, it’s really nice to have a compact platform to test out your ideas without any dangling cables. That’s why I made this, a portable Teensy 4.0 breakout board that does it all. I designed this breakout board with a few things in mind. For starters, I wanted it to be highly configurable so I could adapt it suit my project’s requirements. Second, I wanted it to be easy to use and intuitive to speed up the development process. No more messing around with unnecessary wiring, all the essential stuff is contained to the board, so your projects look more simplistic and professional.

There are a few distinct features that set this breakout board from the rest. For starters, NO SOLDERING IS REQUIRED! No tricky surface mount soldering, yet you still have access to all the I/Os. No more frustrating desoldering if you decide you want to use the Teensy for something else!

There’s also a super handy battery charger option that lets you use your Teensy 4.0 off the grid. It incorporates a high efficiency battery charger and a 3.3V buck-boost switching regulator so you can squeeze the last bit of power out of the battery. This option would be perfect for wireless sensor nodes or data collection applications that need to run for a long time without external power.

Getting Started

1. Before you start, make sure you cut trace underneath the Teensy to separate VIN from VUSB, otherwise the Source indicator LED will not be accurate.
2. To install the Teensy, first take the bracket board and nestle the Teensy inside so that it’s flush. If the fit is too tight, run some sandpaper along the edge of the teensy until it fits without too much force.
3. Stack the main board, spacer, bracket, and faceplate as shown in the pictures.
4. Use the included M3 hardware to hold the assembly in place. Make sure you put nylon washers on the bottom to avoid damaging the board.
5. You’re all set, now you can start prototyping your next awesome project!

Additional Information

• If you are supplying power through the barrel jack or the VIN pin: If the voltage is below 5.5V, you can bypass the preregulator circuit. Just invert the SMD underneath the power jack labeled "JP12".

• If you chose the power management board option, this lets you use 5V devices from a single cell Li-Ion battery. The 5V output has a 500mA current limit, which is shared between devices plugged into the USB Host connector and the 5V_AUX pin.

• With the power management board installed, the maximum current that can be drawn from the 3.3V power rails is 1A. Without the battery charger module, the 3.3V rail is regulated through the Teensy and is limited to 250mA.

• Holding down the ON/OFF button for 5 seconds will put the Teensy into a very low power state which can help extend battery life. The PRGM button has the same function as the Program button on the Teensy. Pressing either PRGM button will put the Teensy into program mode.