I added an option to buy a case or mounting plate for this board. You can find the case description HERE and the mounting plate description HERE

Teensy 4.1 Expansion board adds functionality and makes prototyping a breeze. Compatible with Arduino Uno Rev3.0 shields. Does not include Teensy 4.1 module

Features

• Based on the Arduino MEGA footprint - compatible with Arduino Uno Rev3.0 shields
• Onboard ESP8285 Serial WiFi module - fully compatible with all ESP8266 code
• 2 Onboard CAN Transceivers with 120Ohm terminator option - CAN1(Can2.0) and CAN3(CANFD)
• Ethernet jack with link indication
• Type-A USB port - supports USB-host
• CR1220 Coin Cell holder for RTC backup
• Dedicated connection for HC-05/HC-06/BT-12 Serial Bluetooth modules with LINK indication
• Dedicated connection for NRF24L01 2.4Ghz radio module
• 2.1MM barrel jack - 6.5-12V DC Input
• 2-pin MOLEX connector with mating connector and crimp pins - 6.5-12V DC Input
• Dedicated 5v and 3v3 power regulators for reliable power
• Power, D13, RX1/TX1, Bluetooth LINK LED indicators
• MOSFET prevents back-powering host USB port
• On/Off button
• ESP8255 Reset and Program buttons
• ESP8285 TX/RX pins available on 38-pin connector - allows for flashing new firmware
• All Teensy GPIO pins available on edge connectors - allows for full-flexibility when prototyping

Flexibility For Mounting Your TEENSY4.1 Module

• Mount your Teensy 4.1 using female headers, allowing for removal and use in other projects
• Elect a 5-pin female header or POGO pins for on/off, PGM, GNF, 3v3, VBAT connections to match your current Teensy connectors
• Designed for standard Teensy 4.1 Ethernet Kit (included) - Allows for continued use of Ethernet when Teensy is off-board
• 5-pin cable for connecting to USB-Host header on Teensy - Allows for continues use of USB-Host function with Teensy off-board
• POGO pin provided for VUSB connection, allows you to cut VUSB trace on Teensy to prevent back-powering the USB port on host PC

Ships With

• Teensy 4.1 Ethernet Kit
• 5-pin cable for USB-host
• Female headers for connecting Teensy4.1 to board
• Optional POGO pins for on/off, PGM, GNF, 3v3, VBAT, VUSB connections
• Male headers for Teensy4.1
• All headers/connectors unsoldered unless Assembly option selected

Resources

• Available in Github repository
• PDF of Board and Schematic files
• Example scripts for testing USB-Host, SD card, CAN transceivers