Expansion Board Turns the Teensy 4.0 Into a 2.4 GHz Wireless Powerhouse
Arduino-Teensy4 adds Bluetooth, BLE, WiFi, and nRF24 support. It also makes MicroSD, USB Host, and the RTC more accessible.
When we covered PJRC's well-equipped Teensy 4.0 launch, about the only feature missing was wireless connectivity. Now with the Arduino-Teensy4 expansion board from BurgessWorld, you can combine all of the 4.0's powerful features with several popular 2.4 GHz wireless options.
Ports on the Arduino-Teensy4 Expansion Board add support for off-the-shelf wireless modules — a Bluetooth port for the BT-12 (BLE Serial), HC-05 (Bluetooth UART host or device), and HC-06 (Bluetooth UART device-only), as well as a dedicated port for an nRF24L01+ module, which also supports serial communication on the 2.4 GHz ISM band.
The on-board ESP-12E (ESP8266) module provides WiFi.
In addition to wireless, the Arduino-Teensy4 Expansion board makes a couple of other capabilities more accessible. Pogo pins connect to the Teensy 4.0's pads for USB Host support. There are pads for a coin cell battery holder on the back to power the Teensy 4.0's built-in real-time clock (RTC). And there is a flex cable option to connect the microSD card slot to the Teensy's native SDIO port.
Need something else, like a sensor? No problem. Arduino Uno shields are mechanically compatible with the expansion board. However, the GPIO pins have 3.3 volt logic. The Teensy 4.0 itself is NOT 5 volt tolerant. So, take care when connecting shields.
If the board's header layout looks familiar, it is because the expansion board follows the form factor of the Arduino Due (and Mega 2560). However, the double-pin header is not compatible, so shields designed for those Arduino types do not work.
The Arduino-Teensy4 Expansion Board is available on Tindie for $29.99 before shipping and module add-ons. (You must supply your own Teensy 4.0.) By the way, if you have an older 3.1 or 3.2 Teensy, BurgessWorld has an Arduino-Teensy those as well.