

No matter what you program onto Teensy, pressing the Program button always stops whatever program you've previously written and runs the bootloader, which is meant to talk to the Teensy Loader program. Until you reprogram it with something else, Teensy will always retain your program and do this when you plug it in. Then Teensy will always appear as a USB serial device, rather than RawHID. Then just reprogram your Teensy with any sketch with Arduino's menu Tools > USB Type set to Serial. It's simply how Windows 7 works, not anything specific to Teensy. Their installer adds basically the same "driver" for their boards.
TEENSY DRIVER WINDOWS NOT WORKING INSTALL
This driver install stuff for serial to work is exactly the same with Arduino. Both installers automatically detect if the Windows 10 driver is present and do not install anything on Windows 10. This driver install stuff is only needed on Windows 2000, XP, 7 & 8. Windows 10 computers have all the necessary driver stuff built in and enabled by default. There's also a stand-alone serial driver installer, which you can use to get the driver onto any Windows 7 machine without the full Teensyduino installer. This is done as the first step when you install Teensyduino. Crazy as this sounds, Microsoft designed Windows (pre-10) so a special "driver" install is needed to get Windows to actually use its own USBSER.SYS driver. Microsoft includes the actual driver USBSER.SYS, but on Windows 7 it's not enabled by default. To use it serial on Windows 7, you must first install the driver. We have used teensyduino to write the necessary code.

After releasing a button, a capital letter should be send. When a push-button is pressed a small letter should be send. We want the teensy to emulate a keyboard. You can reprogram it to be serial, but first a bit about the needed driver. Teensy does not work on Android Device as USB HID Keyboard 1 We are using a teensy 2.0 on an Android 4.4 or Android 5.x device. "Every Teensy ships pre-programmed with the LED blink example built with Tools > USB Type set to RawHID. It could be next week before I get something working when I have some time off: I found this on another forum.once you have I showing up as a serial port its just a matter of making the sketch be able to handle whatever serial protocol you want to use.
