![]() ![]() Teensy 4.x has 1,048,576 bytes of RAM, and can run at up to 600 MHz. Teensyduino developer, Paul Stoffregen, is a frequent contributor to Arduino (authored many common libraries et cetera), and I've found the Teensy forums useful. Biggest differences are in fast I/O port access (instead of PORTD etc., you use digitalWriteFast() like in standard Arduino, digitalWrite() works too), interrupts, and timers: Teensyduino has easier interfaces for using all those. Of course, you'd need to port your Arduino project over to Teensyduino, the add-on for Arduino for Teensy support. If using external power, note that the board does not have diodes, so you'll need to cut the VUSB trace (as described in the Teensy card) to make it externally powered only or use an USB cable with the +5V line disconnected to connect the Teensy to your development machine while externally powered. Note that you can connect the main USB connector to your development host while the barcode reader is connected to the Teensy USB Host connector, as long as the barcode reader doesn't require too much current (keeping the maximum current from the development host via the USB bus under 500mA). I also like to get the Ethernet kit ($4 USD) just in case I want to use the hardware 10/100Mbit wired Ethernet connection also. I'd suggest a Teensy 4.1 (about $27 USD), plus the USB Host connector (about $3 USD, only need to solder standard 4-pin 0.1" spacing pin header).
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