Incredibly, the Teensy 4.0 is priced at $19.95 ... you can shut the board off by adding a pushbutton to the On/Off pin. Pressing the button for more than five seconds disables the 3.3 V supply ...
Teensy 4.0 and 4.1 Cortex-M7 development boards are to be manufactured by SparkFun Electronics. The boards are attractive ...
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