![]() ![]() I use it as an interrupt on the Teensy to trigger a set of transfers. This pin may be used to output a 105.3 Hz VSYNC signal that indicates the start of a segment transmission (a segment is 1/4 of a full frame of data and requires at least 60 164- or 244-byte SPI transfers). Pure Engineering provides a SMT pad on the back of their breakout for the Lepton's GPIO3 pin. A few modifications are made to various boards. The button initially enables power and then the Teensy drives D7 to hold power. It's controlled using a soft-power switch. A LiPo charger/boost converter supplies 5V power to the various boards (the Teensy 3.3 volt regulator drives the 3.3v rail). The additional circuitry is for power management and control buttons. Most connections between the Lepton module, LCD and Teensy are direct and documented in the image and included PDF schematic using the Arduino-style signal notation. ![]() I used an Arduino shield style breakout board to make it easy to connect the Teensy to the display and imaging module. The test platform hardware is pretty straightforward. ![]()
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