![]() ![]() A pair of 4.7 kohm pull-up resistors pulled to 3V3 is connected to the I2C signals. I also removed the 2-pin power input (J3) that pokes out of the back of the breakout. I brought the signal out to a pin plugged into the same header that the rest of the breakout board's pins connected to. 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. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |