simpleRTK2B（F9P）https://www.ardusimple.com/product/simplertk2b/
raspberryPi3A+ HAT
for gpsnavi https://github.com/mnltake/gpsnavi
-connect pi UART(GPIO14/15) to F9P UART1
-pull out I2C(GPIO2/3)
-pull out shutdownswitch (GPIO3/4/17)
-pull out keypad(GPIO9/11/5/6/13/19/26)
-pull out led(GPIO21/20/16/12/7/8/25/27/22/24/23)
-pull out neopixel grove connector (GPIO18)
-pull out workswitch (GPIO10) and +12V relay
Case 3Dprinter stl files
