Merge pull request #467 from adafruit/hx711

adding HX711

Author: FoamyGuy

.gitmodules

@@ -1007,3 +1007,6 @@
 [submodule "libraries/drivers/ds248x"]
 	path = libraries/drivers/ds248x
 	url = https://github.com/adafruit/Adafruit_CircuitPython_DS248x.git
+[submodule "libraries/drivers/libraries/drivers/hx711"]
+	path = libraries/drivers/libraries/drivers/hx711
+	url = https://github.com/adafruit/Adafruit_CircuitPython_HX711.git

docs/drivers.rst

@@ -497,6 +497,7 @@ These provide functionality similar to ``analogio``, ``digitalio``, ``pulseio``,
     CST8XX Capacitive Touch <https://docs.circuitpython.org/projects/cst8xx/en/latest/>
     DS2413 OneWire GPIO Expander <https://docs.circuitpython.org/projects/ds2413/en/latest/>
     FocalTech Capacitive Touch <https://docs.circuitpython.org/projects/focaltouch/en/latest/>
+    HX711 24-bit ADC <https://docs.circuitpython.org/projects/hx711/en/latest/>
     MCP2515 CAN bus controller <https://docs.circuitpython.org/projects/mcp2515/en/latest/>
     MCP230xx GPIO Expander <https://docs.circuitpython.org/projects/mcp230xx/en/latest/>
     MCP3xxx SPI ADC <https://docs.circuitpython.org/projects/mcp3xxx/en/latest/>