LFO patch

MCP3008.py

@@ -0,0 +1,22 @@
+import machine
+
+# adapted from MCCP3008 class by @romilly, which was adapted from Adafruit CircuitPython driver
+# source: https://github.com/romilly/pico-code/blob/master/src/pico_code/pico/mcp3008/mcp3008.py
+class MCP3008:
+    def __init__(self, spi: machine.SPI, chip_select: machine.Pin, ref_voltage=3.3):
+        self.chip_select = chip_select
+        self.chip_select.value(1)
+
+        self._spi = spi
+        self._out_buffer = bytearray(3)
+        self._out_buffer[0] = 0x01
+        self._in_buffer = bytearray(3)
+        self._ref_voltage = ref_voltage
+
+    def get_voltage(self):
+        return self._ref_voltage
+    
+    def read(self, pin):
+        self.chip_select.value(0)
+        self._out_buffer[1] = pin << 4
+        self._spi