Board voltage

Created by: afesuazo

energy_monitor.py

@@ -55,6 +55,17 @@ class EnergyMonitor:
                     f"If you're not sure where or how the other power monitor session is running, you can kill it with the following command: kill -9 {pid}")
                 self.cleanup()
 
+    def get_board_voltage(self):
+        """ Take 10 sample readings and return the average board voltage from the +3.3V rail. """
+        samples = []
+        while len(samples) <= 10:
+            data = self.read_adc(4)  # channel 4 is the 3.3V ref voltage
+            samples.append(data)
+
+        avg_reading = sum(samples) / len(samples)
+        board_voltage = (avg_reading / 1024) * 3.31 * 2
+        return board_voltage
+
     def read_adc(self, adc_num):
         """ Read SPI data from the MCP3008, 8 channels in total. """
         r = self.spi.xfer2([1, 8 + adc_num << 4, 0])