Update hardware_overview.md

Author: PaulZC

docs/hardware_overview.md

@@ -37,7 +37,9 @@ There are a variety of power and power-related nets broken out to connectors and
 
 ### USB-C and 5V
 
-The DataLogger IoT comes equipped with a USB type C socket which you can use to connect it to your computer to view the output and configuration through the serial terminal, or plug in a USB-C power supply. The DataLogger IoT includes the configuration channel resistors needed to tell the power supply to deliver **5V**. You can use your USB-C laptop charger as the power source should you need to, even though it normally delivers a much higher voltage. There is also a **5V** pin. However, this is not connected to the same USB bus.
+The DataLogger IoT comes equipped with a USB type C socket which you can use to connect it to your computer to view the output and configuration through the serial terminal, or plug in a USB-C power supply. The DataLogger IoT includes the configuration channel resistors needed to tell the power supply to deliver **5V**. You can use your USB-C laptop charger as the power source should you need to, even though it normally delivers a much higher voltage.
+
+There is also a **5V** power input pin. You can use this to feed in 5V power from an external source. The maximum voltage is **6.0V**. The 5V pin is diode-protected and so is the USB-C power input, so it is OK to have both connected at the same time. This pin is ideal if you want to power your DataLogger from regulated solar power or a different type of power supply. You can not use the 5V pin as an output.
 
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