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As mentioned in liamcottle/meshtastic-map#13 , voltages on meshtastic devices are typically 3.2-4.2V . The range on the voltageChart y-axis from 0V to 5V reduced its usefulness as changes within the normal operating range of devices were more difficult to detect. This patch changes the y-axis range to 2V to 5V. This will improve the resolution for the areas users care about. Note that this change is more conservative than requested in liamcottle/meshtastic-map#13 , as it attempts to take into account less typical voltage. A very drained battery might get around 2V, and 5V might be reported for a USB connection.