From: Maximilian Friedersdorff <max@friedersdorff.com>
Date: Thu, 23 Jun 2022 20:12:50 +0000 (+0100)
Subject: Add readme
X-Git-Url: https://git.friedersdorff.com/?p=max%2Fbattery_tester.git;a=commitdiff_plain

Add readme
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+# Battery Tester
+
+Code for running a NiMH/NiCd battery tester based on an Arduino Nano.
+
+The battery is connected directly across a diode and a low side shunt resistor.  The arduino
+ground is connected to the negative side of the battery.  The shunt and battery voltage are monitored
+over time to calculate the mAh and mWh capacities of the battery.  The capacities and the instantaneous
+voltage and current are displayed on a 4 digit 7 segment display.
+
+The diode is there to prevent dropping the battery voltage much below 0.5V.  Though I ended up
+connecting a 4.7Ohm resistor across the diode to spread the power dissipation a bit.  The battery
+voltage will continue decaying slowly below the diode forward voltage.