From 6dd3c76293e60c12bfcb117da33f0cbbb8c3491a Mon Sep 17 00:00:00 2001 From: Maximilian Friedersdorff Date: Thu, 23 Jun 2022 21:12:50 +0100 Subject: [PATCH] Add readme --- README.md | 12 ++++++++++++ 1 file changed, 12 insertions(+) create mode 100644 README.md diff --git a/README.md b/README.md new file mode 100644 index 0000000..e315852 --- /dev/null +++ b/README.md @@ -0,0 +1,12 @@ +# 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. -- 2.46.2