You can remove the lcd code and just monitor things from the serial monitor. txt and put it in a directory called GolfCartBatteryMonitor). Looks like that one is a candidate for replacement. Battery 4 is showing serious voltage droop under load. Two weekends later, my wife said it was slow again, so I did another data collection run. This was before I tuned the magic constants, so I do not think that Series 5 being higher than the other batteries is significant. So, I hooked up to all of the batteries in the golf cartĪnd collected some data. I want to see relative voltage as a function of time and load (driving uphill, stopped, …). The exact values do not really matter for what I am trying to do. In the end, I just measured the voltage with a voltmeter and read the analogRead value and computed a proper conversion factor. Pete recently sent out a pointer to a site that tells you how to use the internal 1.1 vref of an Atmel chip to somewhat accurately measure the input voltage. The voltage of my Arduino Uno is not exactly 5.0v. The actual resistance of my resistors is not exactly 4.7k and 3.3k. That magic constant (0.0118487) is computed as:īut things are never quite that simple. To compute the input voltage, I use some code like this: uint16_t b1 = analogRead(A0) So, how do you test 53v signals if you don’t have a fancy bench power supply? 9V batteries snap together quite nicely. I had to figure out reasonable resistor values (using resistors I have in my parts bin) for each divider network to get a little below 5V to feed to the analog in pins. Here is a thumbnail of the GCBMv1.0 board. I designed a shield for this project (I have learned that shields do not need to cover the entire Arduino board). Using all 6 of the analog input pins on an Uno, I would hook up voltage dividers to the + side of each battery (8.8, 17.6, 26.4, 35.2, 44.0, 52.8 volts). So, I figured this would be a great Arduino project. How To Test Golf Cart Batteries With A Multimeter After fully charging the cart’s battery rack, use the multimeter (Set it to 200v DC)across the posts of each individual battery. Of course, a few days later it was back to running slowly. A fresh charge and it seemed to work well. So, I checked the water level in the six 8.8V lead acid deep discharge batteries and replaced one of the 6 gauge cables that appeared corroded. Recently, my wife commented that it is running slowly. They have a golf cart that gets used and abused. As I mentioned on my profile page, I spend some time at a local horse farm.
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