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Function update_display does just that – updates the display.Function check_relays checks the timer counter and when it reaches the max it moves the charger to the next relay in line.If there is 8v or more it adds that connection to the charging loop. The function read_show_volts checks each connection to see if there is a battery connected by testing for greater than 8 volts available.There are basically 4 functions called in the program. I use 2 1k resistors as a voltage divider for each input to the MCP-3008. So I connected up an MCP-3008 8 channel analog inputs. With an Arduino UNO A4 and A5 analog inputs are needed for the 2 wire LCD control and that leaves 4 analog inputs, too few.
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How it works – I wanted to accommodate 6 batteries. When you connect a battery the voltage is sensed in the Read_Show_Volts function and that battery is added to the charging cycle. The 2nd and up can then be connected in any order. The first battery must be hooked up to the number 1 spot – that connection is tied to the voltage regulator that powers the Arduino and other electronics. This version is setup for up to 6 batteries with auto sensing. So here I present the details on what I ended up with. I took one of my Arduinos and wrote a program that does just that – and then I got carried away and added a few extra features. So the idea comes to my – why couldn’t I hook it up to each battery a few hours a day – wouldn’t that work? Then if I could have it automatically switch between them? While thinking about this I thought I get one for each battery, put it on, it brings the batteries to a level and then it just monitors and trickle charges it for the rest of the time. Well I’d have to get 5 battery minders – $150 if I go for the HF one on sale. And then if we go away in the winter we leave one of the cars here so there’s another battery.
#SMART TIMER CHARGER BATTERY CHARGER GENERATOR#
Were I got hung up was I have my 1975 MGB (with a 3.5 liter Oldsmobile V8), a 1981 Toyota pickup, a boat and a generator – all with 12 volt batteries. They work very well – Harbor Freight has one for $39 – of course $29 on sale which is almost always. A better choice would be one of the smart chargers – they usually have regular higher/faster charge and a snow or trickle charge that adjusts it’s output based on the battery voltage and condition. The cheap simple ones are under $15 – but they are simple – no battery feed back or monitoring, they just put just over 13 volts to the battery. If you have one or two it’s pretty easy – you can get a trickle charger. Living in the North East if you have an older car or a boat, or lawn mower or other vehicle that starts with a battery that you don’t drive or use in bad weather (some call it winter) you have to decide what to do with the batteries each season.