I want to make a circuit for my machine. Where i want to charge my 12v 9amp battery via 12v charger i want to show battery voltage in a form of graph on the LCD. Moreover, i want to show that if the battery voltage is less than 8v it should show "charge the machine" on the LCD and when the battery is full it should show "battery is full". Can anyone help with the circuit?
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Do you mean 9Ah?
A = Amperes = current
Ah = Amp-hours = capacity
When charging any battery, it's important to know the chemistry of the battery because that changes the charging strategy that's needed.
Is your battery SLA (Sealed Lead-Acid)?
A 16x2 LCD is characters only, not graphics. Consider a graphic LCD like 128x64 ST7920 or maybe an OLED?
Yes 9Ah, and it is lead acid battery
You can make graphs with special characters. A bar graph is common.
Just saying
Yes, I can do that but im confused with the circuit.
LCD is not the prob the prob is that im not sure how to make a circuit. I have used a voltage sensor module but it's not what I want. The thing is that when the supply is giving 13.6V to the battery upon being turned on. What I want to do is make a circuit where I can make sure that when the supply is turned on it shouldn't supply any voltage to the Arduino and when the voltage level is 12.6(full battery) then it should show it on LCD. When it is 8.6V (low battery) it should be shown on the LCD. The main problem is that 13.6V of the supply will be sensed by the voltage sensor module, I don't want that.
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True, yes.
I was not thinking of that as a graph, perhaps because it's 1-dimensional. I was thinking of a 2-dimensional graph like voltage against time for example.
You need to sense the current and the voltage.
When the current drops below say 100mA then you know that the battery is charged.
You can use an ACS712 module to measure the current
Confusing. So the Arduino will be off while the battery is charging?
That's a great idea! I can try it out, but how can I code it?
Yes it will be.
Do you know anything about writing code for the Arduino?
Yes i can map it.
Then start here
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You'll ruin your battery if you allow it to discharge to 11V. Read
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