Hi everybody!
I am using arduino uno. I have read methods about making voltager tester but once I need test voltage, I must connnect battery to Arduino, at least using atmel chip which is very expensive.
I want to make a project that test voltage, display voltage in reading, and auto shutdown when voltage below threshole (I'm using three li-ion cells in series so it will shutdown when below 10 v)
In addition, I need more than one like this because i have many li-ion cells. Meanwhile, Atmel chip is expensive for me and it is not vital to using it.
So anyone can help me finding a chip that cheap and proper.
If can, please show me the method to make it (types of chip, how to program by arduino, show me circuit diagram)
Thanks in advance!
PERHAPS YOU SHOULD LOOK ON THE NO-ATMEL-CHIP FORUM
sorry for shouting.
How cheap do you want it to be?
...R
Google "comparator with voltage reference"
But...if you need to display the voltage then you may need a microcontroller, eg. ATtiny85.
Ok. Atmel chip on arduino uno is very complex. If we use it just for measuring volatege, displaying 7-segment leds and triggering alarm, it is so waste to do that. So I wanna a chip that have enough function(no excessive)
About price: If we bought Atmel 328 chip, we must spend about 5 dollars or something like that. I am a student in Vietnam. So this is a big number for me.
In addition, I wanna make more project !!! so the less price is, the better!
why not use a meter that reads voltage directly ?
there are meters that have all the smarts on-board, all you connect is 2 wires.
also, you could use a different chip. an ATTINY84, maybe ?
do you need to see the voltage displayed in numbers ? or can this be something like 3 LED's over 9.9 volts, turns on red LED over 10.1 volts, turns on yellow, over 10.4 volts, turns on green ?
you might be able to hard wire LED's and just push a button to test, let go of the button and it is would be in sleep mode.
Khanhdautroc:
Ok. Atmel chip on arduino uno is very complex. If we use it just for measuring volatege, displaying 7-segment leds and triggering alarm, it is so waste to do that.
Does that matter?
Khanhdautroc:
So I wanna a chip that have enough function(no excessive)
About price: If we bought Atmel 328 chip, we must spend about 5 dollars or something like that. I am a student in Vietnam. So this is a big number for me.
In addition, I wanna make more project !!! so the less price is, the better!
You can buy Pro-Minis on eBay for half of that (with shipping included). It's ATMega328 at 16MHz.
This has nothing to do with Atmel microcontroller chips.
To indicate voltage, you need a voltmeter.
To shutdown when the voltage is too low, you need a shutdown chip or circuit. I don't have one in mind, but someone else may.
Since the voltmeter would go after the shutdown circuit, you probably want a manual button to allow you to briefly read the voltage when it is in fact, shut down.
Maybe something like this:
Erni:
Maybe something like this.
And inexpensive to boot!