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Wiring diagram of battery monitor |
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Increase ADC resolution for the voltage range of interest |
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A function mapping Uin to Uout |
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Basic differential amplifier circuit |
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Differential amplifier circuit modified for the application |
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Calibration setup |
Battery [V] | ADC Value | |
---|---|---|
11.0 | 7 | 0x07 |
12.0 | 65 | 0x41 |
12.8 | 115 | 0x73 |
15.0 | 248 | 0xF8 |
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Voltage to ADC curve |
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Circuit board (some capacitors soldered at back side) |
Version | Date | Change |
---|---|---|
1.0.0 | 2012-07-06 | Initial version. |
1.1.0 | 2012-07-21 | Some minor corrections. |
1.2.0 | 2012-09-06 | Now using libAvrUtils 1.2.0. |
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Operationsverstärker Grundschaltungen | Article (german) on operational amplifiers on mikrocontroller.net. |
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http://www.mikrocontroller.net/ | A great (german) resource of Atmel AVR tutorials and general microcontroller know how. |
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RoboterNETZ | Another great (german) resource of microcontroller know how. |
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AVR freaks | English speakers should visit this website. |
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CrossPack | CrossPack for AVR Development for Mac OS X. |
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AVR-GCC-Tutorial | German avr-gcc tutorial from mikrocontroller.net. |
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http://www.nongnu.org/avr-libc/ | The AVR C library (for use with avr-gcc). |
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http://www.nongnu.org/avrdude/ | AVRDUDE, a tool for flashing AVRs. |
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http://www.cadsoft.de/ | EAGLE a CAD software for designing circuits. Free version available for Mac OS X, Linux and Windows. |
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RS-232 product site | MAXIM's website featuring their line of RS-232 transceivers. The most current datasheet can be downloaded from there. |
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LM358 product site | Texas Instruments's website featuring the LM358 operational amplifier. The most current datasheet can be downloaded from there. |
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ATmega8 product site | Atmel's website featuring ATmega8. The most current datasheet can be downloaded from there. |
The information on this web site and the documents downloadable from here have been
carefully reviewed and is believed to be reliable, but I do not assume any liability
arising out of the application or use of any documents, programs or circuit described
herein.
Furthermore I want to declare that I'm not responsible in any way for the content of other
web pages, books and other sources I'm refering to.