| Electronics > Projects, Designs, and Technical Stuff |
| Battery Tester |
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| thm_w:
--- Quote from: ColdKeyboard on November 24, 2018, 11:05:07 pm ---Wow, that's really exhaustive review or LiitoKala. Awesome job! So if I wanted to measure these ranges, would dynamically switching the sense resistor work? For example if I have three sense resistors in series, 1K, 100R and 1R, I could short 1K and 100R if I'm measuring higher currents and use 1K for low current and so on. Would this work? Does anyone have a suggestion on how to build the circuit so that the switch's resistance doesn't affect the reading too much? Also would there be any significant benefit from using a dedicated ADC vs. using the one that is built in the MCU? Which one would give me the best accuracy? --- End quote --- User Lygte on this forum, not me, I wouldn't have the patience. Yes thats right about switching resistance. You could calibrate out the switch resistance, or measure it roughly and have software compensate. I think Dave had a video about the 121GW low burden circuit, can't seem to find it at the moment. Dedicated ADC will give you better accuracy, at the cost of space, complexity, $, etc. |
| spec:
Attached is a concept schematic for a battery tester, intended to meet your stated requirements. It provides both battery charging and and discharging and monitoring of the battery under test (BUT) terminal voltage and charge and discharge currents. There are five current ranges: 100uA,1mA, 10mA, 100mA, 1A. More current ranges can be added if required Every circuit function is controlled by the MCU, so it would be good fun writing the firmware >:D. |
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