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I can reprogram the bootloader on only 1 of the 5 chips. The other 4 are still refusing with an internal/external clock.
When I successfully burn the bootloader on the chip that is working and pull it out of the socket and put any other chip in its place...same atmega328p-pu chips....same...
Hi,
I bought some atmega328p-pu chips a few months ago and was able to successfully burn the bootloader on all of them. But now the sketches are failing to upload on the chips and I am also not able to burn fresh bootloaders on the chips using Arduino as an ISP (although previously I did)...
This is to balance them while they are charging....instead of cutting off the string, I want to bleed the cell which reaches 4.2V to the level of the cell with the 2nd highest voltage and then open the switch...In this way, all of the cells would be charged to 4.2V at the end of the charge cycle.
Hi,
I am designing a Li-Ion pack and was wondering....would I have to use those 5W resistors for bleeding the cells as they are quite big in size for a PCB...I am using 5W resistors because maximum voltage of a single cell can be 4.2V and I need atleast 550mA bleeding speed. 2W resistors won't...
Hi Kluas,
It is finally working... I used INA105 (precision difference amps) with a unity gain and got results accurate upto 2 significant digits after the decimal place....I also added a mux and a demux to increase the i/o pins of the atmega328p...and now it is time to design the PCB. Thanks...
* I am using an Arduino Uno, it has a 1.1V internal ref available, the other one is Mega2560 with 2.56V internal ref
* Actually, I am working on developing a 7S2P Li-Ion pack...I have attached a simple schematic of only the voltage measurement ckt...I will be using the Arduino Mega in the...
I need to monitor voltages of Li-Ion cells stacked in series and appropriately operate protection circuitry using Arduino.
1. First I ran into the problem of using <10kOhm resistors for a voltage divider as per the ATmega328 datasheet because when I tried to use large value resistors the...
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