This device tests up to seven lithium cells. It measures cells in two modes:
* Mode 1: 'Dynamic' - This mode displays cell voltages together with a bar chart to make any imbalance easy to spot. It would typically be used when the pack is at rest but could be used to show changing voltages because the refresh rate is rapid.
* Mode 2: 'Recording' - The voltages of each cell are measured and logged 103 times over a 4+ second period. You would typically use this while applying a load (eg: your plane's motor). It then graphs these voltages, all together or one cell at a time. This allows you to identify weak cells after the test and whether your motor's load is pulling the pack's voltage too low.
This is v2 which is an evolution of the LED-based v1. v2 uses Microchip's 28 pin PIC18F2523 chip with its 12bit ADC. It uses the KS0108/KS0107-based JE-AN 128x64 graphical LCD. I have designed but not built 'v3' which will look identical but include FETs and plug-in resistors to also function as a balancer.
The source code may be available on request for non-commercial use. I will require you to commit clearly to personal use only and to not share, distribute or post the source code elsewhere. It comprises over 1,700 lines and compiles to over 9,000 words with font/image libraries. It is written in C for the BoostC compiler; a licenced version is required due to the program's size.
PIC Projects | | | Beginners Guide |
Back
Click on the links below for other pages.
Home ¦
Art of the Possible ¦
Absence of Matter ¦
Links ¦
Updates ¦
Email
SITE MAP