I have an inexpensive in-line DC Wattmeter that I often use to measure yield from Solar Panels / Modules and other energy sources with reasonable accuracy and resolution. It has a 16x2 LCD display (1602 STN) that displays 4 values simultaneously namely: Voltage (V), Current (A), Power (W) and Energy (AH). It uses a 8MIPS uC and has a Data Queue / Sequence time of 2 secs. It is rated for 0-60V and 0-100A DC. The wattmeter is a one stop solution as opposed to multiple DMMs or very expensive Data Loggers.
I am now trying to store the values displayed (Data Logging) for various downstream uses. The whole unit is sealed with only the 16 pins of the LCD remaining exposed (and thereby exploitable). All 16 pins are in use.
Is it possible to tap into those values being passed and either:
- write them onto a SD card or
- transmit to a PC/laptop over USB for display and storage.
The efficiency or accuracy of the unit should not be compromised in the due process.