Hi,
I have a question about 7 segment LCDs. I'm trying to improve a weighing scale and reuse the load cell, LCD and case. The initial device was supplied by two AAA batteries, I have a boost converter on my board and I boost the 3V to 5V. I'm using a PIC16F917 and a HX711 load cell ADC.
The question is, are the LCDs built for a specific voltage? At this moment my code can display something on the LCD but depending on the supply voltage, I get lots of ghosting or not. AT 5V, the intended supply voltage, everything is turned on regardless of the LCD registers. At 3V, it works well. The ghosting starts after 3.1 - 3.2V.
The LMUX is 1/4, the bias is 1/3.
I wonder if a resistor between VDD and LCD Bias 3 to reduce the Bias 3 voltage to about 3V would help.
Thanks,
Miti