lcd power

[liudengyuan]

Hello everyone! My machine power supply 12v. I would like to use positive and negative 5v power supply to the op amp power supply, 5v to the microcontroller and 12864 display power supply, I found a problem, the level of convergence on the issue, the power supply is the op amp gnd, but the microcontroller to detect the op amp output voltage, At the same time the display to display the power supply voltage, ask who has the means to achieve level connection no problem, thank you

[homefire]

Not enough into . Would help if you told us or posted the Circuit in question.