Expand the tx and rx pins of ESP-01S to drive INA226 and 0.91-inch OLED (IIC version). INA226 uses hardware IIC, and OLED uses U8G2 software to simulate IIC. The power chip is MP1584EN, the maximum input voltage is 30v, and the sampling resistor is 10mΩ, the maximum current is 8A. Developed based on Arduino IDE, the attachment is the library file and software code. Because the code is relatively simple, no comments are added. You can modify the USB interface to your liking, but I mostly use idle materials.
The last PCB recommended board thickness is 1.2mm, which is exactly the height of the screen. The screen can be embedded in the PCB, but the slotted edge on the right side of the PCB needs to be cut with a slope using a blade, otherwise it will squeeze the screen's cables, so remember! ! !
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