The project of creating a ferromagnetic display with a density of 8x18 pixels. On the basis of which the clock will be built. Basic requirements: thickness no more than 5 cm, maximum power consumption in clock mode no more than 80 watts. Remote control. The project is under development of the mechanical part.
Details
Control boards and power board.
Files
MagneticControl (01.10.2022 12-18-00).zip
The design of the controller board for controlling the power section. Project created in Altium Designer 20.2.7
We managed to collect the first number. Unfortunately, there was not enough liquid for the rest of the numbers. A volume of 20 ml is enough for only one segment. At the same time, it is difficult to lift the remaining liquid from the bottom, so more than 20 ml is needed. That would remain a sufficiently high layer of magnetic fluid. Current consumption is about 2 amps per digit at 100% PWM. In the following experiments, I will try to reduce power consumption by reducing the PWM to 50% when hitting the drop in place, since it takes less power to hold the drop than to lift it.