These encoders are cheap and reliable, with 24 steps per rotation and a nice tactile push feeling. For my input panel board, I use the Bourns PEC12R-4220F-S0024 rotary encoder. The rotary encoder has to be placed with its axis in the middle of the opening for the knob.
While the front panel is designed for 5mm LEDs, it will also work with 3mm LEDs and even with SMD LEDs in various package sizes.
If you create a design from scratch, make sure you set the zero point of the rotary encoder footprint to the center of the axis.įor the LEDs, the location should be the centre of the lens. These slightly larger holes will give some wiggle room for fine adjustments or in case the threads aren’t perfectly centred in the front panel.įor the rotary encoder, the location marks the center of the axis of the component. For the M3 screws, I recommend 3.5mm diameter holes. You can see all locations and distances in the design above. The locations for the screws, rotary encoder and LED follow a simple layout. If you design your own board, but use the standard front, you have to place the screw holes, rotary encoder and the LEDs at the right locations. Either you make sure your board is well attached to the front panel, or alternatively you provide supports, like grooves to hold the board in place. There are not only forces to the sides while the user rotates the knob, there is an especially high force if the knob is pressed. You need a rigid construction like this for a rotary encoder. These screws press the board to the plastic of the front panel, which creates a rigid construction to hold the rotary encoder at the right spot. It has four screw holes for M3 screws to fasten it to the front panel. The rotary encoder and the four LEDs are installed using a single board. I assume, you already installed the LCD display in the front panel and it is ready for use. In this part, we focus on the last two elements and how they are installed in the front panel. Four LEDs as a simple and visual status display.A rotary encoder with push function for any user input.
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