In some examples, an electronic device includes a printed circuit board. In some examples, the printed circuit board includes a conductive base layer. In some examples, the conductive base layer is an electrode to produce a signal indicative of a change in an omnidirectional electrostatic field corresponding to a moving object. In some examples, the printed circuit board includes a via coupled to the conductive base layer. In some examples, the via is disposed through an intermediate layer of the printed circuit board. In some examples, the printed circuit board includes an integrated circuit coupled to the via. In some examples, the integrated circuit is to detect, using a machine learning model, a direction of the moving object in the omnidirectional electrostatic field based on a feature of the signal.