1 Introduction

In some application scenarios of capacitive touch, the customer might not want to use capacitive touch to detect whether the button is pressed, but instead they want to use the principle of capacitive touch to detect the depth of a liquid, such as the depth of the humidifier water tank or a vacuum robot water tank. To meet the needs of customers, this paper designs a liquid level detection system based on the MSP430FR2533 capacitive touch MCU, which can be simple, convenient and flexible for liquid depth measurement, and at the same time can achieve high accuracy water level measurement and low system cost. Figure 1-1 is a simplified schematic diagram of the liquid level detection system.

Figure 1-1 Simplified Schematic of Liquid Level Detection System