Real-Time Wireless Position and Angle Measurement System for IoT and Vehicle Telemetry

The article describes a system of wireless measurements that can be used in the IoT or vehicle telemetry. Today, IoT systems are everywhere. The sensors of these systems collect various data. Then, all data must be sent to the main unit that can use them for diagnostic purposes or for control. Data should be sent as fast as possible. It would be best if the data were sent in real time. The same situation is in the vehicle telemetry system, especially for autonomous vehicles. This task may be performed using a small reflective absolute encoder with an embedded system based on the popular ESP32 chip. The document presents the initial phase of testing of the wireless data acquisition system. The study was motivated by the desire to build a system capable of real-time data transmission that was as compact as possible and based on widely available and low-cost components. To this end, the focus was placed on a relatively new solution: the Espressif-developed ESP-NOW protocol. During the tests, several important aspects were examined from the perspective of the telemetry system. One of them was the maximum distance between the transmitter and receiver under actual operating conditions. Subsequent aspects were the power consumption depending on the configured transmitter power, time required to complete a work cycle, and the time between sending a message and receiving a reply.