Implementation of Wired and IoT Based Wireless Transmitters for a Pressure Sensor

In this paper, a wired and wireless transmitter for two different designs of hall effect-based pressure sensors are designed and experimentally tested. A wired transmitter is designed by converting the actual sensor output to a 1-5V range using a signal conditioning circuit, followed by a voltage-to-current (V-I) converter to convert the signal conditioning circuit output to a 4-20 mA current signal which can be transmitted to any remote indicator without any data loss. A wireless transmitter is also designed with the same signal conditioning circuit and a Wi-Fi module to transmit the pressure sensor data wirelessly to the IoT cloud server. The Blynk IoT console is used as a server to access the transmitted data through a PC/laptop connected to the Internet. The linearity as % deviation and % error of the V-I converter is calculated for wired transmission and the mismatch between transmitted and received data is also found for the wireless transmission for both sensor designs. The proposed transmitters are of low cost, and simple in design, and the pressure sensor data can be transmitted in real-time using both wired and wireless modes.