Low Current Measurement System For Wireless Sensor Nodes

In this article, we present a successfully designed and tested system for measuring low currents from wireless sensor nodes. In the last few years, IoT devices have multiplied their number and functionality. These devices are located all over the world, and batteries are their main source of energy. It is extremely important to reduce the energy consumed by the sensor nodes in order to prolong the life of the batteries. Measuring the current consumed by wireless sensor nodes is a process that is of great importance to engineers and designers in terms of reducing the energy consumed by the batteries of the sensor units. Wireless sensor nodes consist of many elements such as sensors, transmitters and microcontrollers. All of them consume different amounts of energy during each operation performed by the sensor node - sending, measuring, falling asleep, etc. In the individual operating modes, the current consumption is very small, reaching nano amperes. This is one of the main problems in measuring the current consumed by the sensor nodes. The devices for measuring the energy consumed by the wireless sensor units are very expensive, which leads to their limited use. This requires the design and implementation of low current measurement systems to be used in the training of engineers and designers.