STMicroelectronics : New reference design demonstrates a wireless STEVAL-IDS002V1 sensor node powered by light


STEVAL-IDS002V1: two PV modules mounted on top of board

With the STEVAL-IDS002V1, STMicroelectronics has created a complete, fully configurable reference design for a wireless sensor node powered by a Photovoltaic (PV) module.

The STEVAL-IDS002V1 is made up of a transmitter board which contains the SPIRIT1, an ST transceiver which operates at frequency ranges below 1GHz, and an STM32L151 low-power microcontroller which controls the configuration of the sensors and data communication.

On the same transmitter board, sensing functions are performed by:
• a digital temperature sensor, the STTS751
• the LPS331AP air-pressure sensor
• a three-axis MEMS accelerometer, the LIS3DH

All three sensors are connected to the STM32L151 via an I2C bus. The board’s power supply is provided by the SPV1050, an energy-harvesting power-management unit which charges the on-board battery and regulates the voltage feed to the entire sensor node.

The system has a receiver companion powered through a USB cable by a PC. The reference design kit is supported by a user-friendly GUI, which can display:
• the electrical characteristics of the PV module and battery
• the conversion efficiency
• the current flow from the PV module to the battery
• the accuracy of the Maximum Power Point Tracking (MPPT) algorithm implemented by the SPV1050 readings from the sensors.


  • MPPT programmable by external resistor configuration
  • Battery over-voltage and under-voltage protection
  • Battery Connected and Battery Charging indication pins
  • Two embedded LDOs


  • IoT devices
  • Wearable devices
  • Fitness monitoring equipment


ST’s SPV1050


Orderable Part Number: STEVAL-IDS002V1