This document discusses the energy-efficient operation of an infrared sensor node that detects rodents and transmits data via GSM to support precision agriculture. It describes the AgroDat.hu project which establishes an agricultural decision support system using sensor data. Prototypes of soil and camera sensors are presented, with a focus on developing intelligent camera sensors that can process images locally to only transmit relevant data. Various architectures are evaluated to balance the energy use of on-sensor processing versus transmission. The findings suggest using low-power microcontrollers for sensor control and communication to minimize idle power consumption and enable energy savings through local processing and triggered transmission.