Refine summary

README.md

@@ -1,6 +1,6 @@
 # Summary
 
-This project consists of simple Atmel ATmega328P based nodes utilizing HopeRF LoRa RFM95W/RFM96W radios. Sensors supported by battery-powered nodes are Silicon Labs Si7021 for temperature and humidity, Bosch Sensortech BME280 for temperature, humidity and barometric pressure, and common NTC thermistor for temperature only. Externally powered pulse type nodes count pulses from different utility meters and also connect to Kamstrup Multical energy meters. Gateway receives and collects measurements from sensor nodes and can be accessed by serial communication using Modbus RTU protocol via either two-wire RS-485 or common 3.3 volt UART. This enables interfacing with many DIY home automation systems such as [Domoticz](https://www.domoticz.com/), [Home Assistant](https://www.home-assistant.io/) and [openHAB](https://www.openhab.org/). Sensors uses custom circuit boards but is programmed with Arduino IDE.
+This project consists of simple Atmel ATmega328P based nodes utilizing HopeRF LoRa RFM95W/RFM96W radios. Battery-powered nodes measure temperature, humidity and barometric pressure, depending on connected hardware. Externally powered pulse type nodes count pulses from different utility meters and also connect to Kamstrup Multical energy meters. Gateway receives and collects these measurements from the sensor nodes and can be accessed by serial communication using Modbus RTU protocol via either two-wire RS-485 or common 3.3 volt UART. This enables interfacing with many DIY home automation systems such as [Domoticz](https://www.domoticz.com/), [Home Assistant](https://www.home-assistant.io/) and [openHAB](https://www.openhab.org/). Sensors uses custom circuit boards but is programmed with Arduino IDE.
 
 <p align="center"><img src="images/sensors_topology.svg" width="90%" /></p>