The RDM Responder has built-in support for the following sensors :
BH1750
Digital 16bit Serial Output Type Ambient Light Sensor IC
http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1721fvc-e.pdf
Type : E120_SENS_ILLUMINANCE
HTU21D
Digital Relative Humidity sensor with Temperature output
https://cdn-shop.adafruit.com/datasheets/1899_HTU21D.pdf
Types: E120_SENS_HUMIDITY, E120_SENS_TEMPERATURE
INA219
Zerø-Drift,Bi-Directional CURRENT/POWER MONITOR with I2C™ Interface
https://cdn-shop.adafruit.com/datasheets/ina219.pdf
Types: E120_SENS_CURRENT, E120_SENS_POWER, E120_SENS_VOLTAGE
MCP9808
±0.5°C Maximum Accuracy Digital Temperature Sensor
https://cdn-shop.adafruit.com/datasheets/MCP9808.pdf
Type: E120_SENS_TEMPERATURE
SI7021
I2C HUMIDITY AND TEMPERATURE SENSOR
Types: E120_SENS_HUMIDITY, E120_SENS_TEMPERATURE