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The long range 169 Mhz standard toolkit consists of a set of transmitters plus a receiver.

temperature and humidity sensors

The temperature and humidity Enless sensors - TX TEMP HUM AMB 700-022 - embed a SHT21 manufactured by Sensirion

Enless TRH circuit

SHT21 datasheet

  • L2 and L3 (on the transmitter) remain lit for 1 minute if radio quality is good
  • L1, L2 and L3 (on the transmitter) remain lit for 1 minute if radio communication quality is poor.
  • With a repeater, you can have L2 and L3 blinking on the transmitter, even though the data packet is correctly repeated

temperature, humidity and CO2 Sensors

2 modes : calibration and communication

When powered, the sensor can be either in calibration or communication mode

mode sequence
calibration L1,L2,L3 blinks successively
then remain all lit for one minute
communication L1,L2,L3 blink successively
L1 blink each 2 second
L3 remain lit if radio quality is good

If you are in calibration mode and want to enter communication mode (or vice versa), just power off the sensor for one-minute and power on.

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