YO Thermostat

Overview

Description

The YO Thermostat is an advanced device designed to monitor and regulate indoor conditions with precision. It measures temperature, humidity, illuminance, and optional CO2 levels while providing occupancy tracking through an infrared presence sensor with a built-in counter. Equipped with a PID controller, the thermostat ensures consistent temperature regulation by comparing room temperature to a setpoint and fine-tuning its state accordingly. The controller’s output is transmitted via LoRaWAN, enabling seamless integration with actuators like the YO Relay Switch for controlling HVAC systems, heaters, or other devices. Ideal for maintaining optimal indoor environments, the YO Thermostat enhances occupant comfort, productivity, and well-being. Its wireless and battery-operated design ensures easy installation and flexibility in various applications.

Figure 1. Device top view

Device sticker placed on the right side of the device enclosure contains information about model, version, LoRaWAN region and 3 parameters important in case of device identification and configuration:

DEV EUI: 64-bit unique device identifier in a LoRaWAN network,
DEV ADDR: address required to connect via ABP activation type to LoRaWAN,
BLE MAC: Bluetooth physical address.

Figure 2. Device sticker

Features

LoRaWAN Technology: Available in multiple versions with LoRa radio configured for various regions and ISM frequency bands (e.g., EU868, US915, AU915), it is compatible with both private and public LoRaWAN networks and supports connections via ABP (Activation by Personalization) or OTAA (Over-The-Air Activation).
Bluetooth Low Energy (BLE): Enables easy configuration through a user-friendly JSON data exchange format, supports firmware updates via OTA (Over-the-Air), and boasts very low energy consumption.
Battery-Powered: 3x AA lithium batteries featuring very low self-discharge, ensuring long-term operation without the need for an external power supply.
Temperature and Relative Humidity: Measures temperature and relative humidity within the device enclosure, providing valuable insights into the surrounding environment.
Illuminance: Equipped with a sensor to measure light intensity, ensuring the room has adequate lighting levels.
CO2 (optional): Tracks CO2 levels to ensure a healthy indoor environment, helping to prevent reduced concentration and increased heart rate caused by elevated levels.
Infrared occupancy: Features an infrared motion sensor with a built-in occupancy counter to track the number of people entering or exiting a room.
Thermostat Output Signal Status: PID-controlled on-off output signal ensures precise and stable temperature regulation by continuously adjusting to ambient conditions.
Yosensi Management Platform: Provides a web tool for device configuration, firmware updates, and infrastructure management. Enables comprehensive monitoring of transmitted data and easy device management.
Yosensi Mobile App: Effortlessly manage devices with features to register new ones, configure settings, perform firmware updates, view/send logs, and test LoRaWAN connectivity. Learn more in our detailed Yosensi App blog post.

Specifications

Physical

Figure 3. Dimensions of the device

Device

Attribute	Description
Dimensions	Height: 25.5 mm Width: 86 mm Depth: 86 mm
Colour	White
Mounting method	Horizontal Vertical (can be screwed to the wall)
Enclosure material	ABS
Level of protection	IP40, UL94-V0
Weight	82.5 g (without batteries)

Operating Conditions

°C°F

Attribute	Description
Temperature	0°C to 70°C
Humidity	0 to 90%
Placement	Indoor use
Power supply	3 x LR6 (AA) battery (3 x 1.5 V)
Power consumption	Maximum: 120 mA DC (4.5 V DC)

Measured Values

°C°F

Parameter	Measurement range	Accuracy
Temperature (internal)	-40°C to 125°C	±0.2°C (5°C to 60°C)
Relative humidity (internal)	0% to 100%	±2% (20% to 80%)
CO2 (optional)	0 to 40.000 ppm	±(40 ppm+5%) from 400 ppm to 5000 ppm
CO2 (optional)	Recommended working conditions: -10°to 60 °C	±(40 ppm+5%) from 400 ppm to 5000 ppm
Illuminance	0 to 120 klx	±10% at 25°C
Infrared presence sensor	0 to 4.5 metres, 80° field of view

Controls and Indicators

LED Status Indicator

YO Thermostat communicates its current behaviour to the user by RGBW LED placed on the bottom.

Diode statuses interpretation

Behavior	Colour	Status
Single flash	Green	General: device is working correctly (power and memory).
Single flash	Red	General: device is working incorrectly (power and memory). LoRaWAN communication: failed to receive an acknowledgement from LoRaWAN Server within specified timeout.
Single flash	White	LoRaWAN communication: LoRaWAN frame sent / confirmation from LoRaWAN Server after receiving the frame.
Slow flashing	Blue	BLE communication: connection to the device via BLE (configuration).
Rapid flashing	Blue	LoRaWAN communication: connecting to LoRaWAN network.

Buttons

The YO Thermostat has a button for resetting the device. Figure 4 shows its placement. To reboot the device, press the reset button for a moment.

Figure 4. Reset button

Installation

Package Contents

Device (without batteries).
Warranty card.

Safety Precautions

NOTE

Go to the Safety Precautions section to see important information on handling, disposal and maintenance.

Installation Guide

To open the enclosure, pry off the lower part.

Figure 5. Device opening instructions

Place three LR6 batteries in the device according to the polarity indicated on the battery holder.

Figure 6. Device with placed batteries

There are two ways to mount the device on a wall.
- A. Install the bottom part of the enclosure and mount four screws in each corner to the wall.
  Figure 7. Mounting the device using four screws
- B. Fit two mounting screws into the centre of the bottom case. Then, angle the bottom of the enclosure and turn it clockwise.
  Figure 8. Mounting the device using two screws at an angle
  
  Figure 9. Mounting the device using two screws after a clockwise turn
Place the upper part of the device enclosure on the bottom part mounted on a wall.

Figure 10. Placing device on the wall

Configuration

Configurable Parameters

A few parameters must be set before sending data to the gateway. The default firmware is configured in OTAA mode with predefined deveui, appkey (OTAA) and appskey, nwkskey (ABP).

Configuration of the device is stored in a JSON file divided into the following sections:

info (generic, read only): information about the device,
lorawan (generic): configuration data for LoRaWAN connection,
ble (generic): Bluetooth settings,
device (dynamic): individual configuration for a specific device (this section’s structure differs for each device),

Sample configuration file for the YO Thermostat device.

{
	"info": {
		"devmodel": "LNTS",
		"fwver": "1.0.0",
		"loraradio": "SX1261",
		"lorawanver": "1.0.2",
		"loraregion": "EU868",
		"blemacaddr": "0123456789ab"
	},
	"lorawan": {
		"subband": 1,
		"nwktype": "public",
		"acttype": "otaa",
		"otaa": {
			"deveui": "0123456789abcdef",
			"appeui": "fedcba9876543210",
			"appkey": "000102030405060708090a0b0c0d0e0f",
			"trials": 3
		},
		"abp": {
			"devaddr": "01234567",
			"nwkskey": "0123456789abcdef0123456789abcdef",
			"appskey": "000102030405060708090a0b0c0d0e0f"
	}
	},
	"ble": {
		"power": 0,
		"interval": 1600
	},
	"device": {
		"tempoffset": 0,
		"thermostat": {
			"regkd": 0.5,
			"regki": 2,
			"regkp": 5,
			"cycletime": 900,
			"economyoffset": -4,
			"standbyoffset": -2,
			"comfortsetpoint": 21,
			"computinginterval": 60,
			"frostprotsetpoint": 7,
			"oprmodeafterreset": 5
		},
		"co2calibval": 0,
		"measinterval": 3600,
		"illuminancecoeff": 1.6
	}
}

OTAA & ABP

OTAA	ABP
Device EUI	Device Address
Application EUI	Network Session Key
Application Key	Application Session Key
Number of Trials

Generic Parameters

Generic Parameters for Yosensi Devices.

Click here to see the generic parameters for Yosensi devices.

Parameters

Device Parameters

Name	Description	Possible Values	Default Value	Read/Write
measinterval	Measuring and sending interval LoRa [s]	60¹-999999	3600	R/W
co2calibval	Calibration value of CO2 sensor [ppm]	0-9999	0	R/W
tempoffset	Temperature offset in [°C]	-20.0-20.0	0	R/W
iluminancecoeff	Illuminance coefficient	0.0-10.0	1.6	R/W
comfortsetpoint	Comfort set point	7.0-40.0	21.0	R/W
standbyoffset	Standby offset	-0.1-(-8.0)	-2.0	R/W
economyoffset	Economy offset	-0.1-(-10.0)	-4.0	R/W
frostprotsetpoint	Frost protection set point	7.0-40.0	7.0	R/W
opermodeafterreset	Operating mode after reset	0, 1, 2, 3, 4, 5	5	R/W
cycletime	Cycle time [s]	600-9999	900	R/W
computinginterval	Computing interval	1-300	60	R/W
regkp	Regulator proportional gain	1-8	5.0	R/W
regki	Regulator integral gain	0-6	2.0	R/W
regkd	Regulator derivative gain	0-4	0.5	R/W
OTAA minimum 60 [s], ABP minimum 120 [s]

Parameters description

nwktype: used for setting the device in public or private network type.
acttype: used for setting the device in ABP or OTAA mode.
deveui, … , appskey: predefined addresses and keys, these parameters are generated using multiple IDs specific to the particular MCU and are unique for each device. They can be changed if needed.
interval: determines the interval of sending broadcast packets, used to connect to every BLE receiver around the device.
subband: used for setting the communication frequency sub-band in LoRaWAN.
measinterval: measurement interval [s] between sending LoRa packets.
co2calibval: Calibration value of the CO2 sensor, providing high initial and long-term accuracy. Enables the sensor to restore optimal accuracy using a CO2 reference value, used if measurement stability deviates. A value of 0 disables calibration.
tempoffset: Offset value applied to temperature measurements for adjustments.
illuminancecoeff: Parameter that tunes the illumination intensity sensor to account for light beam attenuation through the optical fiber. This parameter is predefined.
comfortsetpoint: Target room temperature maintained by the thermostat for optimal comfort.
standbyoffset: Determines how many degrees the comfort set point temperature shifts when standby mode is active. For example, with a comfort set point of 21.0°C and a standby offset of -2.0°C, the new comfort set point temperature is 19.0°C.
economyoffset: Determines how many degrees the comfort set point temperature shifts when economy mode is active. For example, with a comfort set point of 21.0°C and an economy offset of -4.0°C, the new comfort set point temperature is 17.0°C.
frostprotsetpoint: Temperature set point when frost protection mode is activated.
opermodeafterreset: Operating mode after reset, with six modes corresponding to different temperature control parameters:
- Value 0: Disable thermostat feature.
- Value 1: Activate comfort mode.
- Value 2: Activate standby mode, adjusting room temperature for energy savings.
- Value 3: Activate economy mode, adjusting temperatures during night hours or long absences.
- Value 4: Activate protection mode, maintaining critical temperatures under specific conditions.
- Value 5: Restore the mode active before reset.
cycletime: Time interval between changes in the controller output state.
computinginterval: Interval for PID regulator computations, preventing temperature overshoot or oscillation.
regkp: Proportional gain of the relay switch, predefined.
regki: Integral gain of the relay switch, predefined.
regkd: Derivative gain of the relay switch, predefined.

Downlink message

You can remotely adjust certain parameters by sending a downlink message through our platform. Simply navigate to the "COMMANDS" section for the selected device.

Update Measurement Interval

It is possible to change the measurement interval (measinterval) by using downlink. Information about changing the parameter will be sent from the server via the gateway.