Temperature And Humidity Sensor HTMRS03 T/H module Smart Home
insert DHT11 Stabilizes the digital T/H sensor
HTMRS03 T/H module Smart Home insert DHT11 Stabilizes the digital
T/H sensor
Product overview
This product is a temperature and humidity integrated sensor with
calibrated digital signal output. It uses high polymer humidity
sensitive resistor as sensing element and is converted into digital
signal output after collection and processing by single chip
microcomputer. It has the characteristics of long-term stability,
high reliability, high precision, low power consumption and so on.
Widely used in humidifier, dehumidifier, air purifier, new fan,
central air conditioning and other household appliances.
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Dimensional drawing
Unit: mm (±0.5mm)
Email:cherryliu@taimihk.com
Mobile/whatsApp:+86 13538467125
product feature
The new DHT11 digital temperature and humidity module has the
following features:
1, digital output, single bus protocol;
2. Low power consumption;
3, 20~95% relative humidity measurement range;
4. Universal 2.54mm connection terminal;
5, temperature drift calibration, good stability.
performance indicators
Table 1 Relative humidity
| parameter | condition | Min | typical | Max | unit |
| resolution ratio | | | 1 | | %RH |
| range ability | | 20 | | 95 | %RH |
| accuracy | 25℃ | ±5 | ±3 | ±5 | %RH |
| repeatability | | | ±0.1 | | |
| response time | 1/e(63%) | | < 8 | | S |
| slow-moving | | | ±0.5 | | %RH |
| drifting | typical value | | < 3 | | %RH/y |
Electrical specification
Table 2 Temperature
| parameter | condition | Min | typical | Max | unit |
| resolution ratio | | | 0.1 | | ℃ |
| working range | | -20 | | 60 | ℃ |
| accuracy | | | ±0.5 | | ℃ |
| repeatability | | | ±0.2 | | ℃ |
| response time | 1/e(63%) | 1 | | | S |
| slow-moving | | | ±0.1 | | |
| drifting | typical value | | < 0.2 | | ℃/y |
Table 3 Io represents low level output current and Rp represents
pull-up resistance
| parameter | condition | MIN | Typical | Max | Unit |
| Power supply voltage VDD | | 3.0 | 5 | 5.5 | V |
| sleep mode | | 0.6 | 2 | uA |
| | 2.0 | 2.5 | mA |
| sampling period | | | 2.0 | | S |
| Low output voltage | Io<4mA | 0 | | 250 | mV |
| Low output voltage | Rp<25kΩ | 80% | | 100% | VDD |
| Low input voltage | falling edge | 0% | | 20% | VDD |
| High level input voltage | rising edge | 80% | | 100% | VDD |
current output | On | | | 4 | mA |
| three-state gate(Off) | | 10 | 20 | μA |
Single bus interface definition
1,pinout
| pin | Name | description |
| 1 | VDD | power3.0~5.5V |
| 2 | SDA | Serial data, two-way port |
| 3 | NC | |
| 4 | GND | Land |
Table 1: Pin allocation
- Power pin (VDD GND)
The supply voltage of this product ranges from 3.0 V to 5.5V
1.2. Serial Data (SDA)
SDA pins have a three-state structure for reading and writing
sensor data..
2. Single bus communication
1 2 3 4
Figure 1: Pin assignment
2.1,Single bus connection
The microprocessor can be directly connected to the sensor. In
single-bus communication mode, the SDA is connected to the I/O port
of the processor after being pulled up.
Special instructions for a single bus:
1. In typical application circuit, it is recommended to use 10K
pull-up resistance when the connection length is shorter than 30
meters, and then according to the length of the use distance
Short, adjust the size of pull-up resistance.
2. The read interval must be longer than 1S. If the time interval
is too short, the temperature and humidity measurement may be
inaccurate.
Application information
1. Working conditions
The recommended temperature range is -10 ° C to 60 ° C and the
humidity range is 20-95%RH to ensure the normal and stable
operation of the sensor. Exceeding the recommended range may cause
temporary drift of measurement results.
2. Storage conditions and recovery
The humidity sensor is an environment-sensitive electronic
component and requires careful protection. Long-term exposure to
high concentrations of chemical vapors will cause the sensor's
measurements to drift. Therefore, it is recommended that the sensor
be stored in the original package and meet the storage conditions:
Temperature range 10 ° C to 50 ° C; Humidity range: 20-60%RH.
Sensors should be kept away from high concentrations of chemical
solubilizers during production and transportation. Avoid using
volatile glues, adhesive tapes, self-adhesive stickers, or volatile
packaging materials such as foam bags and styrofoam.
3. Influence of temperature
Relative humidity depends a lot on temperature. The product has
been calibrated and compensated for the temperature before leaving
the factory. When measuring humidity, the sensor should be ensured
to work at the same temperature as far as possible. When installed
on the product, it should be kept away from the heat source as far
as possible. Otherwise, the relative humidity of the gas cannot be
accurately measured.
The sensor adopts passive communication mode, and is in sleep mode
when there is no signal received, which is not only to save power
but also to better control heat. Therefore, when in use, the wake
up frequency should not be too high, otherwise it will be due to
automatic heating effect. The recommended sampling period is 2
seconds.
