With the improvement of living standards, the demand for intelligent furniture has gradually emerged, and the application of data collection such as temperature and humidity has begun to show increasing market potential. In this paper, Silica Labs' Si7001 temperature and humidity sensor, C8051F985 low-power MCU, CP2403 LCD driver, and LCD display are used to build a system for temperature and humidity data collection in the home. This system is mainly used for convenient and timely access to indoors. And external temperature, humidity and other data (can also be integrated with other sensors to expand the range of data acquisition applications).
â—How the home data collection system works
The Si7001 temperature and humidity sensor used in this article, C8051F985 low-power processor, CP2403 LCD driver, all have I2C communication interface, can be made into modules, only need to use their own LCD display.
Typical applications are as follows:
Two Si7001 temperature and humidity sensors (hereinafter referred to as acquisition nodes) are placed indoors and outdoors, and the temperature and humidity raw data are periodically awakened, and processed by the AD7001 internal AD converter and the factory-calibrated raw data to be converted into temperature and humidity final data. It is passed to the low-power processor C8051F985 for processing via the I2C bus. The C8051F985 low-power processor determines which acquisition node is enabled to reduce power consumption and control the CP2403 LCD driver to ultimately display the data on the LCD display.
â—The performance of the home data acquisition system
- Power consumption of each node
1Si7001 power consumption
The typical current during the humidity measurement period of the Si7001 is 240μA. The typical current during the temperature measurement period is 320μA, the sleep current is 0.2uA, and the average power consumption per minute for temperature and humidity measurement is only 1μA.
2C8051F985 power consumption
C8051F985 sleep current 10nA, working current 150uA/MHz
3CP2403 power consumption.
Sleep current 0.02μA, operating current <3μA. It is measured once every minute and the operating frequency is 4MHz. The average power consumption is no more than 15μA, which is very suitable for battery power supply.
- Data collection range
The Si7001 has a temperature measurement range of -40 to 85 ° C and an accuracy of ± 0.5 ° C at 25 ° C. The recommended humidity measurement range is 5 to 90% RH, and the accuracy is 2 to 3% RH at 20% to 80% RH.
Take the home application as an example: a data acquisition node can be arranged outdoors for monitoring outdoor temperature and humidity; two nodes are arranged in the indoor living room and bedroom for indoor temperature and humidity measurement and automatic adjustment.
- scalability
The home data collection system generally includes: smoke sensor, fire alarm, burglar alarm, etc. Through the universal I2C bus, using a more powerful processor, integration and expansion with other sensors can be realized, which facilitates layout and reduces costs. .
â— Features of the Si7001:
The Si7001/2 is a digital relative humidity and temperature sensor. Integrated ADC, signal processing, data calibration, I2C interface in one.
The Si7001/2 is factory calibrated for temperature and humidity, and the calibration data is stored in the NVM, eliminating the need for software calibration and changes. The patented industry standard CMOS low-k dielectric sensor ensures good long-term stability, low distortion and delay for contaminants.
The Si7001/2's low power consumption, high accuracy, calibrated and stable performance are ideal for a wide range of applications including temperature, humidity and dew point. Suitable for high precision medical, instrumentation, high reliability automotive and industrial systems, environmental sensors, price sensitive white goods, etc.
to sum up
The above briefly describes the use of SI7001 temperature and humidity sensor, C8051F985 low-power MCU processor, CP2403 LCD controller, LCD display, etc. to form a home data acquisition node and display control system, with low power consumption, easy to use (battery-powered), scalable Other advantages, it is very suitable for environmental parameters monitoring in home, warehouse, ward and other applications.
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