EasyManuals Logo

SunFounder ESP32 User Manual

Default Icon
771 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #750 background image
SunFounder ESP32 Starter Kit
• RN is the resistance of the NTC thermistor under the rated temperature TN. Here, the numerical value of RN is
10k.
• TK is a Kelvin temperature and the unit is K. Here, the numerical value of TK is 273.15 + degree Celsius.
• TN is a rated Kelvin temperature; the unit is K too. Here, the numerical value of TN is 273.15+25.
• And B(beta), the material constant of NTC thermistor, is also called heat sensitivity index with a numerical value
3950.
• exp is the abbreviation of exponential, and the base number e is a natural number and equals 2.7 approximately.
Convert this formula TK=1/(ln(RT/RN)/B+1/TN) to get Kelvin temperature that minus 273.15 equals degree Celsius.
This relation is an empirical formula. It is accurate only when the temperature and resistance are within the effective
range.
Example
• 5.10 Thermometer (Arduino Project)
• 8.4 IoT Communication with MQTT (Arduino Project)
• 5.10 Temperature Sensing (MicroPython Project)
• 2.6 Low Temperature Alarm (Scratch Project)
5.27 DHT11 Humiture Sensor
The digital temperature and humidity sensor DHT11 is a composite sensor that contains a calibrated digital signal
output of temperature and humidity. The technology of a dedicated digital modules collection and the temperature and
humidity sensing technology are applied to ensure that the product has high reliability and excellent long-term stability.
The sensor includes a resistive sense of wet component and an NTC temperature measurement device, and is connected
with a high-performance 8-bit microcontroller.
Only three pins are available for use: VCC, GND, and DATA. The communication process begins with the DATA line
sending start signals to DHT11, and DHT11 receives the signals and returns an answer signal. Then the host receives
the answer signal and begins to receive 40-bit humiture data (8-bit humidity integer + 8-bit humidity decimal + 8-bit
temperature integer + 8-bit temperature decimal + 8-bit checksum).
744 Chapter 5. Learn about the Components in Your Kit

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the SunFounder ESP32 and is the answer not in the manual?

SunFounder ESP32 Specifications

General IconGeneral
BrandSunFounder
ModelESP32
CategoryController
LanguageEnglish