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This product is a wireless IR thermal imaging camera based on the ESP32-S3-WROOM-1 chip, adopts the hybrid technology of microbolometer and thermopile pixel, features 80x62 array pixels. It will detect the IR radiation energy distribution of objects in the field of view of the lens in real time, and generate temperature distribution maps and thermal imaging images of the surface of the objects through quantization processing. In addition, it integrates a recharge and discharge circuit, with onboard Lithium battery header for flexible power supply.
The module leads out the idle pins of ESP32 S3, making it convenient for users to solder the pins themselves. If additional welding is needed, please make sure to remove the lens module first. You can use the 2x10 patch pin header with pitch of 1.27mm.
The ESP32 S3 module controls the thermal imaging module via SPI
What is infrared temperature measurement? (Refer to OPTRIS)
In the field of measurement, "temperature" is one of the most commonly used physical parameters after "time". Based on the principles of Planck's and Boltzmann's radiation laws, an infrared thermometer measures the temperature of an object by absorbing the infrared radiation emitted by the object. So, how does non-contact temperature measurement work?
Any object with a temperature above absolute zero (0 K or -273.15 °C) emits electromagnetic radiation from the surface, and the radiation is proportional to the object's inherent temperature. This radiation includes infrared radiation used to achieve temperature measurement. When this radiation penetrates the atmosphere, it can be concentrated on the detector with the help of a special lens. The detector then generates an electrical signal proportional to this radiation. This signal is amplified and converted into an output signal proportional to the temperature of the object by undergoing continuous digital signal processing. In this way, the measured value of the temperature will be displayed on the display, or output as a signal.
In the application of radiation for temperature measurement, the emissivity ε (Epsilon) plays a crucial role. It shows the relationship between the radiation values of actual objects and those of a black body. The emissivity of a black body is 1 (maximum value). However, there are not many objects that can meet the ideal condition of a black body. When calibrating the sensor, the contact surface of the radiator (including the recommended wavelength: 0.99) is generally used.
In terms of their wavelength, many objects usually have a constant emissivity, but their radiation capacity is much inferior to that of a black body, they are called gray bodies. If the emissivity of an object depends on its temperature and wavelength (e.g., metal), it is called a selective radiator. In both cases, the missing radiation part is explicitly supplemented by the radiation rate. When using selective radiators, it is important to keep in mind the wavelength being measured (for metals, short wavelengths are chosen).
In addition to the radiation emitted from the surface of the object, the infrared sensor can also receive reflected radiation from the surrounding environment and perhaps penetrating infrared radiation from the object being measured.
Operating temperature °C | Target temperature °C | Maximum deviation °C | |
Full frame accuracy | 30.0 | 32.0-40.0 | ±1.0 (center 32x24),±1.2 (entire) |
30.0 | 10-32.0,40.0-70.0 | ±1.5 (entire) | |
30.0 | <10.0,>70.0 | ±2.0 (entire FPA), or 5% | |
Single pixel | 30.0 | 32.0-40.0 | ±0.5 (center 32x24),±0.7 (entire) |
30.0 | 10-32.0,40.0-70.0 | ±1.0 (entire) | |
30.0 | 32.0-40.0 | ±2.5 (entire), or 5% | |
Temperature stability | 30.0 | 32.0-40.0 | -0.21℃/℃ |
Power stability | 30.0 | - | ±1.0 ℃ / 100 mA |
We provide source code and factory firmware. The module is tested and pre-programmed with the factory firmware before shipment. Users can configure WiFi parameters and perform tests using a Bluetooth App.
The program supports setting WiFi parameters through Bluetooth, making it convenient for users to switch WiFi environments in actual use without the need for additional program compilation and download. The app can only support Android phones.
After the module is successfully configured, users can debug the output through the serial port, or directly check the IP of the device on the Bluetooth APP page. In AP mode, the module's IP defaults to 192. 168.4.1 with port number 3333
Note: After obtaining thermal imaging images using AP mode, you need to press the Reset button to restart the module before switching back to STA mode.
In order to facilitate users in resetting modules and testing, we provide factory firmware and flashing tools to facilitate users to re-flash factory firmware for testing.
The demos we provide are based on VS Code and ESP-IDF. If the user has other development environment requirements, they need to refer to the demo and configure it themselves.
ESP-IDF environment setup, including the installation of Visual Studio and Espressif IDF plugins, as well as providing simple program compilation, download, and demo testing tutorials for first-time users to help them smoothly set up the environment and use it
The firmware source code is provided in the Resources section. Users who need it can download it and perform secondary development
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