When writing MQTT, stm32 subscribes to multiple topics. I don't know how to judge the topic. How to judge? Which topic to judge? I can't debug the program after writing it. Please help....
error: invalid use of non-static member function ‘void Camcallbackc::camcallbackm(const ImageConstPtr&, const CameraInfoConstPtr&)’image_transport::CameraSubscriber sub = it.subscribeCamera("/camera/r...
CV measurementCapacitance-voltage (CV) and AC impedance measurements are commonly performed on many types of devices for a wide variety of applications. For example, CV measurements are used to determ...
【CC26X2R1_LAUNCHXL.c】 Add the red code to the following structureGPIO_PinConfig gpioPinConfigs[] = {
……/* ADS1261 */GPIOCC26XX_DIO_30 | GPIO_DO_NOT_CONFIG, /* CS has 100K pull-up, input, low effective...
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Probes are often an afterthought when choosing the right measurement tool for an oscilloscope application. When many engineers select an oscilloscope, they often first consider bandwidth, sample ra...[Details]
The accuracy of electromagnetic flowmeters is generally calibrated by the manufacturer's laboratory before leaving the factory. Since they are used on site, they may be subject to instrument failures ...[Details]
The car's accelerator pedal position sensor converts the amount (angle) of pedal depression into a voltage signal, thereby providing the engine control unit with a signal of the actual opening angle ...[Details]
The so-called programmable interface chip refers to an interface chip whose function can be changed by the instructions of the microprocessor. By programming, an interface chip can perform different ...[Details]
01 "Xiaoyaozi" bids farewell, the Zhang Yong era ends
Four years ago on September 10, the day of Alibaba’s 20th birthday, at the grand annual meeting, accompanied by applause and c...[Details]
Electromagnetic flowmeters are widely used in current industrial production. They can be applied to the measurement of various conductive liquids, especially in water-based fluids and various acidic ...[Details]
Yesterday, Xiaomi officially released the Mi MIX Alpha surround screen concept phone, but the price of 19,999 yuan made many Mi fans feel that they couldn't afford it. Many netizens asked if there wo...[Details]
Many people don’t know that the world’s first electronic computer was the Atanasoff-Berry Computer (ABC). It was designed in 1937 by Professor John Vincent Atanasoff of Iowa State University and his ...[Details]
Recently, Mir Electronics' high-end product MYC-JX8MPQ core board and development board were launched. The MYC-JX8MPQ core board uses NXP's first high-performance processor i.MX 8M Plus with integrat...[Details]
Microsoft today announced a partnership with Qualcomm to provide better support for applications running on Windows on ARM. Microsoft will expand App Assure with the FastTrack testing platform. Mic...[Details]
The tri-state circuit is an important bus interface circuit, which is composed of several tri-state output gates with their output terminals connected to the bus. The tri-state refers to the output o...[Details]
Chalcogenides are alloys composed of elements from group 16 of the periodic table (older periodic table: group VIA or VIB). At room temperature, these alloys are very stable in both the amorph...[Details]
The Samsung Galaxy S22 series is the latest offering from the South Korean tech giant, and the Galaxy S22 Ultra is the flagship device in the lineup, which is a great device by several parameters. Ho...[Details]
On June 16, Shanghai awarded eight smart manufacturing characteristic industrial parks, namely: Robotics Industrial Park, Waigaoqiao Smart Manufacturing Service Industrial Park, Minhang Development Z...[Details]
With the continuous advancement of science and technology and the transformation of the global energy structure, the automotive power system is undergoing unprecedented changes. From traditional fu...[Details]
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