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CJMCU-0201 Double Touch Sensor Features A touch sensor is a type of switch that only has to be touched by an object to operate. Touch sensors work completely similar to a switch. This sensor has two separate pads and can be used as two separate switches. Note When this switch is subjected to touch, the output voltage will be HIGH, otherwise it is LOW. Note The output current is very low (about 40 mA). If you want to connect a higher current device to this switch, you must add a rela...

Inductive Proximity Sensor LJ12A3-4-Z/BY Features A proximity sensor is a sensor able to detect the presence of nearby objects. The inductive proximity sensor LJ12A3-4-Z / BY has three pins, two of which are connected to a supply voltage of 6 to 36V. The output pin is PNP and NO (Normally Open). That is, it is normally Low and when it detects an object, it is HIGH. The detection distance is 4 mm and it can only detect metal objects such as copper, aluminum, iron, etc. Note Because the operatio...

APDS-9930 Ambient Light Sensor Features This module consists of ambient light , IR and proximity sensors. The detection distance is up to 100 mm. The APDS-9930 sensor measures the ambient light. This sensor can also detect 0.01 Lux brightness in the dark. It can also be used behind dark glass like a mobile screen. For example, it turns off the touch screen during voice calls when your ear is close to the screen.This sensor can be used to adjust the brightness of mobile backlight and the approp...

LJ12A3-4-Z/BX Inductive Proximity Sensor Features Proximity sensors are used to detect the presence of nearby objects. The LJ12A3-4-Z / BX sensor has three pins, two of which are connected to a supply voltage of 6 to 36 V. The output pin is PNP and NO (Normal Open). That is, it is normally Low and when it detects an object, it becomes HIGH. The detection distance is 4 mm, and it can only detect metal objects such as copper, aluminum, iron, etc. Note Since the operation voltage is more than 5 V,...

AD9833 Signal Generator Module Features In many projects we need a signal with a specific waveform and frequency. The AD9833 signal generator module is a low-cost module for such applications. This module is capable of generating sine, triangular, square and half-square waveforms. You can adjust the frequency of generated signal from 1Hz to 12.5MHz. The communication protocol of this module is SPI. AD9833 Signal Generator Module Pinout This module has 7 pins:Ref: Re...

Overview Sometimes in electronic projects, you need to use two or more microcontrollers in your circuit at the same time. Normally, these microcontrollers are connected to each other and keep transmitting data with one another. The transmitting of data between two or more microcontrollers can be done with several communication protocols such as SPI, UART, CAN, USB, etc. Another one which we will be covering here in this tutorial is I2C (Inter-Integrated Circuit) protocol. Using this protocol, one of the mi...

Overview Power outages are one of the main problems for computers and electrical systems. Sometimes there is data and information in your system that you do not want to be deleted with a power outage. If you do not want your data and information to be lost when the power supply is disconnected, a simple way is to save your data to EEPROM memory.In some projects, such as a 3D printer, when the system is reset, the relevant data can be stored in EEPROM memory to calibrate the equipment and initialize it. ...

Overview There are two main ways to program the STM32F103C8T6 module, also known as the STM32 Blue Pill: • Serial and USB to TTL converter • ST-Link Tip Sometimes you might find out that the STM32 module you have is not original. And it can’t be programmed through serial. Therefore, we suggest you use ST-Link to program the STM32 Blue Pill. Required Materials Hardware Components STM32F103C8T6 Blue Pill × 1 ST-Link/V2 Programmer × 1 Male to Male Jumper Wire × 1 Software Apps Ar...