——Question 1: What is LoRa—— LoRa is the abbreviation of Long Range Radio. It can be seen from the name that its characteristic is that it has a long transmission distance. Under the same power consumption condition, it has a longer transmission distance than other wireless methods, realizing the unification of low power consumption and…

01  DS18B20 The main reason for putting the DS18B20 first is that it is so commonly used that when I think of the temperature sensor, the first thing that flashes through my mind is it. It is almost a temperature sensor that many electronic engineers will touch at the beginning. Of course, there are some reasons why it…

When the pin level of the main control chip does not match the level of the external connected devices, a level conversion circuit is required for conversion. This is a problem that almost every electronic engineer will encounter. Today I will summarize several commonly used level conversion schemes, hoping to help you. 1. Use level conversion chip…

STM32 is mainly a digital circuit. The digital circuit has only high and low levels and does not have the concept of a few volts. Therefore, if you want to read the voltage value, you need to use ADC analog-to-digital converter. ADC Read the analog voltage of the pin, convert it into a data, store it…

01  First“ impedance ”And“ impedance matching ”Concept of The resistance, capacitance and inductance existing in the circuit that hinder the current is called impedance. The unit of impedance is ohm (Ω) Z Is expressed as: Z=R+i(ωL–1/(ωC)) The plural of. real part R Is resistance, imaginary part (ωL–1/(ωC)) Is reactance, where ωL For inductive reactance, 1/(ωC) Is capacitive reactance.One of the important parameters of earphones and speakers that we usually contact is impedance, which is exactly…

01  Let’s start with the concept The full English name of I2C is Inter Integrated Circuit, which literally means between integrated circuits, that is, what we often call the I-side C bus – I2C bus. It is a serial communication bus, which uses a multi master slave architecture. It was developed by Philips (the parent company of…