Computer

Raspberry PI has many models, memory and their own SD card capacity is not the same, so we can create a Raspberry PI system display system, the Raspberry PI CPU temperature, CPU usage, memory, hard disk (SD card) capacity and IP address information through OLED display, especially IP address, In this way, we can know […]

This time I decided to make a timer that does the same job as the one we use on our phone or a stopwatch. As we all know, we can press two buttons: one controls the start and stop of the count, and the other resets the timer. I’ve split it into two parts, firstly […]

Now that I can use OLED to display text, I have an idea for an electronic clock. I can get real-time time data by calling the time library, and then print the hours, minutes and seconds on the OLED. The DateTime library is needed, it allows me to get information about dates and times. Here […]

In my previous two blogs, I learned about using ADC to detect the voltage across a variable resistor and using OLED to display some messages. So, I came up with the idea of displaying the detected voltage using the OLED. Flow Chart: The process is very similar to the previous one, the only difference is […]

OLED short for Organic Light-Emitting Diode – a technology that uses LEDs in which the light is produced by organic molecules. It is a solid-state device consisting of a thin, carbon-based semiconductor layer that emits light when electricity is applied by adjacent electrodes. The characteristic of OLED is that it can emit light by itself, so […]

The function of the ADC is to convert analogue signals into digital signals. Since computers can ultimately only recognise binary numbers, external analogue signals are often converted by the ADC into digital information that it can recognise. In Raspberry PI, a common application is to convert a changing voltage into a digital signal. Raspberry Pi […]

In my last work, the buzzer stayed on continuously, which was not in line with the real situation, so this time I want to change the buzzer’s sounding pattern so that the buzzer’s sounding frequency is synchronised with the frequency of the LED blinking. Main Code: The main idea of this code is to use […]

I thought about it for a few days and decided that although I could control the sound of the buzzer, it wasn’t good enough. I remembered that when the alarm is set off in the general movie, there is not only the alarm sounds but also the red light flashes at the same time, so […]

Applications in our daily life: In daily life, many electronic devices will alarm when they encounter malfunctions, and the sound is often easier to draw people’s attention than the indicator light, the buzzer can help us to achieve this function. There are two types of buzzers, they are active buzzers and passive buzzers. Active buzzers […]

Keys are the simplest and most common input device. As shown from the diagram below, KEY1 is connected to Raspberry Pi pin 12 and KEY2 is connected to Raspberry Pi pin 13. The other end of the key is connected to the ground. So when the key is not pressed, a high level (1) is […]