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The project has been finished but there is some optimizations. I have almost ran out of the IO pins of the stm32 bluepill board. Now i have an idea that to determine the state of…

There are some images from the manufacturer for the low cost little board orangepizero is available but i liked the dietpi OS because it is lightweight and they provided a tasksel like tool to easily…

A guy need a incubator motor controller and asked me to built one for him. The function will be as following. Wait one hour Run the dc gear motor forward for 10 seconds Wait one…

As I am working at an amusement park, our roller coaster ride suddenly had a problem. It never stopped, it is continuously running over and over. It was supposed to run on the loop two…

Now comes the trickiest part, to capture the pulse with a STM32 blue pill board and send it to computer via serial. I will use arduino for programming. The pinout I have found for the…

To determine the segment pins, i had to remember the theory of seven segment. Seven segments usually has 7 LED for showing a single digit and one led for a dot(i dont care for it…

The mighty DT830D multimeter. DT830D Multimeter battery removed After opened, the meter looks like this. DT830D Meter Opened, not showing the back cover. The LCD pads has 31 pins. Among those, 3 pins are shorted…

To read the data from a multimeter, at first i have to determine the individual pins of LCD, which is connected to which segment, the microcontroller voltage to drive the LCD and the nature of…

I was fascinated of getting data to PC to conditionally control other things, or making graphs to make the thing more understandable. There are RS232 capable, even bluetooth capable multimeter are available but those costs…