Uncategorized Archives - Page 2 of 3

February 2, 2020

Dropzone.js – 1 [upload files]

Dropzone.js is a JavaScript library which provides drag and drops file upload with preview. It works with or without jQuery within the project and also it doesn’t require any other libraries. It doesn’t upload the…

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Khairul Hasan

February 1, 2020

Tampermonkey script to identify job posts from certain country in upwork – 1

I am a part-time freelancer for a while now. In the meantime I have grown experience that the behavior/need/payment most of the clients from certain countries are not good. Of course there are exceptions, but…

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Khairul Hasan

January 4, 2020

Reading data to PC from a cheap multimeter – 6

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…

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Khairul Hasan

December 30, 2019

Cross Compiling Orangepizero OS Image

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…

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Khairul Hasan

December 30, 2019

Arduino Egg Incubator Motor Controller

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…

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Khairul Hasan

December 1, 2019

Relay based two step counter

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…

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Khairul Hasan

November 19, 2019

Reading data to PC from a cheap multimeter – 5

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…

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Khairul Hasan

November 18, 2019

Reading data to PC from a cheap multimeter – 4

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…

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Khairul Hasan

November 18, 2019

Reading data to PC from a cheap multimeter – 3

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…

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Khairul Hasan

November 9, 2019

Reading data to PC from a cheap multimeter – 2

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…