Categories
Electronics

PWM with STM8S

PWM is a great way to control brightness of LEDs, speed of motors, etc. Most microcontrollers including STM8S has built in ability to generate PWM signals. In this article I share simple code to generate PWM signal in STM8S microcontroller. However, I don’t write anything about PWM theory other than basic calculation to get required frequency and duty cycle.

Categories
Electronics

Bootloader-less Programming Arduino Pro Mini

Recently I was creating a configurable timer circuit based Arduino Pro Mini. The circuit has a momentary push button which user can press to turn ON the device. The device will turn OFF itself once the time is elapsed. On starting, Arduino has to turn on a relay to get permanent connection to power source, so it will get power when user released the push button. One issue I faced was that Arduino takes around 3 seconds to start executing the program because of the presence of the bootloader. So, user would have to keep push button pressed for around 3 seconds to get the device started. I wanted to get rid of bootloader so Arduino will start executing the program soon we press the push button for a moment.

Categories
Electronics

STM8S: Timer 2 with Overflow Interrupt

In previous post I showed how we can use Timer 2 as simple counter. In this post I am going to show how we can program to have interrupt when its value overflow. As simple experiment, we will toggle an LED in each second within the interrupt handler (also called ISR, Interrupt Service Routine).

Categories
Electronics

STM8S: Use Timer 2 as Simple Counter to Blink LED (without Interrupt)

Timers inside MCUs are very useful and essential peripherals for timing applications. In this article I will show Timer 2 in an STM8S (specifically STM8S103F3) can be used to blink an LED.

Categories
Electronics

Program STM8S Development Board with ST-Link v2

I successfully programmed development board having STM8S103F3P6. It is quite simple to make it blink LED. For me, it was second easiest after Arduino Uno to get started. I used SDCC as the C compiler, ST-Link v2 clone as programmer, and stm8flash to flash the binary file through ST-Link.

Categories
Electronics

Program AVR Microcontroller with USBTinyISP and Eclipse IDE

In this post I will detail out how we can program an AVR microcontroller, specifically ATTiny13a, with USBTinyISP and Eclipse IDE in Linux environment. I am using Ubuntu 16.04 LTS. I hope it will work in other distributions with little or no modifications.

Categories
Software

Install Driver for TP-Link TL-WN823N in Raspberry Pi 2 Model B

Recently I brought TP-Link TL-WN823N wireless USB adapter to connect my Raspberry Pi over wireless network. Mine is Raspberry Pi 2 Model B, so not having built in wireless capability. I chose TP-Link TL-WN823N over Edimax EW-7811Un because of its 300 Mbps speed, both were available on amazon.in with similar price.

It did not get detected out of box when plugged into my laptop running Ubuntu 16.04. The driver available at TP-Link website could not be installed because it was for older version of kernel. However, I could easily find driver over Googling and it worked fine.

Categories
Software

Copy CD & DVD to ISO File in Linux

Sometimes I require to copy entire CD or DVD to a file in my computer in ISO[^1] format. Usually to keep it for frequent access. It is what I do normally with tutorial discs received with some products, discs of wedding videos that I need to return back soon. So, I can avoid keeping the disc in player, also it helps for copying that to another disc.

Here I am sharing the command that I use for copying contents from the optical discs to a file in my computer in ISO format. This is a note for me too, as I require to remember it occasionally.