I don’t know how fast does your STM32 samples each ADC.
Arduino cw decoder code#
Then the buffer is processed the morse code letter is presented. N determines how many samples are done, each takes 112us. This reads the the analog value and then it is stored “n” times into the buffer. In practice the real world sampling rate is 8928 hz when it is read on the for loop like it is done on line 194 of the code above. You can read more about this topic here: The original programmer is Hjalmar, OZ1JHM, he will be way more qualify to answers these questions, but it is my understanding that the sampling freq is derived from the analogRead() function which takes 100 microseconds leading to a theoretical sampling rate of 9600 Hz.
So as you may know, I am not the original programmer of this code, I ported it to work on an arduino NANO. Categories Articles Tags morse code translator Post navigationĪre you using mbed? which STM32 are you using, I have a few evaluation boards myself. If you have any questions or comments, feel free to leave your message below. If you want to download the fabrication files click here and scroll down to the Export Data Design section. My version allows you to select the target frequency and also the bandwidth via jumpers.Ĭompleted PCB. You can etch, CNC machine or send out the files for fabrication.
In addition I also designed a single sided PCB version of the board for those who want to give it a try. I have deiced to post the schematics of my implementation and also the code I use on my version of this project.
Arduino cw decoder how to#
Most of the questions I get are about how to connect the components. I receive a lot of questions on this project. This post was made 1 year ago exactly to the date but it is the most viewed article on this site. If you are interested on building this CW decoder, but need assistance or have any questions feel free to send an email to. To increase the flexibility a microphone like this can be added to the circuitry. The “sketch” programmed in to the Arduino is based on the Goertzel Algorithm for those who are interested on how it works. Hjalmar published the schematics and source code for everyone to use. This Arduino based CW decoder was developed by Hjalmar, OZ1JHM.