had problems using SoftwareSerial for communication with the ESP2866 WIFI module. This is a nice and easy solution, but it might not work in all cases. This means if your actual serial RX / TX pins are allocated by some hardware device but you also need to to write output to the debug monitor, use SoftwareSerial for the hardware device and send your debug information to the actual serial port. Option 1: Use SoftwareSerial for hardware communication So we basically have three options, two of them involving additional hardware. Still we cannot simply receive the data using Serial Monitor, since it is expecting data from the actual UART RX / TX pins. SoftSerial.println(“Hello SoftwareSerial”) How can we receive this data? SoftwareSerial softSerial(10, 11) // RX, TXĪgain, we have to specify a baud rate for communication: Then create a SoftwareSerial instance and specify the GPIO pins that will be used as RX / TX pins. The API is very similar to the original Serial API. With the help of this library we can select two different GPIO pins and use them for emulated serial communication. Luckily, there is a simple solution readily available for this scenario in the form of the library SoftwareSerial. So how can we debug (or rather print information from) our sketch now? SoftwareSerial to the Rescue! Serial over USB is not available if the Arduino’s RX / TX pins are used. Connecting and thus blocking these pins means we now cannot use the serial over USB communication through the UART mechanism any more. A problem arises though if we connect the RX / TX pins (pins 0 and 1) of the Arduino to another device or shield. All you need to check now is that the baud rate is set to the same value as we specified in the script (9600 in our case). To receive this data while the sketch is running, we need to open Serial Monitor on the Tools menu (shortcut Ctrl+Shift+M). ![]() UART enables serial communication over USB. This is enabled by the UART device on the Arduino’s chip. This data now gets sent over USB to the connected PC. All we need to do is open the Serial port at a specified baud rate. ![]() This is pretty straight forward through the Serial API. Since Arduinos usually don’t come with a display where output can go to, we usually use serial (COM) communication to receive debug output. But how can we receive this data? Using Serial Monitor Especially on devices like Arduino where we normally deal with short sketches, printing information about the program’s state works reasonably well. ![]() It’s not elegant, it’s not pretty but it often gets the job done. Let’s admit it, we all have written that kind of code. It commonly works like this: printf("here 1") Debugging an Arduino sketch usually happens in a way that is often referred to as “ printf debugging”.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |