> I also made a complete step by step video tutorial, to go from zero to bidirectional communication with Serial in 1h – check that out if you like to learn with video content:Īfter watching the video, subscribe to the Robotics Back-End Youtube channel so you don’t miss the next tutorials! I’ll use mostly Arduino Uno but will give more details about the differences between Arduino boards when it comes to Serial communication. This tutorial will work with a Raspberry Pi 4 (and earlier: 3B, 3B+) board, and any Arduino board. A basic example at first, leading to a more complete application using a Raspberry Pi, an Arduino, and other electronic devices. Then you’ll see how to setup your hardware and software, and we’ll dive into the Python code (Cpp for Arduino). Regarding my suggestion of using the Arduino Mega as ISP, it's not the ideal as I just realized the Mega is a 5V board and it can cause damage to the RFM69 and SPI Flash as both are 3.3V.In this tutorial I’ll show you how to communicate between a Raspberry Pi and an Arduino board via Serial communication.įirst, I’ll quickly explain what is Serial communication. I don't have an Arduino Mega board but the tests using and Arduino Uno worked fine, so I assume it will work as well for the Mega. Now, you can try to upload a sketch, select the Whisper Node hardware on the Arduino IDE and after hit "upload" wait it to compile and when the IDE starts the upload process perform a manual "reset" as describe above, by touching the RST to ground and releasing it. You'll see that when you release it, the Whisper Node will boot and show the Splash screen again. You can try now to "reset" the Whisper Node by touching and holding the RST pin (from item 3 above) to ground. If not, just try to invert the TX and RX pins - I frequently get it wrong. Connect GND and 3.3V pins from Mega to GND and VIN respectively on Whisper Node. This Pin is between the PIN 13 and the GND pin.ĥ. Connect a "wire" to the RST pin on the Whisper Node. Remember you'll only see the "Splash" screen when you power or reset the Whisper Node.ģ. Connect the Mega Serial Pins, as you did before, to the Whisper Node so you can see the "Splash" screen. This will disable the MEGA MCU and you can now hijack the USB-to-Serial adapter.Ģ. Disable the MEGA by connecting the RESET Pin on Mega to Ground. The trick is to "reset" the Whisper Node manually during the sketch upload.ġ. I did try here using an Arduino Uno board and was able to program it via Serial without removing the chip, which is the case when you have an Arduino Mega. The only option if you only have the Arduino Mega would be to use it as an ISP programmer and upload your code using the ISP headers, but the easiest option might be get an USB-to-Serial adapter, just search for FTDI adapter on eBay or other electronic shop. In case of the Arduino Mega, you can't remove the chip, so you might not be able to use it to program the Whisper Node over serial. To use an Arduino Uno as USB to Serial adapter the ideal is to remove the chip from the board and connect TX, RX as you mentioned, but also connect the Reset from the Arduino board to the DTR/RTS pin, so the USB-to-Serial will be able to send the "reset" command before start uploading the code. If the MCU is already running, nothing will happen as the data will "hit" the main program. The Serial Upload is only possible during the start-up as the bootloader running on the MCU waits a few milliseconds for commands on the serial port from the Arduino IDE. The program is happening because you also need to control the Reset pin, normally done by the DTR/RTS pin.
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