To run the code, click on the Green play / arrow button and the Python Shell will update to say TOGGLE every second, and the LED will flash on and off. Name the file blink.py and click Ok to save.
Click on Save and choose to save the code to the MicroPython device (Raspberry Pi Pico). Lastly, we add a sleep to pause the code for one second between each iteration of the loop. Inside of a while True loop, a loop with no end, we toggle the LED on and off, and print a message to the Python Shell (REPL) to prove that the loop is working. We then use the object to instruct the GPIO pin to pull low.n other words this will ensure that the GPIO pin is turned off at the start of our project. In this case, it will set GPIO 28 (which maps to physical pin 34 on the board) as an output pin, where current will flow from the Raspberry Pi Pico GPIO to the LED. Create an object, “led” which is used to create a link between the physical GPIO pin and our code. The first is the Pin class from the Machine library, the second is utime, used to control the pace of our code. Our code is written in the large blank space above the REPL and we start by importing two MicroPython libraries. There’s something between those events that triggers this. But before building anything with it, you’ll need to know which pins you can use, and how to address them in your code. It’s powered via USB, includes 40 GPIO pins (like other Raspberry Pi models), and can run MicroPython scripts. Next, there are times when the shell section in thonny shows the following error:įile “”, line 19, in button_reader_threadĪfter a lot of attempts, I think I’ve been able to repeat this deterministically – keep hitting the push button repeatedly when the light switches from green to amber. The Raspberry Pi Pico is a low-cost microcontroller device. You can then quickly hit RUN to make it stop (say, is there a way to run a some code whenever STOP is pressed to do clean up such as this? Like when a thread receives a SIGTERM?) :( It also helps initialize the buzzer to 0 in case you press STOP while the buzzer is beeping. I did connect 3V3_EN to the button instead of 3V3 in the previous project by mistake. Either that, or there’s something wrong with my board. There were a couple of times where red and green were on at the same time before the code went through one cycle of the loop.
For some reason, it seems that the pins can give a random output voltage unless the output is set. I think it would be useful to initialize the LEDs (at least green and amber) and the buzzer before entering the loop.
I’m currently on the traffic lights chapter.
Firstly, thank you for writing this book! I’m hoping to re-do all the projects in C++ to learn that platform as well. Apologies if this is not the right place to post this.
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