Board enables us to interact with the GPIO, digitalio is used to control the state of a GPIO pin. The next two, “board” and “digitalio” are CircuitPython specific libraries. The first is “time” and this is used to control the pace of our code. Any conductive objects will work, aluminium foil and card is a cheap and easy way to make fun touch interfaces.ġ. Using crocodile clips, connect a banana to input 0 of the MPR121, attach the other banana to input 1. Using a Capacitive Touch Sensor With CircuitPython With the test complete we can move on to Project 2. The LED should now flash on and off every 0.1 seconds. Your code should look like this import time Create a while True loop which will turn the LED on (led.value = True) and off (led.value = False) every 0.1 seconds. Our LED is connected to GPIO 17, which in CircuitPython is board.D17. Using an object, led, we tell CircuitPython which GPIO pin we are using, and that it is an output. Open the Thonny editor and import three libraries of code. The wiring for this project looks as follows.ġ. For this project we shall wire up an LED to GPIO 17 via two jumper wires and a 330 Ohm resistor. It enables us to be certain that our code is working and that our wiring is sound. Since I am a beginner I can ask silly questions, sorry about that.The humble flashing LED is always the first test for a new electronics project. I want to use serial communication used at. Can I read the value I wrote directly from the computer via modbus without using any transmitter? To start I want to write a simple number using modbus poll, pi pico is connected to my computer via usb. I realized that pi pico does not have wifi so I have to use modbusRTU. I am grateful for your detailed explanation and assistance. Of course, it still won't work when the UART API differs at the board level, when physical, software and virtual UART all have different and distinct API. That shouldn't be a problem, except that trying to do something not supported won't succeed. The only board specific thing is that UART.īoards could present board specific network transport layers if they support it, others would not. It would just work for any board with a UART when running SLIP on the host. If it were not, existed, it could connect to a non-board specific SLIP library, which calls a UART. It doesn't exist for a Pico so cannot be used, nothing which requires it will work.īut I don't believe it should be board specific. It doesn't resolve the fact that some boards simply can't do all the things others can, but it does mean that libraries which would work on multiple boards do, don't need updating and altering to make them work. It means a library that uses, say UART, which could work for all boards doesn't and won't when boards have a differing API for UART.ĬircuitPython seems better in this respect, appearing to have a more top down approach, a common API which boards are required to facilitate when they can. One of the things I dislike about MicroPython is the 'design philosophy' that, except for core functionality, the API is per-board, bottom up, so code for one board might not be usable on something else. Unlike Python, MicroPython can be platform-dependent, as different boards have different capabilities.
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