You can also install it on a Raspberry Pi, which is what I did for this experiment. But you can easily extend this to have multiple keys. Adafruit has a CircuitPython library for these devices, allowing us humans to interface with our computers. So before we create a program to emulate a keyboard we will need to install this library. Get the Library Bundle Version at the very top of the list, this will be a collection of the latest production CircuitPython libraries.
Once you have this list unzip it on your local computer. You have now installed the Adafruit HID library, which we need for both our keyboard and mouse emulators. As you can see all we have done is connected a couple of pushbutton switches to two of the GPIO pins.
You could add more switches and use different pins, nothing here is critical. The other side of both pushbuttons is connected to 3.
The CircuitPython code for the keyboard emulator is shown here:. The code is pretty simple, thanks to the power of the Adafruit HID library. If you need to emulate a different keyboard you can find details by reading the Adafruit HID Library documentation. We then define our two pushbuttons, one for record and one for stop. Note how in both cases we specify the GPIO pin not pin number for each button, and then define that pin as an input. We also define a pull-down resistor for each input, to hold the input LOW until a button is pressed.
In the True loop, we look to see if a button is pressed. If it is, we do the following:. We do this for each button. We can make a single button correspond to multiple keys, or to a sequence of keys. Load the code and then open a Text Editor to try it out. I then tried it in Audacity and it works, starting my recording with my red button and stopping it with the black one.
I could extend this to have an advanced keyboard emulator with multiple keys. This could be very useful in situations where you want to automate an operation, perhaps involving a web page, that requires a mouse or a mouse and keyboard. If you know the screen coordinates you need to click you could program the Pico to go there and click it for you. We will also use the two pushbuttons that we used in the last experiment as our left and right mouse buttons.
Here is how we will hook up our Pico to the Joystick. Note that the two pushbutton connections remain as they were in the previous experiment.
The joystick we are using is a standard joystick that consists of two potentiometers. Our two switches are wired up as in the Keyboard emulator, only their functions have changed.
Fortunately, Adafruit has provided an example that is almost what we need, all that needs to be done is to modify it to use the two pushbuttons instead of the one built into the joystick.
This is essentially the Adafruit sample code, modified to use a couple of pushbuttons instead of the built-in switch on the joystick.
We define our two analog inputs and set up the pushbuttons exactly as we did in the keyboard emulator experiment. In this experiment, our pushbuttons are the left and right mouse buttons. We define a minimum and maximum value for our input voltage, based upon our use of 3.
We then define steps based upon that range. We create two functions, one to get the voltage at the analog pins and the other that maps that voltage to a discrete step.
In the True loop, we read the pot values and look to see if a button is being pressed. We then check to see if our mouse pointer needs to move.
We do this in two ranges so that we can vary the speed of the pointer at extremes of the joystick. As we do this for each input for both the positive and negative direction we run through this step several times.
Load the code and save code. The two pushbuttons should act as the left and right mouse buttons. A microSD card is a great way to store large quantities of data gathered by a microcontroller like the Pico. You can use one as part of a data logging system. We will be doing a very basic experiment, simply writing some data to a microSD card and then reading it back. Can i add more sensor MQ2 and buzzer in your library? Can you help me? I am waiting for your reply….
I have the 4 pin version of the DHT I running Python 3. Any ideas? Thanks for this article. And of course humility. Great info. Where should the module be, or how do I tell python where it is? Do you have a tutorial of how to link the data w get from the dht 11 to thing speak using websocket and django frame work?
Hi Thank you for this nice tutorial. It works nice… Thank you. Still cannot get by Pi to find the Adafruit module. I tried reintalling from the complete instructions in the article. When I try the apt-get for git-core, it reports not found, and reverts to git, so I let it run.
It does try to install the Adafruit module and seems to succeed, but Python cannot find it. Cheers and thanks for all your great content! Hi, this is Jay, very thanks for sharing your project. Hi, I am a newbie please be gentle : I can get this to run to display on the terminal but cant get it to display on the LCD display. The display is lit but nothing showing.
Python 3. Any suggestions on where i have gone wrong please? The code in the example is very old, and only works on python2 which is end-of-life. Most current Linux distributions come with python3 out of the box, and that requires a different syntax.
Does this work with a Rapsberry Pi 4b? I tested the DHT 11 earlier in the day with an Arduino and it worked fine. With C code I get Data not good, skip even when changing the time intervals. With the python code nothing happens at all. I could not get the C code to work, however, the Python worked well. So I wrote my own C version based on the Adafruit python library. I have three sensors all DHT11, So far I have only been able to get the temp and Humidity sporadically with the python program.
Yo Admin, is it compatible with raspberry pi 4 b? What should i do? Thanks for sharing this! All the best! Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email. I agree to these terms. Consent to store personal information: I agree to let Circuit Basics store my personal information so they can email me the file I requested, and agree to the Privacy Policy.
Email me new tutorials and very occasional promotional stuff: Yes No. It covers all of the steps, diagrams, and code you need to get started. Related Posts. SpaceMonkey on March 25, at am. Really helpful! Please try everyone: Reply. Alex on March 25, at pm. Scott on April 22, at am. Actually yes, the adafruit library supports all of the DHT modules. Neil Wallace on June 14, at pm. Any updates on the Adafruit code? Circuit Basics on March 25, at am. JC on October 24, at am.
Thanks Reply. Nagesh on February 16, at am. I do get the same error.. OrangePi User on August 7, at pm. Is this working with Orangepi One? Julio Orrego on August 14, at am. Vijay on August 18, at am. Julio Orrego on August 19, at pm. Holly on May 31, at am. Nikki on May 26, at pm. Lilan on October 29, at pm. Ola Dunk on December 5, at am.
John Harper on August 29, at am. Jathavedas Avadhani on September 7, at pm. Jan on March 22, at pm. Thank you Reply. Alexandre Strube on September 8, at pm. Cooper on May 19, at am. Alexandre Strube on September 9, at am. So, the C code works… the Python one does not. Alexandre Strube on September 12, at pm.
Adrin on September 19, at am. Maybe this is why. Ricardo Gamba on September 27, at am. Best regards, Ricardo Gamba. RtfmFlo on December 26, at pm. Nanda on October 2, at am. Pikkemoos on October 19, at pm. Works great, thanks. Dawid on November 14, at pm. Getting below error when trying to run LCD script, can anyone help? OUT Reply. Brennan on March 27, at am. Tanay on December 15, at pm. Did this ever work.
I Am getting the similar error. Please let me know, how solved this? I would try to install it again… Reply. SiMON on January 28, at am. I moved my python code into the Adafruit source folder and managed to get it working from there Reply. Rizwan Shoukat on January 1, at am. Jakub Demeter on January 24, at pm. Alex on February 27, at pm. Have the same problem, did you find any solution? Roshan Patel on January 27, at pm. Juhi on February 13, at pm. Pkarni on April 8, at am.
May 21, Gate assembly code out if not actually used, Nov 19, Implement faster 4-wide diffing of framebuffers that is twice as fast…. Jul 4, Jun 23, Nov 20, Properly abort run if failed to allocate GPU memory. Jun 12, Add example picture. Nov 18, Add an option to display a simple low battery icon. Oct 30, Add link to video about frame rate stuttering test. Jun 17, Jun 21, Aug 25, If DispmanX fetch fails, attempt to cleanly terminate the driver appl….
Sep 13, Add support for KeDei v6. Dec 10, Add support for ILIL. Thanks IndianBoy42 Fixes Jul 2, Mar 10, Mar 24, Update ilil. Read keyboard for input keys to control when to wake up from sleep. Jul 3, May 20, Mar 28, Clean up definitions for ILI displays. Fixes 6. May 28, Clean up display vs controller specific include headers to remove dup….
Reduce code duplication by merging all clear screen functions under o…. Jun 13, Automatically compute vertical scroll address based on display width …. Jul 23, Remove unused function InitStatistics.
Apr 3, Add frame completion time histogram statistics overlay. Jun 16, Jun 19, Apr 21, May 9, Optimize redundant memory copying and do memory copying in a single p…. Jul 9, Closes Sep 6, Jun 11, View code. Does fbcp-ili work on Pi Zero? The driver works well, but image is rotated 90 degrees.
How do I rotate the display between landscape and portrait? The driver works well, but image is upside down. How do I rotate the display? How exactly do I edit the build options to e. When I change a CMake option on the command line, it does not seem to apply Does fbcp-ili work with linux command line terminal or X windowing system?
Does fbcp-ili work on Raspberry Pi 1 or Pi 2? Does fbcp-ili work on display XYZ? Does fbcp-ili work with 3-wire SPI displays? Does fbcp-ili work with touch displays?
Is it possible to break my display with this driver if I misconfigure something? I am running fbcp-ili on a display that was listed above, but the display stays white after startup? The display stays blank at boot without lighting up The display clears from white to black after starting fbcp-ili, but picture does not show up?
Image does show up on display, but it freezes shortly afterwards Image does show up on display, but when I start up program XYZ, the image freezes The display works for some seconds or minutes, but then turns all white or black, or freezes The driver is updating pixels on the display, but it looks all garbled Colors look wrong on the display Failed to allocate GPU memory!
It does not build, or crashes, or something is obviously out of date Which SPI display should I buy to make sure it works best with fbcp-ili? Check out these videos for examples of the driver in action: fbcp-ili frame delivery smoothness test on Pi 3B and Adafruit ILI at Hz Latency and tearing test 2: GPIO input to display latency in fbcp-ili and tearing modes Latency and tearing test: KeDei 3.
Other optimizations are also utilized to squeeze out even more performance: The program directly communicates with the BCM ARM Peripherals controller registers, bypassing the usual Linux software stack. Good old interlacing is added into the mix: if the amount of pixels that needs updating is detected to be too much that the SPI bus cannot handle it, the driver adaptively resorts to doing an interlaced update, uploading even and odd scanlines at subsequent frames.
Once the number of pending pixels to write returns to manageable amounts, progressive updating is resumed. This effectively doubles the maximum display update rate. A number of other micro-optimization techniques are used, such as batch updating rectangular spans of pixels, merging disjoint-but-close spans of pixels on the same scanline, and latching Column and Page End Addresses to bottom-right corner of the display to be able to cut CASET and PASET messages in mid-communication.
MIT License. I resolved it by changing to the directory of the script before running it in cron. In your case, I would think that this crontab line should work:. Thank you very much for this instruction and fun little project.
I love this little displays, I am glad I have now one connected to my Octopi Raspi. I have never tried to do so, but you can set the script to display any metrics that are made available by other applications. So I would imagine you could pull data from pi-hole if you wanted to.
Great Tutorial my display works flawlessly thanks to all your information and steps. Great Job. The only thing I had to troubleshoot was I received two errors. Once I installed the following two packages worked perfectly. Thanks for the feedback Matthew. Thanks so much for making this follow up tutorial because I was having a little bit of trouble using the original one you created. Love this case by the way! I immediately got started using your tutorial and I have to say that everything worked great with the exception for the final step.
Nonetheless, I cannot get the script to auto run upon reboot. Alternatively, I did try it from the home screen as describe in your instructions and it still did not work. Any idea what could be wrong?
Then if i follow the last steps and have the script run on boot, will it auto turn on? You could also try using one of the GPIO pins to switch the power to the display on or off. Would you please tell me? Great video and mod for your original case. I have a question regarding 3d printinhg the case all the haps on the case have support filling which can be pushed out after printing.
Which paramtere did you use in Cura to create these support fillings.? Thanks Rav. Thanks for detailed instructions! I am having a trouble! I checked everything! I check whether anything in crontab has been changed, but there was all okay as per your instruction. Delete your Crontab file and create a new one, or just replace the existing one. For some reason this seems to work. Fantastic tutorial. I really enjoyed this project, making the case and getting the display functioning.
And change the line: draw. HEy very straight forward and easy to do. Thanks for also the small additions and changes to layout and change the font! Just a quick question: How to Show different Disks?
Like a mounted USB disk? Is it possible to have the Disk line Scroll and show each after another — or switch between on and another?
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