ATtiny85 Automates Your Smartphone

Photo of a smartphone with the ATTiny85 inserted into it, with a screen unlock pattern being drawn on the screen

It might not seem too impressive these days, but when microcontrollers with hardware USB support were more expensive and rare, the VUSB library was often used to create USB devices with an ATtiny85. It became so popular that the ATtiny85 even got packaged into USB dongle formfactors, like the DigiSpark boards. Well, you might not know this, but your Android smartphones can also work with USB mice and touchscreens in lieu of the built-in touchscreen display. [ErfanSn] combined these two ideas, creating a library to automate smartphone touchscreen events and keyboard input with an ATtiny85 — open for all of us to use, and with examples to spare.

The library is called DigiCombo, and it comes with plenty of examples for any screen touch event emulation that you might want. For instance, check out the README — it has video examples for Instagram page scrolling, unlock screen brute-forcing with random coordinates, playing the Stack rhythm game, and pinch zoom — all the building blocks for your smartphone touch emulation needs are covered pretty well! Of course, all of these have example code corresponding to them, that you can download and base your own ideas on. What’s more, the library is available in current Arduino IDE under the DigiCombo name. So if you need to, say, make a quick autoclicker for your phone, the library is a few steps away!

If your smartphone project was stalled because you needed to emulate touchscreen input, this library is your chance to get it done! We appreciate projects that let us get more from smartphones — there’s a lot of those laying around, they’re pretty functional and self-sufficient devices, so it makes sense that some projects of ours could do with a phone instead of a Raspberry Pi. Some manufacturers let us get a bit more of our phones, but this hasn’t really caught on, which means we have to make do with help of libraries like these. Or, perhaps, you rely on your phone day-to-day, and you’d like to add a touchpad to its back?

14 thoughts on “ATtiny85 Automates Your Smartphone

    1. You have been able to plug devices into Android phones for a while. Assuming the device is supported natively or you have an app that works with it then you can plug in all sorts of devices. Mice, keyboards, flash drives or hard drives, even webcams and drone video receivers. Or an unusual one, my USB oscilloscope.

      Apple devices used to only work with certain USB devices but that has changed now, even on an older iPad (air 2) I can now use a mouse, keyboard, USB hub and storage devices. The iPad has a power limit though so only very low power devices work unless you use a powered USB hub.

  1. Links for example code and video are reversed.

    Not clear to me as to how useful it is to have a tiny Arduino controlling the touchscreen of an old phone. Unless one created a program for the old phone that you wanted to control from an Arduino. If we are writing a program for the old phone wouldn’t we control it from the phone? Or couldn’t the Arduino run the program instead of running it on the old phone.

    Now interfacing an ESP32 with WiFi and Bluetooth to your old phone might be interesting. But using the ESP32 to run existing apps on your old phone doesn’t make a lot of sense. Until we create a full phone touchscreen interface accessible from the web using an ESP32. Assuming you want to access a phone using a web interface into it. Android emulation already runs on Linux and Windows so you don’t need an old phone to run Android applications on a laptop or pc. Though you might not have the phones GPS, gyro, and Compass and a touchscreen on your laptop or pc.

    You could program the Tiny to make a call or send a text message using the phone’s cellular connection. That might be cool if you have a spare active cellphone. Or you could periodically send the phones GPS location. Though one could write Android apps that run on the phone to do both of these.

    If you didn’t have fingers to use the phone’s touchscreen this might be useful.

  2. One idea comes to mind.i dropped my phone once (some years ago) and it seemed to be fine at first, but then the digitizer was broken, so I could no longer unlock it. That phone also did not support OTG back then, so also no external mouse. With this I might have used it to unlock the phone and from there see what I could have done.

  3. Will this let me cheat at Golf Clash, or other similar games?

    Pressing a button on screen can started manually, but RELEASE must coincide with a swinging needle on screen being in the correct position. An external camera sensor needs to be added for that.

  4. i use ATtiny85 digispark when i Arduino write paste code i got a lot of error, your code like: DigiCombo.begin(); and my code like: DigiKeyboard.sendKeyStroke(0); and I’m confuse can you explain thank you.

  5. It’s fascinating to see how creative individuals and developers can leverage hardware and software to extend the capabilities of microcontrollers and smartphones. The DigiCombo library you mentioned seems to be a useful tool for emulating touchscreen events and keyboard input with an ATtiny85, opening up possibilities for various smartphone-related projects.

    Here are a few thoughts on this development:

    1. **Accessibility:** Libraries like DigiCombo can make smartphones more accessible to users with specific needs or those who want to customize their interactions with the device. It can also serve as a valuable resource for developers working on assistive technology projects.

    2. **Prototyping and Rapid Development:** The ability to emulate touchscreen input and keyboard events using microcontrollers can significantly speed up the prototyping process for smartphone-related projects. It allows developers to test and experiment with various ideas quickly.

    3. **Learning and DIY Projects:** Such libraries can be educational tools for individuals looking to learn more about microcontroller programming and smartphone integration. DIY enthusiasts can explore unique project ideas.

    4. **Customization:** The ability to create custom touch events and keyboard input opens up opportunities for creating unique user experiences or automating specific tasks on smartphones.

    5. **Integration with Other Projects:** Developers can integrate smartphone control into larger projects, combining the capabilities of microcontrollers and smartphones to create more complex systems and applications.

    6. **Community and Collaboration:** Open-source libraries like DigiCombo foster collaboration and knowledge sharing among developers and hobbyists. Users can contribute to the library’s development and share their project ideas and implementations.

    As technology continues to advance, these types of creative projects and libraries expand the possibilities of what we can do with our devices. Whether it’s for practical applications, learning experiences, or simply for fun, such innovations contribute to the ever-growing world of DIY and maker culture.
    And if u want to social media app bio’s then u can pic here

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