2.5 mm x 5.5 mm Chassis mount power connector from Digikey cost $0.86ġ2. Micro USB Male jack from Amazon for power to Pi costs $4.47 for lot of 10 (see above)ġ1. SPST switch for Pi power from Digikey cost $3.37ġ0. 32 GB microSD memory from Amazon costs $8ĩ. Raspberry Pi Model 3B+ from Amazon costs $38Ĩ. VGA and HDMI to LVDS Converter Board part number M.NT68676.2A and backlight power supply from EBay costs $19.53ħ. Total parts cost for a basic KVM is approximately $50Ħ. VGA to LVDS Converter Board part number MT561-MD and backlight power supply from EBay costs $11 40cm long LVDS cable from EBay costs $7 (or extend the short cable that comes with the converter board)Ħ. Micro USB Male jack from Amazon costs $4.47 for lot of 10ĥ. Micro USB breakout connector ADA1833 from Adafruit costs $4.74Ĥ. Flexible Printed Circuit (FPC) connector from AliExpress costs approximately $5 for a lot of 5ģ.Keyboard Scanner board from my Instructable.Teensy 3.2 from Amazon costs $24 Note: some laptops can use a Teensy LC from Amazon at $16 if you are building a basic KVM.Teensy USB Controller for the Keyboard and Touchpad as outlined in step 4. Start with a broken laptop and the cost should be close to free.Ģ. Select a donor laptop with the features outlined in Step 2. You can also go to my GitHub repository to view and download all relevent files.ġ. I will include download buttons for the relevant files in the Instructable.
![portable usb touchpad portable usb touchpad](https://images-na.ssl-images-amazon.com/images/I/41XAEBJ2yeL.jpg)
Portable usb touchpad how to#
This project uses the ideas from the Instructable " How to Make a USB Laptop Keyboard Controller" in order to repurpose an old broken laptop into a useful server debug tool.
Portable usb touchpad Patch#
An Ethernet patch cable gives the Pi access to the server via a web browser. Pressing Fn and F8 on the keyboard selects the server or Pi video for the display. The server or Pi USB is selected with a switch on the side of the laptop. In addition, the HDMI and USB from the Pi can be connected to the LCD and keyboard/touchpad, creating a Linux laptop. The Pi KVM can connect to the server VGA and USB ports just like the basic KVM. The Raspberry Pi KVM also uses steps 1 thru 6 plus steps 10 thru 13. The basic KVM (covered in steps 1 thru 9), displays the VGA video from the server and sends keyboard/touchpad data over USB to the server. This Instructable describes how to make a KVM by replacing the motherboard in a broken laptop with a Teensy keyboard/touchpad controller and a video converter card.
![portable usb touchpad portable usb touchpad](https://i5.walmartimages.com/asr/e6f250f5-17ea-41de-84a1-21119d8c2bc3_1.6f6f543b1ab6ac795b193a80fe2fbda6.jpeg)
Troubleshooting a headless server sometimes requires a “Crash Cart” with a keyboard, video display, and mouse (KVM).