Wireless Keyboard And USB 2.4 GHz Receiver
For about $25 at the nearby Best Buy or Walmart you can pick up one of these HP Elite V2 wireless keyboards for use with your laptop or desktop computer. I found myself in the market for a replacement keyboard after I spilled a drink over my keyboard and, even after allowing weeks of drying time, the keyboard didn’t work and couldn’t be repaired. (I’ll go into detail about the actual failure mechanism in a blog post at another time.)
These are the Elite wireless keyboard’s features I found most noteworthy:
- The 2.4GHz wireless connection provides up to 30ft (10m) of operating range
- Link-5 Technology: The USB receiver connects 5 HP Link-5 devices at the same time
- Fully capable keyboard with fast-access hot keys and complete number pad
- Slim modern design is light weight and in an ergonomic pleasure to use
Getting Setup For A Look Inside
Install and Setup
Bringing up the keyboard for use is simple. HP includes the necessary AA batteries in the keyboard so that’s taken care of. The USB receiver plugs into your computer. After a minute or so of plugging in the receiver, I saw this popup appear on the screen that said I was ready to sync my keyboard and computer.
Newer computers will automatically detect and accept the USB receiver.
Press the blue sync button on the keyboard to pair it with the USB receiver.
Open The Cover, Look Inside
Once I had the keyboard working properly, I wanted to know more about what’s inside the keyboard that links it to my computer. There are several screws to remove the bottom cover, but after they are out the insides of the keyboard are exposed for investigation and probing.
The most notable subsystem inside the keyboard is what I call the Control Board, pictured below. When I press the blue sync button on the keyboard, it presses down on the SW1 component in the picture, which in turn makes LED1 in the upper left corner start blinking. With this cause and effect relationship in mind, I set out to investigate the waveform causing the LED to blink when the keyboard and receiver were paired.
Pictured below, an iPod Touch (early model) and Oscium’s iMSO-104 handheld oscilloscope probe the cathode side of the LED.
Watch a short video sequence of the probed LED voltage on the portable oscilloscope.