The **Pi-KVM v3 HAT Board** is designed to work with the **Raspberry Pi 4** and provides the following features:
* **HDMI capture** device with max resolution 1080p 50Hz and audio support
* **Keyboard**&**mouse** emulation
* **Mass storage emulation** (i.e., virtual flash drive or CD drive provided by image file saved on PiKVM)
* Ability to simulate "**removal and insertion**" for USB for above mentioned devices
* **ATX controller** (allowing to switch power even if target device is off or operating system hangs)
* Onboard **real-time clock**
* 5v PWM **fan controller**
* USB & RJ-45 **serial console**
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## Requirements
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To use Pi-KVM v3, you will need the following things, which are NOT included in the base kit:
* **Raspberry Pi 4** (a model with any amount of memory is suitable)
* **5.1v 3A** official Raspberry power supply with USB-C
* A regular **HDMI cable**
* **USB-C to USB-A cable** with DATA lines (for keyboard and mouse emulation)
* **Straight Ethernet cable** (NOT crossover, to connect the HAT board and ATX board)
* **Micro-SD** card at least **16 Gb class 10** is strongly recommended
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# Known issues & limitations
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* The actual frame rate of the image received via HDMI will depend on the network bandwidth, resolution and the load on the Raspberry Pi. This is usually ~20-24 FPS for 1080p over LAN.
* **AIMOS** switches are not fully compatible with the video capture device (as with regular HDMI CSI bridge).
* There may be **compatibility** issues with some motherboards (such as **HP** or **DELL**) which are the same as those that exist with Pi-KVM v2. Not everything is perfect, but if you have already used Pi-KVM v2 - our new v3 will work perfectly and please you. If there is no image from the BIOS, you can fine-tune the HDMI settings, but it is possible that the USB keyboard or Mass Storage devices will not be available in the BIOS.
* If you plan to use Pi-KVM v3 with an **Apple Mac**, then you should know that you won't be able to get into UEFI or Recovery Mode. Inside macOS, the device will work fine. To use with Apple UEFI, you need to purchase our AUM board (Advanced USB Module, a small optional device for Pi-KVM v3), which will be available soon.
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# Installation
1. [Build the device](https://www.youtube.com/watch?v=-SRL92VJ870).
2. [Install the operating system](flashing_os.md) (choose the v3 image).
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systemctl enable --now kvmd-fan # For the fan
ro
```
5. **Important!** If you are going to use GPIO pins to control a relay, KVM switch, or anything else, be sure to check the v3 shield pinout. Many ports are busy with internal functions. Before using them for your own use, you must disable them, otherwise you may damage the device.
Maxim Devaev
3 years ago
committed by
GitHub