If you have a kit without a metal case, you can use our free 3D printing case drawing: [v3.3](stl/v3.3/index.md){target=_blank} for the Kickstarter/Store model, [v3.2](stl/v3.2/index.md){target=_blank} for the pre-release.
* **HDMI input** and **USB emulation** port must be connected to the computer. **ATX** too, but it's optional, [read below](#atx-connection). There should be no USB hub between PiKVM and the computer, as some UEFI/BIOS cannot detect them at the boot stage. On the HDMI the HAT, like the CSI bridge, supports 1080p50Hz or 720p60Hz or lower.
4.**Carefully read [the "First steps" guide](first_steps.md){target=_blank}** - how to find a device on the network, how to log in there, change passwords, and so on. **Follow the steps described there and come back here**.
If you want the temperature to be displayed in Fahreneit on the OLED and you do not want to update the whole system, then you will need to do this first after going to root:
7.**Try to manage the computer using PiKVM with the Web Interface.** Make sure that you see the image, and the keyboard and mouse are working. If something doesn't work, check out our [FAQ](faq.md) (it's really useful). If nothing helped, you can get support in our [Discord chat](https://discord.gg/bpmXfz5).
Try restarting PiKVM using the `reboot` command executed in the terminal. If PiKVM hangs during boot (you can't get the Web Interface for a long time), then you are faced with this rare problem. **Don't worry, it's easy to fix.** Turn off the PiKVM, disconnect all cables from it, take a close look at the [diagram of its ports and jumpers](#io-ports-and-jumpers), and **remove jumper #14** (it is to the right of the CSI connector). Then you can connect and power up PiKVM again. Now everything will be fine.
**Before using GPIO** pins to control a relay, KVM switch, or anything else, be sure to [check the HAT pinout](#io-ports-and-jumpers). Many ports are busy with internal functions. Before using them for your own use, you must disable them, otherwise you may damage the device.
To manage the power of your computer, you will need to install an ATX adapter board inside the case and connect it to the motherboard.
1. Connect the rainbow wires as follows to the board. Optionally print [the mounting plate](stl/atx/index.md){target=_blank} for the PCI slot on a 3D-printer. Assemble everything like on pictures below. Secure wires in any convenient way (we used soft ties).
??? example
<imgsrc="atx_board_1.jpg"/>
<imgsrc="atx_board_2.jpg"/>
<imgsrc="atx_board_3.jpg"/>
2. Find the pins on the motherboard responsible for connecting the buttons and LEDs of the front panel of the case. Usually wires and connectors on the motherboard have designations. If you're not sure, check the documentation on your motherboard.
??? example
<imgsrc="atx_board_4.jpg"/>
<imgsrc="atx_board_5.jpg"/>
3. Place the ATX board nearby and, focusing on the signatures, connect the male pins to the female pin of the front panel wires, observing the polarity (the polarity is indicated on the ATX board).
??? example
<imgsrc="atx_board_6.jpg"/>
4. Repeat the procedure with the female pin of the ATX board by connecting them to the motherboard connector. Check the documentation on your motherboard.
??? example
<imgsrc="atx_board_7.jpg"/>
5. Install the ATX board into the PCI slot of the case and fix it with a screw, or use a different mounting method at your discretion.
??? example
<imgsrc="atx_board_8.jpg"/>
<imgsrc="atx_board_9.jpg"/>
6. Arrange the wires in a way that is convenient for you and fix them if necessary.
7. Connect the ATX board to PiKVM using a [straight Ethernet cable](https://www.home-network-help.com/straight.html). 2 pair/4 wire will NOT work, must be a 4 pair/8 wire.
14.**CSI-2 interface** and **HDMI backpowering** jumper, see [Step 8 of the Basic Setup](#basic-setup). Open: diode will stop current from HDMI input (backpower will be fixed), closed: will allow current from HDMI device.
18.**USB-C emulation port** - this port is doing the emulation of a USB keyboard, mouse, Virtual CD-ROM or USB Flash Drive, USB-Ethernet, USB-Serial port and a lot of other Linux-supported features.
19.**1-Wire**&**Neo-pixel** interface (under, advanced user feature).
* **1-Wire [19]** - `GPIO 4` - Also available under ATX RJ-45 port (point [19] on the above) as bi-directional buffered open-drain 5V for regular 1-Wire usage.
* **UART** - `GPIO 14, 15` - Can be used as UART only for the serial console. When jumpers [5] are removed, you can connect to pins 14 and 15 directly using GPIO header. Also you can remove jumper [5] and disable UART console in the `/boot/config.txt` and `/boot/cmdline.txt` to use this pins for any purpose. But it's not recommended.
* **Red activity led on the front [8]** - `GPIO 13` - Can be disabled in `/boot/config.txt` and available on the Neo-pixel port [19].
* **PWM fan controller** - `GPIO 12`. Can be used for custom purposes if the fan disconnected and `kvmd-fan` service is stopped.
* **I2S HDMI sound** - `GPIO 18, 19, 20, 21`. Can be used for custom purposes if the `tc358743-audio` overlay in `/boot/config.txt` is disabled **AND** jumpers [4] are removed.
* **USB breaker** - `GPIO 5` - Can't be used for any other purposes.
The pinout of the RJ-45 connector is the same on the AT and ATX adapter.
<imgsrc="rj45.jpg"/>
??? note "ATX LED wiring example"
<imgsrc="atx_led.jpg"/>
## Known issues and limitations
* 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**.
* There may be **compatibility** issues with some motherboards (such as **HP** or **DELL**) which are the same as those that exist with PiKVM v2. Not everything is perfect, but if you have already used PiKVM 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 Mass Storage devices will not be available in the BIOS.
