Raspberry Pi + Klipper Setup for Ender 5-S1 (No Sonic Pad)

Install Klipper & Mainsail interface with raspberry pi imager

Select raspberry pi Lite Os and set up password protection on the Raspberry Pi by going to Settings. Change or keep the hostname and username.
Write to SD card. When finished, insert SD into raspberry pi
Ping the hostname using your username chosen in the settings from step 1: ping hostname.local
Copy IP address and ssh into the pi: ssh username@ip_address
Download Kiauh. Install Klipper, Moonscraper, and Mainsail
Access Mailsail from browser - use hostname.local you pinged earlier to access Moonsail web interface: http://klipperpi.local

Build & flash firmware for the 3D Printer

After installing Klipper, Moonscraper, and Mainsail, the 3D printer needs to run the Klipper firmware. The Ender 5-S1’s original firmware is Marlin, so we need to build and flash the Klipper firmware onto the machine to replace it.

Build Firmware

Download the printer.cfg file from trhis repo. For other printers, look up your 3D printer’s config file here
The commented out section at the top of the config file should show the mainboard details. The Ender 5-S1 runs Creality serial 64-bit motherboard (ARM STM32F401 CPU) and PA10/PA9
Run Kiauh. Go to: Advanced > Build only (under Firmware)
Input the mainboard details from the config file Ender 5-S1 settings:

Micro-controller: STM32
Processor: STM32F401
Bootloader Offset: 64KiB
Comm Int: Serial on USART1 PA10/PA9

Press enter; this will build the firmware on the Raspberry Pi and create a klipper.bin file. The .bin file is located at out/klipper.bin

Flash Firmware

After building Klipper firmware you must copy the klipper.bin from your pi to your computer so you can put the klipper.bin on an SD card, and then SD card will then be placed into the 3D printer to flash it. A printer.cfg file is then needed for Mainsail to talk to your printer. The klipper.bin file and the STM32F4_UPDATE folder containing the printer.cfg are available to download from this project, but you can follow these directions to do it yourself with Mainsail

Copy Klipper firmware from out/klipper.bin to the klipper config folder accessible by Mainsail: cp klipper/out/klipper.bin /home/<raspberrypi_username>/printer_data/config
Download the klipper.bin to your computer from the Mainsail interface: Machine > klipper.bin > download
From your computer, wipe the SD card using Disk Utility on Mac if card is not empty. Change directory into SD card: cd /Volumes/<sd_card_name>
Create a file named STM32F4_UPDATE on the SD card and place the klipper.bin file inside of it
Insert the SD card into 3D printer, power on printer, and flashing will begin automatically. Screen will go black and stay black with Klipper software. After 2 minutes power off 3D printer and back on again
Download a printer.cfg file for your specific 3D printer and upload it to Mainsail
Run a Firmware Restart and visit the Mainsail Dashboard to see your printer

Sources

Video on Klipper flashing with Kiauh and Mainsail: https://www.youtube.com/watch?v=-SYqTW7wJTo
Gist with Ender 5-S1 settings: https://gist.github.com/chouch0u/dd4f1f739635d9eca3b19ec7f60686a7
Reddit post from @killinmesmalls with settings and specialized printer.cfg file https://www.reddit.com/r/ender5/comments/118v3eu/klipper_make_config_settings_for_ender_5_s1/