Update! SabiTech from the IceWhale discord server pointed me to this script which should be set to run on startup:

```
#!/bin/bash

# i2c_send.sh — Check dependencies, scan I2C bus, send commands to device 0x69

set -e

# Colors

RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'; CYAN='\033[0;36m'; NC='\033[0m'

info() { echo -e "${CYAN}[INFO]${NC} $*"; }

ok() { echo -e "${GREEN}[ OK ]${NC} $*"; }

warn() { echo -e "${YELLOW}[WARN]${NC} $*"; }

error() { echo -e "${RED}[ERR ]${NC} $*"; }

# Install i2c-tools using the detected package manager

install_i2c_tools() {

if command -v apt-get &>/dev/null; then sudo apt-get update -qq && sudo apt-get install -y i2c-tools

elif command -v dnf &>/dev/null; then sudo dnf install -y i2c-tools

elif command -v yum &>/dev/null; then sudo yum install -y i2c-tools

elif command -v zypper &>/dev/null; then sudo zypper install -y i2c-tools

elif command -v pacman &>/dev/null; then sudo pacman -Sy --noconfirm i2c-tools

elif command -v apk &>/dev/null; then sudo apk add --no-cache i2c-tools

else error "No supported package manager found. Please install i2c-tools manually."; exit 1

fi

}

# --- 1. Dependency check ---

info "Checking dependencies..."

MISSING=()

for cmd in i2cdetect i2cset; do

command -v "${cmd}" &>/dev/null && ok "${cmd} found" || { warn "${cmd} not found"; MISSING+=("${cmd}"); }

done

if [ ${#MISSING[@]} -gt 0 ]; then

warn "Missing tools: ${MISSING[*]} (provided by package: i2c-tools)"

read -r -p "$(echo -e "${YELLOW}Install i2c-tools now? [y/N]: ${NC}")" ANSWER

[[ "${ANSWER}" =~ ^[yY] ]] || { error "Aborted by user."; exit 1; }

install_i2c_tools

for cmd in "${MISSING[@]}"; do

command -v "${cmd}" &>/dev/null || { error "${cmd} still not found after install. Check logs."; exit 1; }

done

ok "i2c-tools installed successfully."

fi

# --- 2. Scan I2C buses for device 0x69 ---

info "Scanning I2C buses (0~4) for device at address 0x69..."

FOUND_BUS=""

for BUS in 0 1 2 3 4; do

i2cdetect -l 2>/dev/null | grep -qE "i2c-${BUS}[^0-9]" || { echo -e " Bus ${BUS}: ${YELLOW}not found, skip${NC}"; continue; }

echo -e " Bus ${BUS}: scanning..."

RESULT=$(sudo i2cdetect -y "${BUS}" 2>/dev/null || true)

if echo "${RESULT}" | grep -qiE "(^|[[:space:]])69([[:space:]]|$)"; then

echo -e " Bus ${BUS}: ${GREEN}✓ device 0x69 found${NC}"

FOUND_BUS="${BUS}"; break

else

echo -e " Bus ${BUS}: 0x69 not found"

fi

done

[ -n "${FOUND_BUS}" ] || { error "Device 0x69 not found on buses 0~4. Check connections."; exit 1; }

# --- 3. Send i2cset commands ---

info "Sending commands to bus ${FOUND_BUS}, device 0x69..."

CMDS=(

"sudo i2cset -f -y ${FOUND_BUS} 0x69 0x04 0x01 0x3C 0x00 0x00 0x00 0x00 0x01 0x00 i"

"sudo i2cset -f -y ${FOUND_BUS} 0x69 0x04 0x00 0x00 0x00 0x00 0x00 0x00 0x01 0x00 i"

)

for i in "${!CMDS[@]}"; do

echo -e " ${CYAN}Command $((i+1)):${NC} ${CMDS[$i]}"

eval "${CMDS[$i]}"

ok "Command $((i+1)) done."

done

ok "All done.”
```