diff --git a/devices/build.sh b/devices/build.sh
new file mode 100755
index 0000000..9a76159
--- /dev/null
+++ b/devices/build.sh
@@ -0,0 +1,133 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+DEVICES_DIR="$(cd "$(dirname "$0")" && pwd)"
+ARDUINO_CLI="arduino-cli"
+LIBRARIES_DIR="${DEVICES_DIR}"
+
+GREEN='\033[0;32m'; RED='\033[0;31m'; YELLOW='\033[1;33m'; NC='\033[0m'
+
+ok()   { echo -e "${GREEN}✓${NC} $*"; }
+err()  { echo -e "${RED}✗${NC} $*"; }
+info() { echo -e "${YELLOW}▸${NC} $*"; }
+
+ERRORS=()
+
+# ─────────────────────────────────────────────
+# compile <sketch_dir> <fqbn> <output_dir> [channel_num]
+#   channel_num — если передан, патчит CHANNEL_NUM в .ino во временной копии
+# ─────────────────────────────────────────────
+compile() {
+    local sketch_dir="$1"
+    local fqbn="$2"
+    local output_dir="$3"
+    local channel_num="${4:-}"
+
+    local sketch_name
+    sketch_name="$(basename "${sketch_dir}")"
+    local label="${sketch_name} [${fqbn}]"
+    [ -n "${channel_num}" ] && label="${sketch_name} x${channel_num} [${fqbn}]"
+
+    info "Building ${label}..."
+
+    local build_src="${sketch_dir}"
+
+    # Для варианта с нестандартным CHANNEL_NUM — временная копия скетча
+    # Папка должна называться как скетч, иначе arduino-cli не найдёт .ino
+    local tmp_root=""
+    local tmp_dir=""
+    if [ -n "${channel_num}" ]; then
+        tmp_root="$(mktemp -d)"
+        tmp_dir="${tmp_root}/${sketch_name}"
+        mkdir "${tmp_dir}"
+        find "${sketch_dir}" -maxdepth 1 -type f -exec cp {} "${tmp_dir}/" \;
+        local ino_file="${tmp_dir}/${sketch_name}.ino"
+        sed -i "s/extern const uint8_t CHANNEL_NUM = [0-9]*/extern const uint8_t CHANNEL_NUM = ${channel_num}/" "${ino_file}"
+        build_src="${tmp_dir}"
+    fi
+
+    mkdir -p "${output_dir}"
+
+    if ${ARDUINO_CLI} compile \
+        --fqbn "${fqbn}" \
+        --libraries "${LIBRARIES_DIR}" \
+        --output-dir "${output_dir}" \
+        "${build_src}" \
+        > /tmp/arduino_build.log 2>&1; then
+        ok "${label} → ${output_dir}"
+    else
+        err "${label} — FAILED"
+        cat /tmp/arduino_build.log | tail -20
+        ERRORS+=("${label}")
+    fi
+
+    if [ -n "${tmp_root}" ]; then rm -rf "${tmp_root}"; fi
+}
+
+# ─────────────────────────────────────────────
+# Targets
+# ─────────────────────────────────────────────
+
+echo ""
+echo "═══════════════════════════════════════════"
+echo "  Smart Home Firmware Build"
+echo "═══════════════════════════════════════════"
+echo ""
+
+# relay — ESP-01S (esp8266 generic)
+compile "${DEVICES_DIR}/relay" \
+    "esp8266:esp8266:generic" \
+    "${DEVICES_DIR}/relay/build/esp8266.esp8266.generic"
+
+# relay — ESP32-C3
+compile "${DEVICES_DIR}/relay" \
+    "esp32:esp32:esp32c3" \
+    "${DEVICES_DIR}/relay/build/esp32.esp32.esp32c3"
+
+# button — D1 Mini, 2 канала (дефолт)
+compile "${DEVICES_DIR}/button" \
+    "esp8266:esp8266:d1_mini" \
+    "${DEVICES_DIR}/button/build/esp8266.esp8266.d1_mini" \
+    2
+
+# button — D1 Mini, 4 канала
+compile "${DEVICES_DIR}/button" \
+    "esp8266:esp8266:d1_mini" \
+    "${DEVICES_DIR}/button/build/esp8266.esp8266.d1_mini_x4" \
+    4
+
+# ─────────────────────────────────────────────
+# Копируем релизные бинари в builds/
+# ─────────────────────────────────────────────
+copy_release() {
+    local src_dir="$1"
+    local dst_dir="${DEVICES_DIR}/builds/$2"
+    local bin_name="$3"
+    mkdir -p "${dst_dir}"
+    cp "${src_dir}/${bin_name}.bin" "${dst_dir}/${bin_name}.bin" 2>/dev/null || true
+    cp "${src_dir}/${bin_name}.elf" "${dst_dir}/${bin_name}.elf" 2>/dev/null || true
+    cp "${src_dir}/${bin_name}.map" "${dst_dir}/${bin_name}.map" 2>/dev/null || true
+}
+
+echo ""
+info "Copying release binaries..."
+copy_release "${DEVICES_DIR}/relay/build/esp8266.esp8266.generic"       "relay_esp8266_x1"    "relay.ino"
+copy_release "${DEVICES_DIR}/button/build/esp8266.esp8266.d1_mini"      "button_esp8266_x2"   "button.ino"
+copy_release "${DEVICES_DIR}/button/build/esp8266.esp8266.d1_mini_x4"   "button_esp8266_x4"   "button.ino"
+
+# ─────────────────────────────────────────────
+# Итог
+# ─────────────────────────────────────────────
+echo ""
+echo "═══════════════════════════════════════════"
+if [ ${#ERRORS[@]} -eq 0 ]; then
+    ok "All builds succeeded"
+else
+    err "Failed builds:"
+    for e in "${ERRORS[@]}"; do
+        echo "    - ${e}"
+    done
+    exit 1
+fi
+echo "═══════════════════════════════════════════"
+echo ""