Hermann Björgvin HaraldssonandClaude Opus 4.6
2611c70881
Physical desk monitor that displays Claude Code usage limits (5-hour session and 7-day weekly utilization) on an ESP32-S3 touchscreen via USB serial. Firmware: LVGL 9 dashboard with LovyanGFX on SC01 Plus, Anthropic brand colors and custom fonts (Tiempos, Styrene B, DejaVu Sans Mono), Claude spinner animation with rotating status words. Daemon: Pure bash script that reads the Claude Code OAuth token, makes a minimal Haiku API call, extracts usage from rate-limit response headers, and sends JSON to the ESP32 over serial. Uses inotifywait for instant USB plug/unplug detection. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
129 lines
4.1 KiB
Bash
Executable File
129 lines
4.1 KiB
Bash
Executable File
#!/bin/bash
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# Claude Usage Tracker Daemon
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# Reads Claude Code OAuth token, polls usage via API, sends to ESP32 over serial.
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# Survives USB plug/unplug cycles using inotifywait for instant device detection.
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# Dependencies: curl, awk, inotify-tools
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SERIAL_PORT="${SERIAL_PORT:-/dev/ttyACM0}"
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SERIAL_DEV=$(basename "$SERIAL_PORT")
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POLL_INTERVAL=30
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BAUD=115200
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SERIAL_FD=3
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log() {
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echo "[$(date '+%H:%M:%S')] $1"
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}
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read_token() {
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grep -o '"accessToken":"[^"]*"' "$HOME/.claude/.credentials.json" | cut -d'"' -f4
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}
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device_connected() {
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[ -e "$SERIAL_PORT" ]
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}
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open_serial() {
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stty -F "$SERIAL_PORT" "$BAUD" raw -echo -echoe -echok 2>/dev/null || return 1
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eval "exec ${SERIAL_FD}<>\"$SERIAL_PORT\"" 2>/dev/null || return 1
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return 0
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}
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close_serial() {
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eval "exec ${SERIAL_FD}>&-" 2>/dev/null
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}
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# Wait for device to appear using inotifywait (blocks, zero CPU)
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wait_for_device() {
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while ! device_connected; do
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inotifywait -qq -e create /dev --include "$SERIAL_DEV" 2>/dev/null || sleep 1
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done
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}
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poll() {
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local token
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token=$(read_token) || { log "Error: could not read token"; return 1; }
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local now
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now=$(date +%s)
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local headers
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headers=$(curl -s -D - -o /dev/null \
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"https://api.anthropic.com/v1/messages" \
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-H "Authorization: Bearer $token" \
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-H "anthropic-version: 2023-06-01" \
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-H "anthropic-beta: oauth-2025-04-20" \
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-H "Content-Type: application/json" \
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-H "User-Agent: claude-code/2.1.5" \
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-d '{"model":"claude-haiku-4-5-20251001","max_tokens":1,"messages":[{"role":"user","content":"hi"}]}' \
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2>/dev/null) || { log "Error: API call failed"; return 1; }
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local s5h_util s5h_reset s7d_util s7d_reset status
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s5h_util=$(echo "$headers" | grep -i "anthropic-ratelimit-unified-5h-utilization" | tr -d '\r' | awk '{print $2}')
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s5h_reset=$(echo "$headers" | grep -i "anthropic-ratelimit-unified-5h-reset" | tr -d '\r' | awk '{print $2}')
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s7d_util=$(echo "$headers" | grep -i "anthropic-ratelimit-unified-7d-utilization" | tr -d '\r' | awk '{print $2}')
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s7d_reset=$(echo "$headers" | grep -i "anthropic-ratelimit-unified-7d-reset" | tr -d '\r' | awk '{print $2}')
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status=$(echo "$headers" | grep -i "anthropic-ratelimit-unified-5h-status" | tr -d '\r' | awk '{print $2}')
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s5h_util=${s5h_util:-0}
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s5h_reset=${s5h_reset:-0}
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s7d_util=${s7d_util:-0}
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s7d_reset=${s7d_reset:-0}
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status=${status:-unknown}
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# Build JSON payload in a single awk process (utilization * 100, timestamps to minutes)
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local payload
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payload=$(awk -v u5="$s5h_util" -v r5="$s5h_reset" -v u7="$s7d_util" -v r7="$s7d_reset" -v st="$status" -v now="$now" \
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'BEGIN {
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sp = sprintf("%.0f", u5 * 100);
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sr = (r5 - now) / 60; sr = sr > 0 ? sprintf("%.0f", sr) : 0;
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wp = sprintf("%.0f", u7 * 100);
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wr = (r7 - now) / 60; wr = wr > 0 ? sprintf("%.0f", wr) : 0;
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printf "{\"s\":%s,\"sr\":%s,\"w\":%s,\"wr\":%s,\"st\":\"%s\",\"ok\":true}", sp, sr, wp, wr, st;
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}')
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if ! echo "$payload" >&${SERIAL_FD} 2>/dev/null; then
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log "Write failed - device disconnected"
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return 1
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fi
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}
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cleanup() {
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close_serial
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log "Daemon stopped"
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exit 0
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}
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trap cleanup INT TERM
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log "=== Claude Usage Tracker Daemon ==="
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log "Serial port: $SERIAL_PORT"
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log "Poll interval: ${POLL_INTERVAL}s"
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while true; do
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# Wait for device (instant detection via inotify, or already plugged in)
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if ! device_connected; then
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log "Waiting for device..."
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wait_for_device
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fi
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log "Device connected"
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sleep 2 # wait for ESP32 boot
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if ! open_serial; then
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log "Failed to open serial port"
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sleep 2
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continue
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fi
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log "Serial port opened"
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# Poll loop - polls API every POLL_INTERVAL, exits on disconnect or write failure
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while device_connected; do
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poll || break
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# Sleep POLL_INTERVAL but wake instantly if device disappears
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inotifywait -qq -e delete /dev --include "$SERIAL_DEV" -t "$POLL_INTERVAL" 2>/dev/null
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done
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# Disconnected - clean up and loop back to wait
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log "Device disconnected"
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close_serial
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done
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