diff --git a/ansible/event b/ansible/event
index 26b7e5e..038b81f 100644
--- a/ansible/event
+++ b/ansible/event
@@ -1,7 +1,8 @@
 [recorders]
-x220-01 ansible_host=fd11:f055:a514::2 ansible_user=opentech room_type=setup2 room_id= webcam_name=usb-046d_HD_Pro_Webcam_C920_CEB3336F
-x230-01 ansible_host=fd11:f055:a514::3 ansible_user=opentech room_type= room_id= webcam_name=usb-046d_HD_Pro_Webcam_C920_50EBAE4F
- ansible_host=fd11:f055:a514::4 ansible_user=opentech room_type= room_id= webcam_name=
- ansible_host=fd11:f055:a514::5 ansible_user=opentech room_type= room_id= webcam_name=
- ansible_host=fd11:f055:a514::6 ansible_user=opentech room_type= room_id= webcam_name=
-x220-02 ansible_host=fd11:f055:a514::7 ansible_user=opentech room_type= room_id= webcam_name=usb-046d_HD_Pro_Webcam_C920_312AF46F
+x220-01 ansible_host=fd11:f055:a514::2 ansible_user=opentech room_type=setup1 room_id=eventhall2-1 webcam_name=usb-046d_HD_Pro_Webcam_C920_50EBAE4F
+x230-01 ansible_host=fd11:f055:a514::3 ansible_user=opentech room_type=setup3 room_id=lecturetheatre webcam_name=usb-046d_HD_Pro_Webcam_C920_CEB3336F
+x240-01 ansible_host=fd11:f055:a514::4 ansible_user=opentech room_type=setup1 room_id=eventhall2-2 webcam_name=
+x240-02 ansible_host=fd11:f055:a514::5 ansible_user=opentech room_type=setup2 room_id=trainingroom2-1 webcam_name=
+x240-03 ansible_host=fd11:f055:a514::6 ansible_user=opentech room_type=setup2 room_id=trainingroom2-2 webcam_name=
+[audio_source]
+x220-02 ansible_host=fd11:f055:a514::7 ansible_user=opentech room_type=setup3 room_id= webcam_name=usb-046d_HD_Pro_Webcam_C920_312AF46F
diff --git a/ansible/group_vars/all b/ansible/group_vars/all
index 55e2b13..214c394 100644
--- a/ansible/group_vars/all
+++ b/ansible/group_vars/all
@@ -17,4 +17,4 @@ node_exporter_enabled_collectors:
 
 # Meta
 
-ansible_python_interpreter: auto
+ansible_python_interpreter: /usr/bin/python3
diff --git a/ansible/group_vars/audio_source b/ansible/group_vars/audio_source
new file mode 100644
index 0000000..196f4f8
--- /dev/null
+++ b/ansible/group_vars/audio_source
@@ -0,0 +1,3 @@
+---
+
+autostart: true
diff --git a/ansible/group_vars/recorders b/ansible/group_vars/recorders
index febf17d..95751df 100644
--- a/ansible/group_vars/recorders
+++ b/ansible/group_vars/recorders
@@ -1,8 +1,5 @@
 ---
 
-room_type: unknown
-room_id: unknown
-
 # Overwrite in inventory if cannot cope
 record_profile: 720p
 # Overwrite in inventory if want to use more storage to use less CPU
diff --git a/ansible/recorders-stop.yml b/ansible/recorders-stop.yml
index f7c993e..d9567aa 100644
--- a/ansible/recorders-stop.yml
+++ b/ansible/recorders-stop.yml
@@ -1,13 +1,19 @@
 ---
-- hosts: recorders
+- hosts: all
   roles:
     - productivity
+    - laptop
+    - role: cloudalchemy.node-exporter
+      tags: node_exporter
 
 - hosts: recorders
   roles:
-    - role: laptop
     - role: recorder
-    - role: cloudalchemy.node-exporter
-      tags: node_exporter
+  vars:
+    autostart: false
+
+- hosts: audio_source
+  roles:
+    - role: audio_source
   vars:
     autostart: false
diff --git a/ansible/recorders.yml b/ansible/recorders.yml
index d541ce0..b12f86c 100644
--- a/ansible/recorders.yml
+++ b/ansible/recorders.yml
@@ -1,12 +1,16 @@
 ---
-- hosts: recorders
+- hosts: all
   roles:
     - productivity
-
-- hosts: recorders
-  roles:
-    - role: laptop
-    - role: recorder
+    - laptop
     - role: cloudalchemy.node-exporter
       tags: node_exporter
 
+- hosts: recorders
+  roles:
+    - role: recorder
+
+- hosts: audio_source
+  roles:
+    - role: audio_source
+
diff --git a/ansible/roles/audio_source/tasks/audio_source.yml b/ansible/roles/audio_source/tasks/audio_source.yml
new file mode 100644
index 0000000..53c0798
--- /dev/null
+++ b/ansible/roles/audio_source/tasks/audio_source.yml
@@ -0,0 +1,19 @@
+---
+
+- name: remove existing audio_source network
+  command:
+    cmd: nmcli connection delete audio_source
+  ignore_errors: yes
+  become: yes
+
+- name: configure audio_source network
+  command:
+    cmd: nmcli connection add save yes ifname enp0s25 con-name audio_source type ethernet ipv4.method disabled ipv6.method manual ipv6.addresses "fd12:f055:a514:a0a0::1/64" ipv6.never-default true ipv6.addr-gen-mode eui64 ipv6.ignore-auto-dns yes ipv6.ignore-auto-routes yes
+  become: yes
+  when: autostart
+
+- name: enable audio_source network
+  command:
+    cmd: nmcli connection up audio_source
+  become: yes
+  when: autostart
diff --git a/ansible/roles/audio_source/tasks/ffmpeg.yml b/ansible/roles/audio_source/tasks/ffmpeg.yml
new file mode 100644
index 0000000..c205447
--- /dev/null
+++ b/ansible/roles/audio_source/tasks/ffmpeg.yml
@@ -0,0 +1,3 @@
+---
+
+- name: automatically start ffmpeg
diff --git a/ansible/roles/audio_source/tasks/main.yml b/ansible/roles/audio_source/tasks/main.yml
new file mode 100644
index 0000000..3b6d8df
--- /dev/null
+++ b/ansible/roles/audio_source/tasks/main.yml
@@ -0,0 +1,3 @@
+---
+- include: packages.yml
+- include: audio_source.yml
diff --git a/ansible/roles/audio_source/tasks/packages.yml b/ansible/roles/audio_source/tasks/packages.yml
new file mode 100644
index 0000000..574bae1
--- /dev/null
+++ b/ansible/roles/audio_source/tasks/packages.yml
@@ -0,0 +1,11 @@
+---
+
+- name: install packages required to be an audio_source
+  become: yes
+  apt:
+    state: latest
+    name:
+      - ffmpeg
+      # for NetworkManager in audio_source
+      - python3-dbus
+      - libnm-dev
diff --git a/ansible/roles/laptop/templates/greeter.dconf-defaults b/ansible/roles/laptop/templates/greeter.dconf-defaults
index 8d9192b..5e58a38 100644
--- a/ansible/roles/laptop/templates/greeter.dconf-defaults
+++ b/ansible/roles/laptop/templates/greeter.dconf-defaults
@@ -31,7 +31,7 @@ logo='/opt/login-logo.png'
 # disable-restart-buttons=true
 # - Show a login welcome message
 banner-message-enable=true
-banner-message-text='Hostname: {{ ansible_hostname }}\n{% if room_type %}Room: {{ room_type }} {{ room_id }}{% endif %}\nUsername: opentech Password: opentech\nUsername: mixer Password: mixer\n{% if autostart %}Mixer Autostart Enabled{% endif %}'
+banner-message-text='Hostname: {{ ansible_hostname }}\n{% if room_type %}Room: {{ room_type }} {{ room_id }}{% endif %}\nUsername: opentech Password: opentech\nUsername: mixer Password: mixer\n{% if autostart %}Mixer Autostart Enabled\n{% endif %}'
 
 # Automatic suspend
 # =================
diff --git a/ansible/roles/recorder/tasks/audio_source.yml b/ansible/roles/recorder/tasks/audio_source.yml
new file mode 100644
index 0000000..61ae9f3
--- /dev/null
+++ b/ansible/roles/recorder/tasks/audio_source.yml
@@ -0,0 +1,20 @@
+---
+
+- name: remove existing audio_source network
+  command:
+    cmd: nmcli connection delete audio_source
+  ignore_errors: yes
+  become: yes
+  when: room_id == "lecturetheatre"
+
+- name: configure audio_source network
+  command:
+    cmd: nmcli connection add save yes ifname enp0s25 con-name audio_source type ethernet ipv4.method disabled ipv6.method manual ipv6.addresses "fd12:f055:a514:a0a0::2/64" ipv6.never-default true ipv6.addr-gen-mode eui64 ipv6.ignore-auto-dns yes ipv6.ignore-auto-routes yes
+  become: yes
+  when: autostart and room_id == "lecturetheatre"
+
+- name: enable audio_source network
+  command:
+    cmd: nmcli connection up audio_source
+  become: yes
+  when: autostart and room_id == "lecturetheatre"
diff --git a/ansible/roles/recorder/tasks/main.yml b/ansible/roles/recorder/tasks/main.yml
index 341a15a..1fda27d 100644
--- a/ansible/roles/recorder/tasks/main.yml
+++ b/ansible/roles/recorder/tasks/main.yml
@@ -3,4 +3,5 @@
 - include: packages.yml
 - include: artwork.yml
 - include: obs.yml
+- include: audio_source.yml
 - include: textfile.yml
diff --git a/ansible/roles/recorder/tasks/packages.yml b/ansible/roles/recorder/tasks/packages.yml
index 1eb7bb2..c09e8f2 100644
--- a/ansible/roles/recorder/tasks/packages.yml
+++ b/ansible/roles/recorder/tasks/packages.yml
@@ -6,3 +6,6 @@
     state: latest
     name:
       - obs-studio
+      # for NetworkManager in audio_source
+      - python3-dbus
+      - libnm-dev
diff --git a/ansible/roles/recorder/tasks/textfile.yml b/ansible/roles/recorder/tasks/textfile.yml
index db2c9ed..d183f66 100644
--- a/ansible/roles/recorder/tasks/textfile.yml
+++ b/ansible/roles/recorder/tasks/textfile.yml
@@ -1,6 +1,6 @@
 ---
 
-- name: Log room for node_exporter
+- name: log room for node_exporter
   become: yes
   copy:
     content: "room{type=\"{{ room_type }}\",id=\"{{ room_id }}\"} 1\n"
@@ -9,3 +9,12 @@
     group: root
     mode: u=rw,g=r,o=r
 
+- name: save room_type into home
+  copy:
+    content: "{{ room_type }}\n"
+    dest: "/home/opentech/room_type"
+
+- name: save room_id into home
+  copy:
+    content: "{{ room_id }}\n"
+    dest: "/home/opentech/room_id"
diff --git a/ansible/roles/recorder/templates/obs-studio/basic/scenes/event_id.json.j2 b/ansible/roles/recorder/templates/obs-studio/basic/scenes/event_id.json.j2
index 9b1d522..59c92b2 100644
--- a/ansible/roles/recorder/templates/obs-studio/basic/scenes/event_id.json.j2
+++ b/ansible/roles/recorder/templates/obs-studio/basic/scenes/event_id.json.j2
@@ -34,7 +34,7 @@
 {% elif room_type == "setup2" %}
             "device_id": "alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo"
 {% elif room_type == "setup3" %}
-            "device_id": "alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo"
+            "device_id": ""
 {% else %}
             "device_id": "alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo"
 {% endif %}
diff --git a/dashboard.json b/dashboard.json
new file mode 100644
index 0000000..5016a25
--- /dev/null
+++ b/dashboard.json
@@ -0,0 +1,742 @@
+{
+  "__inputs": [
+    {
+      "name": "DS_PROMETHEUS",
+      "label": "Prometheus",
+      "description": "",
+      "type": "datasource",
+      "pluginId": "prometheus",
+      "pluginName": "Prometheus"
+    }
+  ],
+  "__requires": [
+    {
+      "type": "grafana",
+      "id": "grafana",
+      "name": "Grafana",
+      "version": "6.6.2"
+    },
+    {
+      "type": "panel",
+      "id": "heatmap",
+      "name": "Heatmap",
+      "version": ""
+    },
+    {
+      "type": "datasource",
+      "id": "prometheus",
+      "name": "Prometheus",
+      "version": "1.0.0"
+    },
+    {
+      "type": "panel",
+      "id": "table",
+      "name": "Table",
+      "version": ""
+    }
+  ],
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": "-- Grafana --",
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "gnetId": null,
+  "graphTooltip": 0,
+  "id": null,
+  "iteration": 1584259937108,
+  "links": [],
+  "panels": [
+    {
+      "cards": {
+        "cardPadding": null,
+        "cardRound": null
+      },
+      "color": {
+        "cardColor": "#B877D9",
+        "colorScale": "linear",
+        "colorScheme": "interpolateSpectral",
+        "exponent": 0.5,
+        "max": 1,
+        "min": 0,
+        "mode": "opacity"
+      },
+      "dataFormat": "tsbuckets",
+      "datasource": "${DS_PROMETHEUS}",
+      "gridPos": {
+        "h": 13,
+        "w": 6,
+        "x": 0,
+        "y": 0
+      },
+      "heatmap": {},
+      "hideZeroBuckets": false,
+      "highlightCards": true,
+      "id": 3,
+      "interval": "1m",
+      "legend": {
+        "show": true
+      },
+      "options": {},
+      "reverseYBuckets": false,
+      "targets": [
+        {
+          "expr": "(up * on(instance) group_left(nodename) (node_uname_info))",
+          "format": "time_series",
+          "instant": false,
+          "intervalFactor": 1,
+          "legendFormat": "{{nodename}}",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Up",
+      "tooltip": {
+        "show": false,
+        "showHistogram": false
+      },
+      "type": "heatmap",
+      "xAxis": {
+        "show": true
+      },
+      "xBucketNumber": null,
+      "xBucketSize": null,
+      "yAxis": {
+        "decimals": null,
+        "format": "none",
+        "logBase": 1,
+        "max": null,
+        "min": null,
+        "show": true,
+        "splitFactor": null
+      },
+      "yBucketBound": "middle",
+      "yBucketNumber": null,
+      "yBucketSize": null
+    },
+    {
+      "cards": {
+        "cardPadding": null,
+        "cardRound": null
+      },
+      "color": {
+        "cardColor": "#b4ff00",
+        "colorScale": "sqrt",
+        "colorScheme": "interpolateRdYlGn",
+        "exponent": 0.5,
+        "max": 90,
+        "min": 50,
+        "mode": "spectrum"
+      },
+      "dataFormat": "tsbuckets",
+      "datasource": "${DS_PROMETHEUS}",
+      "gridPos": {
+        "h": 13,
+        "w": 6,
+        "x": 6,
+        "y": 0
+      },
+      "heatmap": {},
+      "hideZeroBuckets": false,
+      "highlightCards": true,
+      "id": 2,
+      "interval": "1m",
+      "legend": {
+        "show": true
+      },
+      "options": {},
+      "reverseYBuckets": false,
+      "targets": [
+        {
+          "expr": "avg by (instance) (node_hwmon_temp_celsius{chip=\"platform_coretemp_0\"}) * on(instance) group_left(nodename) (node_uname_info)",
+          "format": "time_series",
+          "instant": false,
+          "intervalFactor": 1,
+          "legendFormat": "{{nodename}}",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Coretemp (℃)",
+      "tooltip": {
+        "show": true,
+        "showHistogram": false
+      },
+      "tooltipDecimals": 1,
+      "type": "heatmap",
+      "xAxis": {
+        "show": true
+      },
+      "xBucketNumber": null,
+      "xBucketSize": null,
+      "yAxis": {
+        "decimals": null,
+        "format": "none",
+        "logBase": 1,
+        "max": null,
+        "min": null,
+        "show": true,
+        "splitFactor": null
+      },
+      "yBucketBound": "middle",
+      "yBucketNumber": null,
+      "yBucketSize": null
+    },
+    {
+      "cards": {
+        "cardPadding": null,
+        "cardRound": null
+      },
+      "color": {
+        "cardColor": "#b4ff00",
+        "colorScale": "sqrt",
+        "colorScheme": "interpolateRdYlGn",
+        "exponent": 0.5,
+        "max": 12,
+        "min": 0,
+        "mode": "spectrum"
+      },
+      "dataFormat": "tsbuckets",
+      "datasource": "${DS_PROMETHEUS}",
+      "gridPos": {
+        "h": 13,
+        "w": 6,
+        "x": 12,
+        "y": 0
+      },
+      "heatmap": {},
+      "hideZeroBuckets": false,
+      "highlightCards": true,
+      "id": 5,
+      "interval": "1m",
+      "legend": {
+        "show": true
+      },
+      "options": {},
+      "reverseYBuckets": false,
+      "targets": [
+        {
+          "expr": "rate(node_disk_written_bytes_total[1m]) / 1024 / 60 * on(instance) group_left(nodename) (node_uname_info)",
+          "instant": false,
+          "legendFormat": "{{nodename}}",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Disk Write (KB/s)",
+      "tooltip": {
+        "show": true,
+        "showHistogram": false
+      },
+      "tooltipDecimals": 1,
+      "type": "heatmap",
+      "xAxis": {
+        "show": true
+      },
+      "xBucketNumber": null,
+      "xBucketSize": null,
+      "yAxis": {
+        "decimals": null,
+        "format": "none",
+        "logBase": 1,
+        "max": null,
+        "min": null,
+        "show": true,
+        "splitFactor": null
+      },
+      "yBucketBound": "middle",
+      "yBucketNumber": null,
+      "yBucketSize": null
+    },
+    {
+      "cards": {
+        "cardPadding": null,
+        "cardRound": null
+      },
+      "color": {
+        "cardColor": "#b4ff00",
+        "colorScale": "sqrt",
+        "colorScheme": "interpolateRdYlGn",
+        "exponent": 0.5,
+        "max": 0,
+        "min": -75,
+        "mode": "spectrum"
+      },
+      "dataFormat": "tsbuckets",
+      "datasource": "${DS_PROMETHEUS}",
+      "gridPos": {
+        "h": 13,
+        "w": 6,
+        "x": 18,
+        "y": 0
+      },
+      "heatmap": {},
+      "hideZeroBuckets": false,
+      "highlightCards": true,
+      "id": 6,
+      "interval": "1m",
+      "legend": {
+        "show": true
+      },
+      "options": {},
+      "reverseYBuckets": false,
+      "targets": [
+        {
+          "expr": "-node_filesystem_avail_bytes{mountpoint=\"/\"} / 1024 / 1024 / 1024 * on(instance) group_left(nodename) (node_uname_info)",
+          "format": "time_series",
+          "instant": false,
+          "legendFormat": "{{nodename}}",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Disk Available (GB)",
+      "tooltip": {
+        "show": true,
+        "showHistogram": false
+      },
+      "tooltipDecimals": 1,
+      "type": "heatmap",
+      "xAxis": {
+        "show": true
+      },
+      "xBucketNumber": null,
+      "xBucketSize": null,
+      "yAxis": {
+        "decimals": null,
+        "format": "none",
+        "logBase": 1,
+        "max": null,
+        "min": null,
+        "show": true,
+        "splitFactor": null
+      },
+      "yBucketBound": "middle",
+      "yBucketNumber": null,
+      "yBucketSize": null
+    },
+    {
+      "cards": {
+        "cardPadding": null,
+        "cardRound": null
+      },
+      "color": {
+        "cardColor": "#5794F2",
+        "colorScale": "linear",
+        "colorScheme": "interpolateGreens",
+        "exponent": 0.5,
+        "max": 0,
+        "min": -100,
+        "mode": "opacity"
+      },
+      "dataFormat": "tsbuckets",
+      "datasource": "${DS_PROMETHEUS}",
+      "gridPos": {
+        "h": 13,
+        "w": 6,
+        "x": 0,
+        "y": 13
+      },
+      "heatmap": {},
+      "hideZeroBuckets": false,
+      "highlightCards": true,
+      "id": 7,
+      "interval": "1m",
+      "legend": {
+        "show": true
+      },
+      "options": {},
+      "reverseYBuckets": false,
+      "targets": [
+        {
+          "expr": "node_wifi_station_signal_dbm * on(instance) group_left(nodename) (node_uname_info)",
+          "format": "time_series",
+          "instant": false,
+          "intervalFactor": 1,
+          "legendFormat": "{{nodename}}",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "WiFi RSSI (dBm)",
+      "tooltip": {
+        "show": true,
+        "showHistogram": false
+      },
+      "type": "heatmap",
+      "xAxis": {
+        "show": true
+      },
+      "xBucketNumber": null,
+      "xBucketSize": null,
+      "yAxis": {
+        "decimals": null,
+        "format": "none",
+        "logBase": 1,
+        "max": null,
+        "min": null,
+        "show": true,
+        "splitFactor": null
+      },
+      "yBucketBound": "middle",
+      "yBucketNumber": null,
+      "yBucketSize": null
+    },
+    {
+      "cards": {
+        "cardPadding": null,
+        "cardRound": null
+      },
+      "color": {
+        "cardColor": "#b4ff00",
+        "colorScale": "sqrt",
+        "colorScheme": "interpolateRdYlGn",
+        "exponent": 0.5,
+        "max": 9,
+        "min": 0,
+        "mode": "spectrum"
+      },
+      "dataFormat": "tsbuckets",
+      "datasource": "${DS_PROMETHEUS}",
+      "gridPos": {
+        "h": 13,
+        "w": 6,
+        "x": 6,
+        "y": 13
+      },
+      "heatmap": {},
+      "hideZeroBuckets": false,
+      "highlightCards": true,
+      "id": 8,
+      "interval": "1m",
+      "legend": {
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