diff --git a/README.md b/README.md
index 7b34082..afe4418 100644
--- a/README.md
+++ b/README.md
@@ -20,3 +20,42 @@ For scanning run visudo and add to the sudoers file:
 ```
 mt	ALL=(ALL) NOPASSWD: /usr/bin/scanimage
 ```
+
+
+# Installation
+
+Software dependencies:
+
+- python3
+- pipenv
+- usbrelay
+- autossh
+
+Python deps:
+
+```bash
+pipenv install
+```
+
+## Usbrelay
+
+When installing usbrelay
+
+```
+apt install usbrelay
+```
+
+And set udev rules to access the device by anyone, according to usbrelay docs:
+
+```
+SUBSYSTEM=="usb", ATTR{idVendor}=="16c0",ATTR{idProduct}=="05df", MODE="0666"
+KERNEL=="hidraw*", ATTRS{busnum}=="1", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05df", MODE="0666"
+```
+
+into `/etc/udev/rules.d/50-dct-tech-usb-relay-2.rules` and then reload rules:
+
+```bash
+sudo udevadm control --reload-rules && sudo udevadm trigger
+```
+
+
diff --git a/sorteerhoed/central_management.py b/sorteerhoed/central_management.py
index d37e4cd..2ae06b6 100644
--- a/sorteerhoed/central_management.py
+++ b/sorteerhoed/central_management.py
@@ -143,13 +143,15 @@ class CentralManagement():
                 elif signal.name == 'server.open':
                     self.currentHit.open_page_at = datetime.datetime.utcnow()
                     self.store.saveHIT(self.currentHit)
-                    # TODO: turn on light!
+                    self.setLight(True)
+                    
                 elif signal.name == 'server.submit':
                     self.currentHit.submit_page_at = datetime.datetime.utcnow()
                     self.store.saveHIT(self.currentHit)
                     self.plotter.park()
-                    # TODO: turn off light!
-                    # park should alway triggers a plotter.finished after being processed
+                    self.setLight(False)
+                    # park always triggers a plotter.finished after being processed
+                    
                 elif signal.name[:4] == 'sqs.':
                     if signal.params['event']['HITId'] != self.currentHit.id:
                         self.logger.warning(f"SQS hit.info hit_id != currenthit.id: {signal}, update status for older HIT")
@@ -168,15 +170,20 @@ class CentralManagement():
                         # {'event': {'HITGroupId': '301G7MYOAJ85NEW128ZDGF5DSBW53S', 'EventType': 'AssignmentAccepted', 'EventTimestamp': '2019-10-23T20:16:10Z', 'HITId': '3IH9TRB0FBAKKZFP3JUD6D9YWQ1I1F', 'AssignmentId': '3BF51CHDTWLN3ZGHRKDUHFKPWIJ0H3', 'WorkerId': 'A1CK46PK9VEUH5', 'HITTypeId': '3EYXOXDEN7RX0YSMN4UMVN01AYKZJ0'}}
                     elif signal.name == 'sqs.AssignmentAbandoned':
                         self.logger.info(f'Set status progress to abandoned')
+                        #{'event': {'HITGroupId': '301G7MYOAJ85NEW128ZDGF5DSBW53S', 'EventType': 'AssignmentAbandoned', 'EventTimestamp': '2019-10-23T20:23:06Z', 'HITId': '3JHB4BPSFKKFQ263K4EFULI3LC79QJ', 'AssignmentId': '3U088ZLJVL450PB6MJZUIIUCB6VW0Y', 'WorkerId': 'A1CK46PK9VEUH5', 'HITTypeId': '3EYXOXDEN7RX0YSMN4UMVN01AYKZJ0'}}
                         sqsHit.accept_time = None
                         sqsHit.open_page_at = None
                         self.reset()
-                        #{'event': {'HITGroupId': '301G7MYOAJ85NEW128ZDGF5DSBW53S', 'EventType': 'AssignmentAbandoned', 'EventTimestamp': '2019-10-23T20:23:06Z', 'HITId': '3JHB4BPSFKKFQ263K4EFULI3LC79QJ', 'AssignmentId': '3U088ZLJVL450PB6MJZUIIUCB6VW0Y', 'WorkerId': 'A1CK46PK9VEUH5', 'HITTypeId': '3EYXOXDEN7RX0YSMN4UMVN01AYKZJ0'}}
+                        if updateStatus:
+                            self.setLight(False)
+                                                    
                     elif signal.name == 'sqs.AssignmentReturned':
                         self.logger.info(f'Set status progress to returned')
                         sqsHit.accept_time = None
                         sqsHit.open_page_at = None
                         self.reset()
+                        if updateStatus:
+                            self.setLight(False)
                         # {'event': {'HITGroupId': '301G7MYOAJ85NEW128ZDGF5DSBW53S', 'EventType': 'AssignmentReturned', 'EventTimestamp': '2019-10-23T20:16:47Z', 'HITId': '3IH9TRB0FBAKKZFP3JUD6D9YWQ1I1F', 'AssignmentId': '3BF51CHDTWLN3ZGHRKDUHFKPWIJ0H3', 'WorkerId': 'A1CK46PK9VEUH5', 'HITTypeId': '3EYXOXDEN7RX0YSMN4UMVN01AYKZJ0'}}
                     elif signal.name == 'sqs.AssignmentSubmitted':
                         # {'MessageId': '4b37dfdf-6a12-455d-a111-9a361eb54d88', 'ReceiptHandle': 'AQEBHc0yAdIrEmAV3S8TIoDCRxrItDEvjy0VQko56/Lb+ifszC0gdZ0Bbed24HGHZYr5DSnWkgBJ/H59ZXxFS1iVEH9sC8+YrmKKOTrKvW3gj6xYiBU2fBb8JRq+sEiNSxWLw2waxr1VYdpn/SWcoOJCv6PlS7P9EB/2IQ++rCklhVwV7RfARHy4J87bjk5R3+uEXUUi00INhCeunCbu642Mq4c239TFRHq3mwM6gkdydK+AP1MrXGKKAE1W5nMbwEWAwAN8KfoM1NkkUg5rTSYWmxxZMdVs/QRNcMFKVSf1bop2eCALSoG6l3Iu7+UXIl4HLh+rHp4bc8NoftbUJUii8YXeiNGU3wCM9T1kOerwYVgksK93KQrioD3ee8navYExQRXne2+TrUZUDkxRIdtPGA==', 'MD5OfBody': '01ccb1efe47a84b68704c4dc611a4d8d', 'Body': '{"Events":[{"Answer":"<?xml version=\\"1.0\\" encoding=\\"ASCII\\"?><QuestionFormAnswers xmlns=\\"http://mechanicalturk.amazonaws.com/AWSMechanicalTurkDataSchemas/2005-10-01/QuestionFormAnswers.xsd\\"><Answer><QuestionIdentifier>surveycode<\\/QuestionIdentifier><FreeText>test<\\/FreeText><\\/Answer><\\/QuestionFormAnswers>","HITGroupId":"301G7MYOAJ85NEW128ZDGF5DSBW53S","EventType":"AssignmentSubmitted","EventTimestamp":"2019-10-30T08:01:43Z","HITId":"3NSCTNUR2ZY42ZXASI4CS5YWV0S5AB","AssignmentId":"3ZAZR5XV02TTOCBR9MCLCNQV1XKCZL","WorkerId":"A1CK46PK9VEUH5","HITTypeId":"3EYXOXDEN7RX0YSMN4UMVN01AYKZJ0"}],"EventDocId":"34af4cd7f2829216f222d4b6e66f3a3ff9ad8ea6","SourceAccount":"600103077174","CustomerId":"A1CK46PK9VEUH5","EventDocVersion":"2014-08-15"}'}
@@ -300,3 +307,14 @@ class CentralManagement():
         self.eventQueue.put(Signal('hit.scanned', {'hit_id':self.currentHit.id}))
         self.eventQueue.put(Signal('scan.finished'))
         
+    def setLight(self, on):
+        value = 1 if on else 0
+        cmd = [
+            'usbrelay', f'HURTM_1={value}'
+        ]
+        self.logger.info(f"Trigger light {cmd}")
+        code = subprocess.call(cmd)
+        if code > 0:
+            self.logger.warning(f"Error on light change: {code}")
+        
+