I've made the OpenTherm Gateway myself. Also programmed the pic myself. Now I want to connect the gateway to the raspberry pi running Domoticz. The raspberry pi is the slave and my nas is the master.
I've changed the refence voltage to 1.458V (VR=4). Now I get no errrors anymore:
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2015-02-22 14:53:00.525 OTGW: SC: 14:53/7
2015-02-22 14:53:00.631 (OpenTherm Gateway) Temp (Control Setpoint)
2015-02-22 14:53:00.651 (OpenTherm Gateway) Thermostat (Room Setpoint)
2015-02-22 14:53:00.669 (OpenTherm Gateway) Temp (Room Temperature)
2015-02-22 14:53:00.688 (OpenTherm Gateway) Temp (Boiler Water Temperature)
2015-02-22 14:53:00.708 (OpenTherm Gateway) Temp (DHW Temperature)
2015-02-22 14:53:00.727 (OpenTherm Gateway) Temp (Outside Temperature)
2015-02-22 14:53:00.747 (OpenTherm Gateway) Temp (Return Water Temperature)
2015-02-22 14:53:00.767 (OpenTherm Gateway) Thermostat (DHW Setpoint)
2015-02-22 14:53:00.785 (OpenTherm Gateway) Thermostat (Max_CH Water Setpoint)
2015-02-22 14:53:30.326 Hardware Monitor: Fetching data (System sensors)
2015-02-22 14:53:30.533 OTGW: SC: 14:53/7
2015-02-22 14:53:30.640 (OpenTherm Gateway) Temp (Control Setpoint)
2015-02-22 14:53:30.659 (OpenTherm Gateway) Thermostat (Room Setpoint)
2015-02-22 14:53:30.678 (OpenTherm Gateway) Temp (Room Temperature)
2015-02-22 14:53:30.697 (OpenTherm Gateway) Temp (Boiler Water Temperature)
2015-02-22 14:53:30.716 (OpenTherm Gateway) Temp (DHW Temperature)
2015-02-22 14:53:30.736 (OpenTherm Gateway) Temp (Outside Temperature)
2015-02-22 14:53:30.766 (OpenTherm Gateway) Temp (Return Water Temperature)
2015-02-22 14:53:30.790 (OpenTherm Gateway) Thermostat (DHW Setpoint)
2015-02-22 14:53:30.825 (OpenTherm Gateway) Thermostat (Max_CH Water Setpoint)
2015-02-22 14:54:00.494 Hardware Monitor: Fetching data (System sensors)
2015-02-22 14:54:00.541 OTGW: SC: 14:54/7
2015-02-22 14:54:00.670 (OpenTherm Gateway) Temp (Control Setpoint)
2015-02-22 14:54:00.702 (OpenTherm Gateway) Thermostat (Room Setpoint)
2015-02-22 14:54:00.749 (OpenTherm Gateway) Temp (Room Temperature)
2015-02-22 14:54:00.769 (OpenTherm Gateway) Temp (Boiler Water Temperature)
2015-02-22 14:54:00.788 (OpenTherm Gateway) Temp (DHW Temperature)
2015-02-22 14:54:00.808 (OpenTherm Gateway) Temp (Outside Temperature)
2015-02-22 14:54:00.828 (OpenTherm Gateway) Temp (Return Water Temperature)
2015-02-22 14:54:00.847 (OpenTherm Gateway) Thermostat (DHW Setpoint)
2015-02-22 14:54:00.865 (OpenTherm Gateway) Thermostat (Max_CH Water Setpoint)
2015-02-22 14:54:30.548 OTGW: SC: 14:54/7
2015-02-22 14:54:30.670 (OpenTherm Gateway) Temp (Control Setpoint)
2015-02-22 14:54:30.699 (OpenTherm Gateway) Thermostat (Room Setpoint)
2015-02-22 14:54:30.723 (OpenTherm Gateway) Temp (Room Temperature)
2015-02-22 14:54:30.762 Hardware Monitor: Fetching data (System sensors)
2015-02-22 14:54:30.758 (OpenTherm Gateway) Temp (Boiler Water Temperature)
2015-02-22 14:54:30.824 (OpenTherm Gateway) Temp (DHW Temperature)
2015-02-22 14:54:30.883 (OpenTherm Gateway) Temp (Outside Temperature)
2015-02-22 14:54:30.943 (OpenTherm Gateway) Temp (Return Water Temperature)
2015-02-22 14:54:31.027 (OpenTherm Gateway) Thermostat (DHW Setpoint)
2015-02-22 14:54:31.085 (OpenTherm Gateway) Thermostat (Max_CH Water Setpoint)
2015-02-22 14:55:00.209 Hardware Monitor: Fetching data (System sensors)
2015-02-22 14:55:00.557 OTGW: SC: 14:55/7
2015-02-22 14:55:00.663 (OpenTherm Gateway) Temp (Control Setpoint)
2015-02-22 14:55:00.682 (OpenTherm Gateway) Thermostat (Room Setpoint)
2015-02-22 14:55:00.700 (OpenTherm Gateway) Temp (Room Temperature)
2015-02-22 14:55:00.720 (OpenTherm Gateway) Temp (Boiler Water Temperature)
2015-02-22 14:55:00.740 (OpenTherm Gateway) Temp (DHW Temperature)
2015-02-22 14:55:00.759 (OpenTherm Gateway) Temp (Outside Temperature)
2015-02-22 14:55:00.778 (OpenTherm Gateway) Temp (Return Water Temperature)
2015-02-22 14:55:00.798 (OpenTherm Gateway) Thermostat (DHW Setpoint)
2015-02-22 14:55:00.816 (OpenTherm Gateway) Thermostat (Max_CH Water Setpoint)
2015-02-22 14:55:30.382 Hardware Monitor: Fetching data (System sensors)