I can’t get it to work, unfortunately, and I don’t know if it’s my pathetic soldering skills or if one of the LEDs or resistors is defective. 
I have already checked my solder joints and the correct position of the anodes/cathodes and collectors/emitters several times (I don’t see any IR signal through my smart phone camera).
Unfortunately I can’t get a device_info read out. Both with KW, and with P300 protocol. And with different positions of the LEDs on the Viessmann connector.
Unfortunately I am at my wit’s end and do not know how I can debug it further better. :-/ Eventually I wait and hope until there maybe the first pre-mounted read heads available.
.::edit::.
I have now added a remote_transmitter for the SIR 204 EVL diode and a remote_receiver for the SFH 309 FA diode for debugging.
remote_receiver:
pin:
number: GPIO3
inverted: True
dump:
- raw
remote_transmitter:
pin: GPIO1
carrier_duty_percent: 50%
switch:
- platform: template
name: "Panasonic TV Off"
turn_on_action:
remote_transmitter.transmit_panasonic:
address: 0x4004
command: 0x100BCBD
repeat:
times: 5
wait_time: 1s
With the smart phone camera I could now also see that the SIR 204 EVL is sending a signal. But the SFH 309 FA seems to receive no signal when I look at the ESP logs. I will now order a new SFH 309 FA and try it again.
Signal on:
Signal off:
Maybe this approach is also helpful for someone else to debug.
Perhaps we should also create a separate thread for OpenV with ESP Home @jota29 ? So that it is better known and we do not spam everything here. 