susisstrolch/ems-esp12

EMS Gateway with ESP8266/ESP-12 module

ems-esp12's Issues

sending break on Tx creates Rx noise

Hi there,

firstly thanks for sharing the schematics and parts of the code. I know a lot of time must have gone into designing the board to work with the ESP8266 so really appreciate that, thanks!

I re-created the circuit for my ESP8266 (Nodemcuv2) and the Rx is working perfectly, however, when I send a signal to Tx the Rx picks up noise. Which is pretty annoying if I'm responding to UBA Polls every a few milliseconds. I think you posted a similar issue on https://www.mikrocontroller.net back in January 2015 when you said:

[ 3732.622531 080 2] 10 10 00
[ 3732.634806 080 2] 09 09 00
[ 3732.670815 080 2] 89 89 00
[ 3732.685487 080 2] 90 90 00
[ 3732.726075 080 2] 89 89 00
[ 3732.740234 080 4] 90 00 10 39
[ 3732.768651 080 2] cd cd 00
Momentan gibt es ab und an noch kleine Fehler, hauptsächlich bei den
Poll-Requests. Die Ursache hierfür ist mit hoher Wahrscheinlichkeit eine
zu hochohmige Verbindung zwischem dem LM339 und dem Rx-Eingang des ESP,
bei dem das Signal nicht sauber bis auf GND gezogen wird.
Interessanterweise tritt dieses Problem nur bei "Poll-Requests" auf dem
EMS-Bus auf (Bsp: 90 00 10 39 - Break nicht sauber erkannt).

And I'm curious how you solved it. Would I need to adjust the circuit somehow, or is it my code and just a matter of delaying the Rx after a Tx?

It's driving me nuts - hope you're able to provide a hint or too...

Wich hardware?

Hello what kind of hardware is needed for this??
I've already made the rx/tx circuit from mikrocontroller.net.
Is it possible to direct put rx/tx from that circuit on the ESP8266??

kind regards,

Bert