The Serial.write(buf, length) function sends your data as bytes. It sounds like you want to send your data as ASCII so that a serial terminal will display strings like '55'. For that you need to use Serial.print(n, HEX) in a loop to process your buffer. Note when you send a byte with Serial.write it...

The thermostat is not battery operated it is a OpenTherm version, of you close the contacts on an OpenTherm boiler you will probably kill the boiler print. It is indeed a OpenTherm unit, hence the text modulation on the front plate. You should get yourself an OpenTherm gateway which is placed in bet...

My clocks use the ESP's built-in NTP service, plus the TimeZone library to map to an appropriate local time. It pretty much Just Works if you follow the various examples. Keeping the ESP clock in UTC time and mapping to local time is the easiest way to solve the whole DST problem (and it's the same ...