DS18B20 temperature sensor sends 85 °C error value

[Halsteads (Harley)]

@dBC

Is there no RJ45 jack to plug into?

No, no RJ45 on the emonHD

@dBC

What’s the ribbon connector you refer to?

Sorry, I meant IDC connector. (Old ref to when ribbon cables were used with IDC connectors)

@dBC

And I take it from your fitment of an external pull-up there’s not an internal one?

Correct. Earlier thread has details. Glyn provided good solution.