- on Education & Information
- Published in issue 12/2010 on page 37
RS485 Interface Extension
E-Labs Inside section
The central heating meter described elsewhere in this issue is a clever device that can help you keep on top of your fuel bills by measuring the number of kilowatt-hours actually delivered by the heating system. As described in the article, it does this using just four temperature sensors attached to the central heating pipework. Here are mods to the circuit to make it full duplex compatible.