Add temp sensors to EmonHP

[glyn.hudson]

@glyn.hudson

I’ll have to check if the RFM69Pi will fit in the emonHP enclosure

Sorry, I’m afraid the RMF69Pi doest fit inside the emonHP enclosure.

However, the new RFM69CW direct to RasPi board that @TrystanLea has been working on should fit, this board is not yet in production, but we may have a few to spare. However, since we’re currently out of stock of emonTH this is not very useful, but will be in the future!

Direct RFM69 to Pi via SPI

So far with both the emonPi and the rfm69pi boards, we’ve interfaced with the RFM69cw radio module via a microcontroller in the middle. Others have however taken a different and simpler approach of linking the Pi to the RFM69cw module directly e.g: rpi-rfm69 · PyPI (wrapper for the low power labs library) With our in progress shift away from using the JeeLib library towards using hardware buffering and a native packet format, the code for reading packets from the module is also much simplified…

It’s also possible to connect a DS18B20 direct to the raspberryPi with the addition of a single resistor:

EmonHub has support for reading direct from DS18B20: emonhub/conf/interfacer_examples/DS18B20 at master · openenergymonitor/emonhub · GitHub