Rfm69pi

Hi there. I have an Arduino Uno, with the EmonTX Shield on top of it, transmitting 433MHz. I also have a Raspberry Pi 3, and the SD card from OpenEnergyMonitor. I’m wondering if there is a sample code for the Raspberry Pi, to process the data coming in from the EmonTX, and somehow display that to a user. TIA.

Everything you need software-wise should be on that SD card. If you’re going to connect the Arduino by wires, you need to look at this: EmonTx V3.4 - OpenEnergyMonitor Wiki

If you need to use the RFM radio link, then you will need one of these from the shop: RFM69Pi 433Mhz Raspberry Pi Base Station Transceiver - Shop | OpenEnergyMonitor
to receive the transmissions. It sits on the Pi’s GPIO connector and feeds straight into the Pi.

emonCMS will then provide you with the means to record and display the data.