AVR-DB: emonTx V4, new hardware in progress

We are also gearing up here for the emonPi2 release! Probably around a month away.

The emonPi2 shares a mostly identical PCB design to the emonTx4. The only difference is the layout of the board, RaspberryPi GPIO header, OLED display connector and RJ45 rather than RJ11 emonVs connector for more power carrying capability needed for the RaspberryPi. This allows for a single enclosure design that integrates the RaspberryPi base station.

Features:

  • 6x clip-on CT current sensor inputs (suitable for a range of 333mV voltage output CT sensors).
  • emonVs precision voltage sensor and power supply input
  • Full Real/Active power measurement & continuous sampling.
  • Both single and 3 phase support.
  • 2 pluggable terminal block inputs for DS18B20 temperature sensing & pulse counting connected directly to the RaspberryPi GPIO header.
  • 1 pluggable terminal block analogue voltage input.
  • On-board USB to UART converter for easier programming and serial output.
  • 433 MHz RFM69 radio transceiver
  • Standard RaspberryPi GPIO header connection for direct connection to a RaspberryPi
  • Wall-mount aluminium enclosure
  • OLED 128x64 Display
  • Microcontroller: Microchip AVR128DB48
  • Arduino core support DxCore by SpenceKonde
  • ADC Resolution: 12-bit
  • Precision voltage reference: MCP1502
  • 6 CT Expansion board option as above to increase number of CT inputs to 12. Though only when used with the Pi Zero rather than full Pi 3/4 due to enclosure space constraints.

I’ve added an overview page to the documentation and will be adding to this over the coming weeks in preparation for the release:

https://docs.openenergymonitor.org/emonpi2/overview.html

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