Firmware

The emonPi2 firmware can be edited and compiled using PlatformIO (recommended) or Arduino IDE with DxCore installed. DxCore is an Arduino core for the AVR-DB microcontroller range, developed by SpenceKonde.

Available Firmware

EmonPi2_DB_6CT_1phase: Single phase, 6 CT channel, continuous sampling using the new emonLibDB library, cumulative energy persisted to EEPROM, serial configuration and data output. Temperature sensing and radio receiver handled by connected RaspberryPi.
Download: Pre-compiled hex

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EmonPi2_DB_6CT_3phase: Three phase, 6 CT channel, continuous sampling using the new emonLibDB library, cumulative energy persisted to EEPROM, serial configuration and data output. Temperature sensing and radio receiver handled by connected RaspberryPi.
Download: Pre-compiled hex

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EmonPi2_CM_3x_temperature_transmitter: Designed for use when emonPi2 measurement board is used in standalone transmitter mode IF temperature sensing is required. Single phase, 6 CT channel, continuous sampling using the emonLibCM library, cumulative energy persisted to EEPROM, serial configuration and data output. See EmonTx4 DS18B20 Temperature sensing & firmware release 1.5.7 for note on performance implications.
Download: Pre-compiled hex

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EmonPi2_DB_6CT_1phase_with_analog: ANALOG INPUT ENABLED. Single phase, 6 CT channel, continuous sampling using the new emonLibDB library, cumulative energy persisted to EEPROM, serial configuration and data output. Temperature sensing and radio receiver handled by connected RaspberryPi.
Download: Pre-compiled hex

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EmonPi2_DB_6CT_1phase_pulse_on_analog: Pulse input on analog input. Single phase, 6 CT channel, continuous sampling using the new emonLibDB library, cumulative energy persisted to EEPROM, serial configuration and data output. Temperature sensing and radio receiver handled by connected RaspberryPi.
Download: Pre-compiled hex

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EmonPi2_CM_6CT_current_only: 6 CT channel current only firmware for applications without a voltage sensor, continuous sampling using the new emonLibCB library, serial configuration and data output. Temperature sensing and radio receiver handled by connected RaspberryPi.
Download: Pre-compiled hex

Updating firmware

The easiest way of updating the emonPi2 firmware is to use the firmware upload tool.

1. In your local emonPi2 web interface, navigate to: Setup > Admin > Update > Firmware.

2. Select serial port ttyAMA0 and then select emonPi2 from hardware.

3. Select firmware variant as required.

Upload pre-compiled using EmonScripts emonupload2 tool

On the emonPi/emonBase ensure EmonScripts is updated to latest version then run emonupload2 tool

cd /opt/openenergymonitor/EmonScripts
./emonupload2.py

Select hardware then firmware version

Select hardware:
  1. emonPi2
  2. emonTx4
  3. emonPi
  4. emonTx3
  5. rfm69pi
  6. rfm12pi
  7. emonTH2
Enter number:1

Select firmware:
1. EmonPi2_DB_6CT_1phase                   1.0.2      (Standard LowPowerLabs)
2. EmonPi2_DB_6CT_3phase                   1.0.2      (Standard LowPowerLabs)
3. EmonPi2_CM_3x_temperature_transmitter   1.5.7      (Standard LowPowerLabs)
4. EmonPi2_DB_6CT_1phase_with_analog       1.0.3      (Standard LowPowerLabs)
5. EmonPi2_DB_6CT_1phase_pulse_on_analog   1.0.3      (Standard LowPowerLabs)
6. EmonPi2_CM_6CT_current_only             1.0.1      (Standard LowPowerLabs)
Enter number:

emonupload2 tool can also be run on any other linux computer by cloning the EmonScripts repo then running the emonupload2.py python script. Python3 required

git clone https://github.com/openenergymonitor/EmonScripts

Upload pre-compiled manually using avrdude

Alternatively to upload the same pre-compiled firmware via command line on emonPi / emonBase:

avrdude -C/opt/openenergymonitor/EmonScripts/update/avrdude.conf -v -pavr128db48 -carduino -D -P/dev/ttyUSB0 -b115200 -Uflash:w:EmonPi2_DB_6CT_1phase_v1_0_2.ino.hex:i 

Or using different computer, ensure avrdude.conf has avr128db48 entry i.e DxCore see below instructions

avrdude -Cavrdude.conf -v -pavr128db48 -carduino -D -P/dev/ttyUSB0 -b115200 -Uflash:w:EmonPi2_DB_6CT_1phase_v1_0_2.ino.hex:i 

You will need avrdude installed (tested on version 6.3-2017) and the custom DxCore avrdude.conf. This can be downloaded here: DxCore avrdude.conf.

How to compile and upload firmware

Compile and Upload using PlatformIO (recommended)

Clone the emonTx V4 repo

git clone https://github.com/openenergymonitor/emonpi2
cd emonpi2/firmware/EmonPi2_DB_6CT_1phase

Install PlatformIO core then to compile and upload

pio run -t upload

On first run PlatformIO will download automatically all the required libraries. You can also use the PlatformIO GUI.

Compile and Upload using Arduino IDE

If you don’t already have the Arduino IDE it can be downloaded from here:
https://www.arduino.cc/en/software

Once you have the IDE installed, you then need to install Spence Konde’s DxCore. This can be done by first pasting the following board manager URL in Arduino IDE > File > Preferences:

http://drazzy.com/package_drazzy.com_index.json

Then navigating to: Tools > Boards > Boards Manager, Select “DxCore by Spence Konde” and click Install.

For more information on DxCore installation see: https://github.com/SpenceKonde/DxCore/blob/master/Installation.md.

Libraries

Locate or create your Arduino Sketchbook directory (location found in Arduino preferences). If it doesnt already exist, create a directory called libraries in the Sketchbook directory and install the following libraries:

1. Download EmonLibCM library (avrdb branch)
https://github.com/openenergymonitor/EmonLibCM/tree/avrdb

2. Download EmonLibDB library (main branch)
https://github.com/openenergymonitor/emonLibDB

2. Download emonEProm library (avrdb branch)
https://github.com/openenergymonitor/emonEProm/tree/avrdb

3. Download RFM69_LPL library (main branch)
https://github.com/openenergymonitor/RFM69_LPL

4. Download RFM69_JeeLib library (avrdb branch)
https://github.com/openenergymonitor/RFM69_JeeLib/tree/avrdb

5. Download DxCore SpenceKonde OneWire library:
https://github.com/SpenceKonde/OneWire

Compilation settings:

With DxCore and the libraries installed the firmware should then compile.

Under Tools, select the following configuration options:

• Select Board “AVR DB-series (Optiboot)”

• Select Chip: AVR128DB48

• Clock Speed: 24 MHz Crystal

• Bootloader serial port: UART3: TXPB0, RXPB1

Select Board “AVR DB-series (Optiboot)”

Select Chip: AVR128DB48

Bootloader serial port: UART3: TXPB0, RXPB1