FIRMWARE UPLOAD EMONWRT2

Upload Arduino sketch to the EmonWRT2

Required Equipment

• 1 screw driver
• 1 avr Programmer
• A computer running the Arduino IDE

Steps

1/ Disconnect all cables (ethernet power sensors) from the unit.

2/ Open the EmonWRT2 enclosure removing the four screws.

3/ Download and install the Arduino IDE on your computer. https://www.arduino.cc/en/Main/Software

4/ Open the sketch template given on the main EmonWRT2 page.

5/ Modify it to your needs. The main parameters to change are at the top of the sketch.

#define POLLING_INTERVAL  5000

const float ICAL = 83.33;
const double VCAL1 = 273.9;
const double VCAL2 = 269.5;
const double VCAL3 = 271.0;

boolean THREEPHASE = true;

ICAL is the calibration value for the SCT. VCAL are the calibration value for the Voltage sensor. THREPHASE true or false will enable/disable 3 phase output.

6/ Install all required libraries:

One Wire
http://www.pjrc.com/teensy/td_libs_OneWire.html
arduino-tiny core:
http://code.google.com/p/arduino-tiny/
sendonlySoftwareSerial:
http://lechacal.com/RPICT/7CT1V/SendOnlySoftwareSerial.zip

7/ Remove all 6 jumpers from the EmonWRT2 board.

8/ Connect the AVR programmer to the EmonWRT2 board on the FTDI port. Make sure grounds are connected together.

9/ Setup correct serial port and programmer on Arduino IDE. Also make sure that the ATtiny84 @ 8Mhz is selected.

10/ Upload the firmware. Disconnect the avr programmer. Re-install the jumpers. Apply power to the board for testing.