Emonhub interfacer for 'new' emontx serial format

glyn.hudson · 14 March 2017 23:55

The ‘standard’ serial output of the emonTx never worked with emonHub. The emonhub serial interfacer requires data in the format: ``NODEID VAR1 VAR2 VAR3

It’s easy enough to generate that serial output using the following in the emonTx sketch:

Serial.print((int)(realPower1)); Serial.print(' ');   // These for compatibility, but whatever you need if emonHub is configured to suit.
Serial.print((int)(realPower2)); Serial.print(' ');
Serial.print((int)(realPower3)); Serial.print(' ');
Serial.print((int)(realPower4)); Serial.print(' ');
Serial.print((int)(Vrms*100));

If using direct serial most users would want to use the emonTx direct serial sketch which has the RFM disabled.

github.com

openenergymonitor/emonhub/blob/emon-pi/conf/interfacer_examples/directserial/readme.md

Emonhub can read from a serial device directly e.g. `/dev/ttyUSB0`

## Data Format

Data should be printed to serial (integer only) with space sperators in the format:

`NODEID VAR1 VAR2 VAR3` ....and so on

Here is an example of printing data from an Arduino sketch:


```
Serial.print(nodeID);     Serial.print(' ');
Serial.print(realPower1); Serial.print(' ');
Serial.print(realPower2); Serial.print(' ');
Serial.print(realPower3); Serial.print(' ');
Serial.print(realPower4); Serial.print(' ');
Serial.print(Vrms); Serial.println();
```

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No, not yet. but that’s a good idea! Fancy having a go?

The new emonESP compatible format is

name:value name:value

e.g.

ct1:100 ct2:234 temp1:23