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SparkCore 433Mhz RF Remote Control

This is a port of the Arduino library nexa_node to SparkCore. Makes it possible to send and receive commands to/from Nexa brand power plugs, motion sensors, remote controls, etc. In combination with the SparkCore's built-in cloud features one essentially out-of-the-box get features similar to Tellstick and Nexa Gateway - at a fraction of the cost.

Nexa brand devices are widely available, sold at E.G. Clas Ohlson stores throughout Scandinavia.

Operation

Get latest Nexa command

$ curl  -H "Authorization: Bearer d586ffffd4334d84f4199fa1517cc5bdf02c66e9" \
"https://api.spark.io/v1/devices/core_name/command"
{
  "cmd": "VarReturn",
  "name": "command",
  "result": "2:D38EB8:0:2:1",
  "coreInfo": {
    "last_handshake_at": "2015-01-04T18:43:21.222Z",
    "connected": true
  }
}

The command was a request to turn on a power plug - trailing :1

Send a Nexa command

$ curl -H "Authorization: Bearer d586ffffd4334d84f4199fa1517cc5bdf02c66e9" \
https://api.spark.io/v1/devices/core_name/send -d "args=2:D38EB8:0:2:0"
{
  "id": "ffff6c066672524845333456",
  "name": "core_name",
  "last_app": null,
  "connected": true,
  "return_value": 1
}

Power plug ordered to turn off - trailing :0

Serial

Received Nexa commands are echoed on the Serial interface. Commands entered through serial are sent. ##Hardware setup

  1. Sparkcore
  2. 433Mhz RF receiver, model RWS-371
  3. 433Mhz RF transmitter

alt text

N.B. Wrt. the 5V receiver module - the SparkCore, though beeing a 3.3V device, has some 5V-tolerant input pins and can also supply 5V through Vin.

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Spark Core support for Nexa 433 Mhz devices

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