Ewattch SQUID Sensor

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1

Ask us anything here
https://www.thethingsnetwork.org/marketplace/product/squid-sensor
image

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2

Hi there,

I was wondering if you had a decoder to translate the Ewattch Squid raw payload into usable JSON format?

Thank you
Dylan

3

do you search something like this?

function Decoder(bytes, port) {
	// Decode an uplink message from a buffer
	// (array) of bytes to an object of fields.
	var decoded = {};
	var frame_type= bytes[0] ;
	var payload_size= bytes[1];
	var channel= [0x000000,0x000000,0x000000,0x000000,0x000000,0x000000,0x000000,0x000000,0x000000,0x000000,0x000000,0x000000,0x000000];
	var object_type = bytes[2];
	if (object_type === 0x48) decoded.object_type= "SQUID";
	if (object_type === 0x00) decoded.object_type= "Environnement";
	if (object_type === 0x01) decoded.object_type= "Presence";
	if (object_type === 0x02) decoded.object_type= "Ambience";
	if (object_type === 0x10) decoded.object_type= "Pulse";
	if (object_type === 0x20) decoded.object_type= "TyNess";
	
	if (frame_type === 0x00) //Data sent periodically
	{
		decoded.frame_type= "Data sent periodically";

		var emplacement_byte= 5;
		for (var num_pince=1; num_pince<=12; num_pince++)	{
			channel[num_pince]= bytes[emplacement_byte--] << 16 |bytes[emplacement_byte--] << 8 |bytes[emplacement_byte];	
			channel[num_pince]=channel[num_pince]/100000;
			emplacement_byte += 5;
		}

		decoded.channel_1=channel[1];
		decoded.channel_2=channel[2];
		decoded.channel_3=channel[3];
		decoded.channel_4=channel[4];
		decoded.channel_5=channel[5];
		decoded.channel_6=channel[6];
		decoded.channel_7=channel[7];
		decoded.channel_8=channel[8];
		decoded.channel_9=channel[9];
		decoded.channel_10=channel[10];
		decoded.channel_11=channel[11];
		decoded.channel_12=channel[12];
		
	}
	if (frame_type === 0x01) // data sent during an event
	{
		decoded.frame_type= "data sent during an event";
	}
	if (frame_type === 0x10) // Sensor status data
	{
		decoded.frame_type= "Sensor status data";
		var firmware_version= {
major:bytes[6], 
minor:bytes[5] 
};
		decoded.firmware_version= firmware_version;
		var battery_level= bytes[8] ;
		if (battery_level === 0x08) decoded.battery_level= "Mains power 80%";
		if (battery_level === 0x07) decoded.battery_level= "Mains power 70%";
		if (battery_level === 0x06) decoded.battery_level= "Mains power 60%";
		if (battery_level === 0x05) decoded.battery_level= "Mains power 50%";
		if (battery_level === 0x04) decoded.battery_level= "Middle level 40%";
		if (battery_level === 0x03) decoded.battery_level= "Middle level 30%";
		if (battery_level === 0x02) decoded.battery_level= "Middle level 20%";
		if (battery_level === 0x01) decoded.battery_level= "Level Low 10%";
		if (battery_level === 0x00) decoded.battery_level= "Level critical";
		
		var periodicity = bytes[11] << 8 |bytes[10];
		periodicity=periodicity*10;
		decoded.periodicity= periodicity;
	}

	decoded.payload_size= payload_size;
	return decoded;
}
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4

https://ewattch-documentation.com/?page_id=291

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5

Thanks for sharing the decoder and the documentation!

Just as an aside, in JavaScript one can also use object['attributeName'] instead of object.attributeName. With that, the following would achieve the same for the part that decodes the channel values, without the need for the temporary channel array:

var i = 3;
for (var c = 1; c <= 12; c++) {
  decoded['channel_' + c] =
    (bytes[i++] | bytes[i++] << 8 | bytes[i++] << 16) / 100000;
}
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6

Hello, sorry for my newbie question. Does this thing measure active and reactive components of electrical power? Thanks