ADXL345 accelerometer - data event #1303
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Hi @alex-def. The ADXL345 has "data" and "change" events implemented. I just gave them a quick try on a BeagleBone Black and they functioned correctly without any issues. What have you tried and what were the problems? |
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Hi Brian, I'm using johnny-five over node-red on a raspberry pi zero. I want to get x/y data from accelerometer every second (use 10 sec on my exemple) that why i use data "event". Regarding node-red console.log, i can see x/y data but it's don't appear every 10 sec. Lots of logs every sec then pause then logs every sec ..... Also if i use change "event" i ve some latency on displaying log, if i move accelerometer i ve to wait arround 10,15 sec to see log. I use the following part of code: Here node-red code:
Hope you have all necessary infos. Thks |
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The I'm not familiar with Node-RED so I'm guessing that you took the formatted JavaScript code posted above, modified it a little, and mapped it to the unformatted Node-RED code also posted in the above post. if this is the case, perhaps the following code or a variant thereof could be used with Node-RED var five = require('johnny-five');
var RaspiIO = require('raspi-io');
var board = new five.Board({
io: new RaspiIO()
});
board.on('ready', function() {
var accelerometer = new five.Accelerometer({
controller: "ADXL345"
});
setInterval(function () {
var d = new Date();
console.log("[" + d.toLocaleTimeString() + "] x: ", accelerometer.x, "| y: ", accelerometer.y );
}, 1000);
});This program prints the x/y data from the accelerometer to the console once per second without using any events. |
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@alex-def One additional point. Above you mention a lag of 10 to 15 seconds when displaying results if the
This is highly likely to be related to the way |
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Hi, I've found a way to bypass event data and setInterval func by using this code into onReady func: Here my node-red code block:
Thks for your help :) |
I'm not 100% sure what func is being referred to here. setInterval or the event handler.
But the data event does work with Node-RED. The event handler for the data event resulted in a huge amount of information being logged to the console as shown in a post above. This is the correct behavior. Granted, it's not what you wanted, but that's a different issue. On the other hand, it's good to hear that things are somehow working now. |
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Thanks @fivdi!
This is 100% correct! It looks like the description of the
var accelerometer = new five.Accelerometer({
controller: "ADXL345"
});
setInterval(() => {
console.log(accelerometer.x, accelerometer.y);
}, 10000); // 10 seconds |
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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. |
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Hello,
Regarding API (http://johnny-five.io/api/accelerometer/#events) , i would like to use data "event" on ADXL345 accelerometer but it don't seems to be implemented.
In fact if i look into code (https://github.com/rwaldron/johnny-five/blob/master/lib/accelerometer.js) there is no trace of "freq".
Is it plan to develop this functionality ?
Thks
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