How to Send Arduino Uno+Ethernet Shield Analog Data (A0-A4))to Blynk App

Need Help With My Project
1

Hi Guys,

Please I am new and trying out Blynk example. I want to send my analogue data (dc voltages) on my A0, A1, A2 and A3 to my blynk app. I am using Arduino Uno with Ethernet shield. I have a webserver hosted on my SD card to be shown on a web. please what command should i use to capture thses data from the analog pins?

Also on my blynk app am using the Analog pin A0-A3

2

Reading this, I’m almost sure you totally ignored the docs.blynk.cc and examples.blynk.cc - pages created with a lot of efforts to help all newbies, who I was once either…

2 Likes
3

For read an analog pin, use analogRead(pin), for send the values to blynk use Blynk.virtualWrite(Vpin,value), for more information or examples of use, see the documentation at the links provided by @marvin7

1 Like
4

Thanks alot this was really helpful.

5

Thanks Marvin, am doing just that now and its really of help.

6

Please the data i want to push to the Blynk app is stored on my SD card on the ethernet shield board. see below data on SD card:
function GetArduinoInputs()
{
nocache = “&nocache=” + Math.random() * 1000000;
var request = new XMLHttpRequest();
request.onreadystatechange = function()
{
if (this.readyState == 4) {
if (this.status == 200) {
if (this.responseXML != null) {
data_val = this.responseXML.getElementsByTagName(‘analog’)[0].childNodes[0].nodeValue;
data_val2 = this.responseXML.getElementsByTagName(‘analog’)[1].childNodes[0].nodeValue;
data_val3 = this.responseXML.getElementsByTagName(‘analog’)[2].childNodes[0].nodeValue;
data_val4 = this.responseXML.getElementsByTagName(‘analog’)[3].childNodes[0].nodeValue;
## data_val1 = data_val(23.99/1024.0)4.95;

** data_val2 = data_val2*(24.01 /1024.0)2.31;*

** data_val3 = data_val3*(167.0/1024.0)2.82;*

** data_val4 = data_val4*(167.0/1024.0)2.75;*

}

I would want blynk to display the result “data_val1 to data_val4” from the SD card been displayed on the web to Blynk. Please do you have any idea I can go about it?

7

Put some widgets at app and configure the virtual pin of each…

then when you get the correct values at data_vals… do

Blynk.virtualWrite(V1,data_val1);
Blynk.virtualWrite(V2,data_val2);
Blynk.virtualWrite(V3,data_val3);
Blynk.virtualWrite(V4,data_val4);
8

Thanks so much.