Data not plotting in bolt cloud via UART

Development Uart Communication
1

I am trying to send the value of the LM35 sensor to the bolt cloud using UART communication. I have an Arduino UNO to which LM35 is connected at A0 pin. I am using the BoltIoT-Arduino-Helper.h library but the values are not showing. Upon downloading the CSV file I am only able to see RD as a variable value. I have checked the same on the forum but didn’t get any solution. This is a part of a bigger project that I am working on, so I don’t want to attach the sensor directly to the Bolt development board.

Here’s my Arduino Code :

#include <BoltIoT-Arduino-Helper.h>

#ifndef API_KEY
#define API_KEY   "xxxxxxxx"
#endif
#ifndef DEVICE_ID
#define DEVICE_ID "BOLTxxxx"
#endif


void setup() {
  // put your setup code here, to run once:
  boltiot.begin(Serial);
  pinMode(A0,INPUT);
}

void loop() {
  boltiot.processPushDataCommand(analogRead(A0));
  delay(1000);
}

I have tried using CheckPoll command also but no luck there too.
Here is the code of cloud dashboard:

setChartLibrary('google-chart');
setChartTitle('Your Graph Title');
setChartType('lineGraph');
setAxisName('X-Axis Name','Y-axis Name');
mul(0.0977);
plotChart('time_stamp','var0');

And here’s the graph:

Screenshot 2021-07-22 at 7.40.31 PM
Screenshot 2021-07-22 at 7.40.31 PM2654×1282 175 KB

Thanks in advance.

2

You have connected serial pins of arduino with bolt right?

3

Yes I have
Tx -> Rx and Rx -> Tx

4

What about GND pin ??

5

Yeah ! It works. Completely forgot about that.
Thanks

1 Like
6

Now If I have multiple sensor values then can I pass those values in the same push data command or I have to call it separately for each value.
Also, Can I plot all values on the same graph?

1 Like
7

For that use the command handler. Need a trial script?

8

Alright. Yeah sure it will be helpful.

9

You want to visualize directly to the cloud only right? Then use the same command, and separate the sensor readings with comma.

Like
boltiot.processPushDataCommand(analo...(A0), analo...(A1), analo...(A2), analo...(A3));

Make sure while creating the product in the hardware configuration, mention 4 CSV inputs for above case.

10

Yeah, both to the cloud and python script. For visualisation, do I have to like make 4 different graphs or is there a way to plot the values on same graph ?

11

For 4 values on same graph, table and line graph gives the flexibility. Check below sample -

setChartLibrary('google-chart');
setChartTitle('Your Graph Title');
setChartType('lineGraph');
setAxisName('X-Axis Name','Y-axis Name');
mul(0.0977);
plotChart('time_stamp','var0', 'var1', 'var2', 'var3');

You can do 4 different graphs as well. Sample -

var Graph1 = new boltGraph();
Graph1.setChartType("lineGraph");
Graph1.setAxisName('X-Axis Name','Y-axis Name');
Graph1.plotChart('time_stamp','var0');
var Graph2 = new boltGraph();
Graph2.setChartType("steppedGraph");
Graph2.setAxisName('X-Axis Name','Y-axis Name');
Graph2.plotChart('time_stamp','var1');
var Graph3 = new boltGraph();
Graph1.setChartType("scatterGraph");
Graph1.setAxisName('X-Axis Name','Y-axis Name');
Graph1.plotChart('time_stamp','var2');
var Graph4 = new boltGraph();
Graph2.setChartType("areaGraph");
Graph2.setAxisName('X-Axis Name','Y-axis Name');
Graph2.plotChart('time_stamp','var3');
1 Like
12

For python, refer to this thread -

13

Ok Thanks for your help!

1 Like