Simple demo for plotly library
Dependencies: EthernetInterface mbed-rtos mbed plotly
A basic example of streaming data to a chart on plot.ly
Assumes a wired ethernet connection with direct internet access and a DHCP server.
Chart URL and status is output via the usb serial port at 115200.
You will need to modify the plot.ly account information at the start of main.cpp to match your account on http://plot.ly
main.cpp
- Committer:
- AndyA
- Date:
- 2014-07-29
- Revision:
- 1:5e7145bb2184
- Parent:
- 0:c7329ea5d8d5
File content as of revision 1:5e7145bb2184:
#include "mbed.h" #include "EthernetInterface.h" #include "plotly.h" Serial pc(USBTX,USBRX); EthernetInterface eth; // plotly account details const int numberOfTraces = 3; const char PlotlyUsername[] = "YoutUsername"; const char PlotlyAPIToken[] = "YourAPIKey"; const char *PlotlyStreamingTokens[numberOfTraces] = {"YourStreamToken","YourSecondStreamToken"}; // or {"YourStreamToken"} for a single line. Must match numberOfTraces const char PlotlyFileName[] = "Mbed Test Chart"; plotly graph = plotly(PlotlyUsername,PlotlyAPIToken, PlotlyStreamingTokens, PlotlyFileName, numberOfTraces); void plotSetup() { graph.log_level = 1; // turn on status output graph.maxpoints = 72; if (graph.init()) { graph.openStreams(); } } // Generate some simple sample data points void plotGenerateDataPoint() { static float counter = 0; // generate a series of sine waves with slightly different frequencies. for (int i = 0; i < numberOfTraces; i++) { graph.plot(counter, (float)sin(counter * (1-i*0.1)), i); } counter+=0.2; } int main() { pc.baud(115200); pc.printf("Connecting network...\n"); eth.init(); eth.connect(); char *ipAddress = eth.getIPAddress(); if (ipAddress && (strlen(ipAddress) > 4)) { pc.printf("IP Address is %s\n",eth.getIPAddress()); pc.printf("Initalise plot..\n"); plotSetup(); pc.printf("Generating data, press any key to abort.\n"); while (!pc.readable()) { plotGenerateDataPoint(); wait(0.5); } graph.closeStreams(); } else pc.printf("No IP Address\n"); eth.disconnect(); pc.printf("Done\n"); while (1) { wait(10); } }