% Plot sensors from multiple channels
% Karl Berger
% 27 May 2016

% Channel IDs to read data from
ChannelID1 = 123792;
ChannelID2 = 64954;
ChannelID3 = 88666;
ChannelID4 = 64954;

% Sensor Field IDs
sensorFieldID_Ch1 = 1; 
sensorFieldID_Ch2 = 1;  
sensorFieldID_Ch3 = 1;  
sensorFieldID_Ch4 = 1;

% Names for Channels
nameCh1 = 'Alpha';
nameCh2 = 'Bravo';
nameCh3 = 'Charlie';
nameCh4 = 'Delta';

dataPoints = 100;

% Read time and sensor data for Channel 1
[sensorCh1Data, time] = thingSpeakRead(ChannelID1, 'Fields', sensorFieldID_Ch1, 'NumPoints', dataPoints);

% Read sensor data for Channel 2
sensorCh2Data = thingSpeakRead(ChannelID2, 'Fields', sensorFieldID_Ch2, 'NumPoints', dataPoints);

% Read sensor data for Channel 3
sensorCh3Data = thingSpeakRead(ChannelID3, 'Fields', sensorFieldID_Ch3, 'NumPoints', dataPoints);

% Read sensor data for Channel 4
sensorCh4Data = thingSpeakRead(ChannelID4, 'Fields', sensorFieldID_Ch4, 'NumPoints', dataPoints);

% plot data for each channel against time from Channel 1
thingSpeakPlot(time, [sensorCh1Data, sensorCh2Data, sensorCh3Data, sensorCh4Data], 'ylabel','Temperature (°C)',...
'legend', {nameCh1, nameCh2, nameCh3, nameCh4}, 'Grid', 'on', 'linewidth', 2);