Sorry I’ve been slow to get back to you. I am on vacation and not checking email very often. Thanks for catching those errors. I have updated the code to reflect that you should use pin 2 as shown on the diagram. Please note that pin 2 holds the Arduino interrupt 1.

The way the code works is that we listen to pin 2, and when this pin is set to LOW the interrupt function is triggered, which sets the newData flag to true. When this flag is set to true the Arduino reads the data from the appropriate registers on the mpr121 chip.

Let me know if this works for you.

All the best, Julio

int irqpin = 3; // pin that connects to notifies when data is available from capacitive sensor

void setup(){

// set IRQ pin to input, turn on the pullup resistor, and attach interrupt to pin
pinMode(irqpin, INPUT);
digitalWrite(irqpin, HIGH);
attachInterrupt(1, dataAvailable, FALLING);

The original Bildr tutorial uses digital pin 2 (not 3). And in fact the PNG file you supply with your code also shows digital pin 2 being connceted to the IRQ pin on the breakout board…
Which is the right pin to connect the IRQ pin on the breakout board? Digital 2 or 3?
The Arduino docs also say that interrupt 1 is on pin 3… so should the IRQ pin be connected to pin 3 and not pin 2 as in the diagram?

Regards,
Ravi

I took a look at your code and the main issue was that the library was set to only accept names up to 14 characters long. I have updated the library so that it can accept names that are up to 19 characters (which will accommodate your 16 character names. I am not sure why your second method worked at all. I would have expected it to fail as well.

I tested out registering the resources from your comment and I was able to get it working on my computer. You should download the newest version of the library and give it another try. If it doesn’t work, then send me your full sketch and I will give it another try later this week.

I’ve updated the wiki to reflect the maximum name length so that this is clear in the future. Here is a link to the wiki page that has been updated. https://github.com/julioterra/Arduino_Rest_Server/wiki/Set-Up-RestServer-in-Your-Sketch

Good luck. Julio

void register_rest_server() {
resource_description_t resource_description [6] = {{“285A04B703000013″, false, {-5000, 5000}},
{“28BA06C60300009E”, false, {-5000, 5000}},
{“28FA4DDD030000DE”, false, {-5000, 5000}},
{“284E46DD03000075″, false, {-5000, 5000}},
{“289B20B70300005C”, false, {-5000, 5000}},
{“28DB32B7030000D6″, false, {-5000, 5000}}};
request_server.register_resources(resource_description, 6);
}

This does not work (deviceCount is 6):

void register_rest_server2() {
resource_description_t resource_description [deviceCount];

resource_range_t range;
range.min = -5000;
range.max = 5000;

for (int i = 0; i < deviceCount; i++) {
resource_description_t rd;
String sname = getAddressAsString(i);
sname.toCharArray(rd.name, sizeof(rd.name) );
rd.post_enabled = false;
rd.range = range;
resource_description[i] = rd;
}
request_server.register_resources(resource_description, deviceCount);
}

Why??
The second way of registering works with upt to 2 resources, with more resources the memory is garbled.