Help! Started using the Ubidots service which seems like a great place for monitoring your IOT devices.
I can get the Photon running with the light sensor demo fine but cant seem to merge my code into it The Code is below, all I am looking to do is detect a microswitch button press and then send that to Ubidots:
// This #include statement was automatically added by the Particle IDE.
#include "HttpClient/HttpClient.h"
// This code is based on the original Http Example by nmattisson, see https://github.com/nmattisson/HttpClient
#include "HttpClient/HttpClient.h"
#include "application.h"
#define VARIABLE_ID "56b89034762542395061c3f1"
#define TOKEN "hvfS6EgvocbmvcyL8bU21KR46IfxTT"
HttpClient http;
int switchPin = D2; // MicroSwitch is connected to D2
int val; //variable for reading the pin status
int buttonState; //variable to hold the button state
unsigned int counter = 0;
char msg[1024];
unsigned int nextTime = 0; // Next time to contact the server
// Headers currently need to be set at init, useful for API keys etc.
http_header_t headers[] = {
{ "Content-Type", "application/json" },
{ NULL, NULL } // NOTE: Always terminate headers will NULL
};
http_request_t request;
http_response_t response;
void setup() {
pinMode(switchPin, INPUT); // Initialize D2 pin as input
buttonState = digitalRead (switchPin); // read the intial state
request.hostname = "things.ubidots.com";
request.port = 80;
request.path = "/api/v1.6/variables/"VARIABLE_ID"/values?token="TOKEN;
Serial.begin(9600);
}
void loop() {
if (nextTime > millis()) {
return;
}
// Read sensor value
{
val = digitalRead(switchPin); //read input value and store it in val
if (val != buttonState); { //the button state has changed!
if (val == LOW) { //check if the button is pressed
counter++; //increment the button presses variable
Serial.println("Sending data ...");
request.body = "{\"value\":" + String(switchPin) + "}";
// Post request
http.post(request, response, headers);
Serial.println(response.status);
Serial.println(response.body);
buttonState = val; //save the new state in our variable
nextTime = millis() + 1000;
}
}
}
}
The code compiles and flashes OK.
Thanks for the help all.
N
Does your code ever go inside the “Read sensor value” part of loop() - it looks like your missing an else.
This semicolon if (val != buttonState);<---- is a typo and means your program will not flow as you expect.
Your posting switchPin, did you mean to post val?
I’m not sure what the point of counter is?
I am not sure exactly what your trying to achieve but I think the logic between buttonState and val needs to be looked at again. Mainly whether buttonState = val; should be inside your if clause.
Can you let us know what your desired behaviour is? i.e. notification every time button state changes/notification every time every time button is pressed/notification every time button is released etc.
Maybe something like this:
void loop() {
if (nextTime <= millis())
{
val = digitalRead(switchPin); //read input value and store it in val
if (val != buttonState) //the button state has changed!
{
if (val == LOW)
{ //check if the button is pressed
counter++; //increment the button presses variable
Serial.println("Sending data ...");
request.body = "{\"value\":" + String(val) + "}";
// Post request
http.post(request, response, headers);
Serial.println(response.status);
Serial.println(response.body);
}
}
buttonState = val; //save the new state in our variable
nextTime = millis() + 1000;
}
}
Needless to say, if the pin you are reading has no supply current it won’t change states when pressed and therefore won’t send the update to Ubidots.
I have a push button connected to D5.
The code below work for me.
// This #include statement was automatically added by the Particle IDE.
#include "HttpClient/HttpClient.h"
#include "application.h"
#define VARIABLE_ID "yourVAR_ID"
#define TOKEN "yourToken"
HttpClient http;
//boolean buttonPush = false;
int buttonValue1 = 0;
int buttonValue2 = 0;
unsigned int nextTime = 0; // Next time to contact the server
// Headers currently need to be set at init, useful for API keys etc.
http_header_t headers[] = {
{ "Content-Type", "application/json" },
{ NULL, NULL } // NOTE: Always terminate headers will NULL
};
http_request_t request;
http_response_t response;
void setup() {
pinMode(D0, INPUT);
pinMode(D5, OUTPUT);
digitalWrite(D5, HIGH);
request.hostname = "things.ubidots.com";
request.port = 80;
request.path = "/api/v1.6/variables/"VARIABLE_ID"/values?token="TOKEN;
Serial.begin(9600);
}
void loop() {
buttonValue1 = digitalRead(D0);
if (buttonValue1 != buttonValue2) {
Serial.println("Sending data ...");
request.body = "{\"value\":" + String(buttonValue1) + "}";
buttonValue2 = buttonValue1;
// Post request
http.post(request, response, headers);
Serial.println(response.status);
Serial.println(response.body);
return;
}
nextTime = millis() + 1000;
}
You either hard wire it to 3V3 or GND or use a seperate supplyPin, but usually option one is the easiest and common one and most likely the option the OP has chosen.
