//Impact Force Plate with the SparkFun OpenScale!
//This code was written by Jennifer Fox <jenfoxbot@gmail.com>
//Many thanks to the folks at ThingSpeak and The MathWorks, Inc. for the ThingSpeak code examples!
//Many thanks to SparkFun + N. Seidle for the OpenScale code examples!
/*
* ----------------------------------------------------------------------------
* "THE COFFEE-WARE LICENSE" (Revision 42):
* <jenfoxbot@gmail.com> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a coffee (or a beer!) in return.
* ----------------------------------------------------------------------------
*/
//Include libraries
#include "ThingSpeak/ThingSpeak.h"
//Set up variable for local time -- adjust for your timezone
int local_hour_offset = 9; //PST time is 9 hours off GMT
/* Set up ThingSpeak Channel -- IMPORTANT: Change ssid[], pass[], myChannelNumber, and myWriteAPIKey
-------------------------------------------------------------------------------------------------------
From ThingSpeak: This example selects the correct library to
use based on the selected board. Yun, Wired Ethernet shield,
wi-fi shield, esp8266, and Spark are all supported. With Uno and
Mega, the default is that you're using a wired ethernet shield.
Visit https://www.thingspeak.com to sign up for a free account
and create a channel.
*/
#ifdef SPARK
#include "ThingSpeak/ThingSpeak.h"
#else
#include "ThingSpeak.h"
#endif
//#define USE_WIFI_SHIELD
#ifdef ARDUINO_ARCH_AVR
#ifdef ARDUINO_AVR_YUN
#include "YunClient.h"
YunClient client;
#else
#ifdef USE_WIFI_SHIELD
#include <SPI.h>
// ESP8266 USERS -- YOU MUST COMMENT OUT THE LINE BELOW (due to bug).
// If you get "multiple definition of `WiFi'" -- comment out the line below.
#include <WiFi.h>
char ssid[] = "SSID"; // <-------------------- CHANGE THIS to your network SSID (name)
char pass[] = "PASSWORD"; // <-------------------- CHANGE THIS to your network password
int status = WL_IDLE_STATUS;
WiFiClient client;
#else
// Use wired ethernet shield
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
EthernetClient client;
#endif
#endif
#endif
#ifdef ARDUINO_ARCH_ESP8266
#include <ESP8266WiFi.h>
char ssid[] = "SSID"; // <-------------------- CHANGE THIS to your network SSID (name)
char pass[] = "PASSWORD"; // <-------------------- CHANGE THIS to your network password
int status = WL_IDLE_STATUS;
WiFiClient client;
#endif
#ifdef SPARK
TCPClient client;
#endif
/*
Change these two variables to your channel number, and your write API key.
IF YOU SHARE YOUR CODE, BE SURE TO REMOVE YOUR WRITE API KEY!!
*/
unsigned long myChannelNumber = NUMBER_HERE; // <----------------- CHANGE THIS to your channel number
const char * myWriteAPIKey = "API_KEY_HERE"; // <----------------- CHANGE THIS to your write API key
//---------- Set up the Photon ---------------------------------------------------------------------------------------
void setup() {
Wire.setSpeed(CLOCK_SPEED_100KHZ); //Default
Wire.begin();
Serial.begin(9600); //Debug terminal
Serial1.begin(9600); //TX/RX from OpenScale
//Set up the ThingSpeak channel
#if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_ESP8266)
#ifdef ARDUINO_AVR_YUN
Bridge.begin();
#else
#if defined(USE_WIFI_SHIELD) || defined(ARDUINO_ARCH_ESP8266)
WiFi.begin(ssid, pass);
#else
Ethernet.begin(mac);
#endif
#endif
#endif
ThingSpeak.begin(client);
}
//---------- Photon Program loop -----------------------------------------------------------------------------------
void loop() {
//Check the weight
float weightLBS = readWeight();
//Figure out the local time including DST, not UTC
//Currently unused
String localTime = calcLocalTime();
char tempStr[64];
localTime.toCharArray(tempStr, 64);
// Read in the TX data and push to the client
//TO PUSH MORE DATA TO THINGSPEAK: repeat lines 129 and 132 for each field, changing the variable name
Serial.print("Weight:"); Serial.println(weightLBS, 2);
Serial.println();
ThingSpeak.setField(1,weightLBS);
// Write the fields that you've set all at once.
ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
delay(1000); // Delay affects the serial monitor output only. ThingSpeak will only accept updates every 15 seconds.
}
//----- Function to read weight from the OpenScale -- many thanks to N. Seidle for the function code! ----------------
float readWeight()
{
int timeOut = 2000; //Number of miliseconds before giving up
int counter;
//Clear out any trash in the buffer
while(Serial1.available()) Serial1.read();
//Send any character to trigger a read
Serial1.print('.');
//Now we need to spin to the first comma after the time stamp
counter = 0;
while(Serial1.read() != ',')
{
if(counter++ == timeOut) return(0); //Error
delay(1);
}
//Now we read the weight
counter = 0;
String weightStr;
while(1)
{
if(Serial1.available())
{
char incoming = Serial1.read();
if(incoming == ',')
{
//We're done!
return(weightStr.toFloat());
}
else
{
weightStr.concat(String(incoming));
}
}
if(counter++ == timeOut) return(0); //Error
delay(1);
}
}
//----- Calculate local time -- many thanks to N. Seidle for the function code! --------------------------------------
String calcLocalTime()
{
//Get the time that this measurement was taken
int hour = Time.hour(); //Most of the work will be on the current hour
//Since 2007 DST starts on the second Sunday in March and ends the first Sunday of November
//Let's just assume it's going to be this way for awhile (silly US government!)
//Example from: http://stackoverflow.com/questions/5590429/calculating-daylight-savings-time-from-only-date
bool dst = false; //Assume we're not in DST
if(Time.month() > 3 && Time.month() < 11) dst = true; //DST is happening!
int DoW = Time.weekday() - 1; //Get the day of the week. 0 = Sunday, 6 = Saturday
//In March, we are DST if our previous Sunday was on or after the 8th.
int previousSunday = Time.day() - DoW;
if (Time.month() == 3)
{
if(previousSunday >= 8) dst = true;
}
//In November we must be before the first Sunday to be dst.
//That means the previous Sunday must be before the 1st.
if(Time.month() == 11)
{
if(previousSunday <= 0) dst = true;
}
if(dst == true) hour++; //If we're in DST add an extra hour
//Convert UTC hours to local current time using local_hour
if(hour < local_hour_offset)
hour += 24; //Add 24 hours before subtracting local offset
hour -= local_hour_offset;
String AMPM = "AM";
if(hour > 12)
{
hour -= 12; //Get rid of military time
AMPM = "PM";
}
if(hour == 12) AMPM = "PM"; //Noon correction
if(hour == 0) hour = 12; //Mid-night correction
//Stick all the parts together
//Would be nice to do a sprintf for the entire thing but sprintf doesn't like %3A colons
String prettyTime;
char part[2];
sprintf(part, "%02d", hour);
prettyTime.concat(part);
prettyTime.concat("%3A");
sprintf(part, "%02d", Time.minute());
prettyTime.concat(part);
prettyTime.concat("%3A");
sprintf(part, "%02d", Time.second());
prettyTime.concat(part);
prettyTime.concat(" ");
prettyTime.concat(AMPM);
return(prettyTime);
}