| Arduino Forum ::  Members :: TimFr
 Show Posts Pages: [1] 2 3 4
 1 Using Arduino / Programming Questions / Re: help with simple if..then program on: February 15, 2014, 10:31:37 am Code:[code]Thank's Wildbill, I was making things too complicated.I changed the code to if ( (temp >= 60 )  {   digitalWrite(outPin, LOW);   Serial.println("Fan OFF");}  if  ( temp <50 )   {  digitalWrite(outPin, HIGH);    Serial.println("Fan ONN");}[/code]
 3 Using Arduino / Programming Questions / help with simple if..then program on: February 15, 2014, 09:10:36 am I have wired and written a program for temperature control. My aim is to control the fan burner. If fan is on it heats up and if off cools down. My parameters are if hotter than 60°C fan off, cool down to 50°C turn fan back on.However I am getting random switching on and off with my 'Check' flipping around fro 1 to 0 when with in the 50 to 60° range.All help appreciated, Here is my code;Code:#include          //loads the more advanced math functionsint outPin = 13;int Check = 0;  void setup() {            //This function gets called when the Arduino starts Serial.begin(9600);   //This code sets up the Serial port at 115200 baud rate pinMode(outPin, OUTPUT);   //This code sets up the Serial port at 115200 baud rate} double ThermisterHIGH(int RawADC) {  //Function to perform the fancy math of the Steinhart-Hart equation double TempHIGH; TempHIGH = log(((10240000/RawADC) - 10000)); TempHIGH = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * TempHIGH * TempHIGH ))* TempHIGH ); TempHIGH = TempHIGH - 273.15;              // Convert Kelvin to Celsius  return TempHIGH;}double ThermisterLOW(int RawADC) {  //Function to perform the fancy math of the Steinhart-Hart equation double TempLOW; TempLOW = log(((10240000/RawADC) - 10000)); TempLOW = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * TempLOW * TempLOW ))* TempLOW ); TempLOW = TempLOW - 273.15;              // Convert Kelvin to Celsius  return TempLOW;}     void loop() {             //This function loops while the arduino is powered  int valHIGH;                //Create an integer variable  double tempHIGH;            //Variable to hold a temperature value  valHIGH=analogRead(0);      //Read the analog port 0 and store the value in val  tempHIGH=ThermisterHIGH(valHIGH);   //Runs the fancy math on the raw analog value  Serial.print("HIGH");    delay(500);            //Wait half second before getting low value    int valLOW;                //Create an integer variable  double tempLOW;            //Variable to hold a temperature value  valLOW=analogRead(1);      //Read the analog port 0 and store the value in val  tempLOW=ThermisterLOW(valLOW);   //Runs the fancy math on the raw analog value  Serial.print(tempLOW);   //Print the value to the serial port  delay(500);            //Wait half second before getting low value    if ( (Check == 0) && (tempHIGH <= 60 )) {   digitalWrite(outPin, HIGH); Serial.println("Fan ON");Serial.print("check=      ");Serial.println( Check);}  if  ( tempHIGH >= 60 ) {  digitalWrite(outPin, LOW);  Check = 1; Serial.println("Fan OFF");Serial.print("check=      ");Serial.println( Check);}if  ( tempHIGH <= 50 ) {Check = 0;}}
 4 Using Arduino / General Electronics / Re: Reading temperature on: February 15, 2014, 07:16:37 am Sorry for being a bit thick but what does NTC stand for?
 5 Using Arduino / General Electronics / Reading temperature on: February 15, 2014, 07:00:14 am I am trying to record temperature using a thermistor but I am getting a 5°C fluctuation for a non varying set temperature.I have used a 10K Ohm Resistor, would changing this value help? This is how I have set it up
 6 Using Arduino / Installation & Troubleshooting / Upload error on: January 23, 2014, 08:18:48 am When I try to upload I get an error that reads in red text;avrdude: stk500_getsync(): not in sync:  resp=0x30I am a novice with arduino but this my second uno:  I  am using this uno straight out of sealed packaging. Is it faulty or have I forgotten something?All help appreciated.
 7 Using Arduino / Project Guidance / Re: Connecting to GPS antenna on: October 27, 2013, 09:11:01 am Sorry but I am more into programming than elactronics
 8 Using Arduino / Project Guidance / Re: Connecting to GPS antenna on: October 27, 2013, 09:08:10 am I do mean antenna, so do I need a unit in between antenna and PC
 9 Using Arduino / Project Guidance / Re: Connecting to GPS antenna on: October 27, 2013, 09:01:05 am Just checked, I was wrong it has a co-axial connection.
 10 Using Arduino / Project Guidance / Re: Connecting to GPS antenna on: October 27, 2013, 08:46:36 am Yes the Trimble is serial, I was hope to link up to the computer to do some algorithms . May be via the UNO is not the way to go.
 11 Using Arduino / Project Guidance / Connecting to GPS antenna on: October 27, 2013, 08:35:19 am Hi, I don't know if this is the right section of the forum for this post?I have read some where that you cannot connect a gps antenna to a UNO and a computer to the USB port of the UNO at the same time, is this true?Also I have a Trimble antenna that I wish to use, would this be feasible to connect to the UNO?Thank's in advance for any replies.
 12 Using Arduino / General Electronics / Re: Opto couplers and relays - please clarify on: April 22, 2013, 12:59:17 am HI PapuI have recently used the opto coupler that came in the kit. I did not use the arduino as this was a separate project. I was wanting to change a very low amperage 12v supply to a higher amperage 12v. I used the opto with a 220ohms resistor between the +12v low supply and anode. The cathode to 0v. the higher amperage 12v to the collector. With power on the input side the emitter went high 12v.So yes you can use an opto instead of a relay.
 13 Community / Website and Forum / Re: Inserting serial monitor in the forum on: October 30, 2012, 04:37:30 am Quote from: floresta on October 27, 2012, 02:47:28 pmQuoteActually have been programming since I was 9 years old.That really doesn't tell us much.  Does this mean that you remember CP/M? ... Maybe PC-DOS?  Does this mean that you remember that the eight function keys belong at the left end of the keyboard, opposite the numberpad?DonYes I remember now but have been using Windows for too long now
 14 Using Arduino / General Electronics / Re: Hall effect sensors on: October 23, 2012, 02:01:18 am Quote from: jay2012 on October 22, 2012, 01:48:21 pmHey,I suggest that you do not use the attach interrupt function at all,try using the pulseIn function,as what you want the is the pulse,whenever the magnetic fields react with the sensor.What do others think?Is it possible to add another interrupt function, again RPM but for a slow shaft speed (circa 50 to 100 rpm)?
 15 Using Arduino / General Electronics / Re: Hall effect sensors on: October 22, 2012, 01:09:10 am Quote from: robtillaart on October 21, 2012, 12:18:37 pmCan you explain the *4 and the *10 ?    Looking at the code I expected other result (a growing value for smoothrpm).The out put was a 1/4 of the RPM; example Code:rpm 3703   smooth rpm 925so I added *4, the 10 was to try and get an even more average.
 Pages: [1] 2 3 4