I'm kind of stuck with strange behaviour of my code and I really hope, someone could help me..
Objective I'm trying to build a (multiple) magnetic stirring device with which I can either control the speed via potentiometer or via serial commands from a python script from pc (usb). When the speed is set via serial, it shouldn't be possible to interfere with the potentiometer unless a button is pressed to unlock it.
Code
// Constants const int FanPin[7] = {2,3,5,6,7,8,9}; // PWM Pins 2,3,5,6,7,8,9 for fan const int PotiPin[7] = {A0,A1,A2,A3,A4,A5,A6}; // Analoge Pins 0,1,2,3,4,5,6 for potentiometers const int SwitchPin[7] = {30,31,32,33,34,35,36}; // Digital Pins 30, 31, 32, 33, 34, 35, 36 for switches // Variables boolean ManualLock = false; // will be true if locked by serial input int Fan[7][2] = { // [x][] for number of fan, [][0] for fan speed, [][1] for ManualLock {0, ManualLock}, {1, ManualLock}, {2, ManualLock}, {3, ManualLock}, {4, ManualLock}, {5, ManualLock}, {6, ManualLock} }; int temp = 0; // Variable for temporary data int FanSpeed[7] = {0,0,0,0,0,0,0}; // Variable fan speed int PotiVar[7] = {0,0,0,0,0,0,0} ; // Variable for saving poti-input byte bfr[2] = {7,7}; // Buffer for serial data void setup() { TCCR2B = TCCR2B & 0b11111000 | 0x01; // Timer2 (Pin 9, 10) @ 31000Hz TCCR3B = TCCR3B & 0b11111000 | 0x01; // Timer3 (Pin 2, 3 und 5) @ 31000Hz TCCR4B = TCCR4B & 0b11111000 | 0x01; // Timer4 (Pin 6, 7 und 8) @ 31000Hz Serial.begin(9600); delay(100); // Declaration of Pin Modes for (int i = 0; i < 7; i++){ pinMode(FanPin[i], OUTPUT); pinMode(PotiPin[i], INPUT); pinMode(SwitchPin[i], INPUT); } } void loop() { for (int i = 0; i < 7; i++){ // ManualLock not active -> manual mode if (!Fan[i][1]){ //Serial.print(i); //Serial.println(" ManualLock not active"); PotiVar[i] = analogRead(PotiPin[i]); Fan[i][0] = map(PotiVar[i], 51, 1023, 60, 255); //Serial.println(Fan[i][0]); } //ManualLock active -> unlock by pressing button if (Fan[i][1]){ temp = digitalRead(SwitchPin[i]); if (temp == HIGH){ Serial.print(i); Serial.println(" ManualLock will be deactivated"); Fan[i][1] = false; Serial.print("Fan[i][1]: "); Serial.println(Fan[i][1]); } } // fan off @ low poti setting if (PotiVar[i] < 50){ Fan[i][0] = 0; } } // look for serial data if (Serial.available()){ Serial.println("Something's there!"); Serial.readBytes(bfr, 2); delay(1000); Serial.print("Serial data: "); Serial.println(bfr[0]); // Serial.flush(); } //Serial.print("before loop bfr[0]: "); //Serial.println(bfr[0]); for (int i = 0; i < 7; i++){ if (i == int(bfr[0])){ Serial.print("i: "); Serial.println(i); Fan[i][0] = int(bfr[1]); //set fan speed variable Fan[i][1] = true; // activate ManualLock variable byte bfr[2] = {7,7}; // clear buffer Serial.print("bfr[0]: "); Serial.println(int(bfr[0])); } } for (int i = 0; i < 7; i++){ analogWrite(FanPin[i], Fan[i][0]); // write fan speed } } Error(s)
When I send a command via my python script, the speed is set correctly and I get the following output:
Something's there! Serial data: 0 i: 0 bfr[0]: 7 i: 0 bfr[0]: 7 ...and again and again and again... Which means, although i "reset" my buffer variable to something that should prevent entering the if-statement, it will somehow fulfill the "if (i == int(bfr[0]))" condition.. but why? If any further information is needed, i'll happily provide that.
