I bought a sound sensor ( 3 pins VCC GND OUT).
I connected all the pins correctly (I think)
VCC to 5V
GND to GND
OUT to A0
But when I upload the code into the arduino uno then the internal green light of sound sensor is blinking with the sound like music. But any LED at breadboard doesn't.
the value of the function sensorValue = analogRead(A0); return almost same value while making noise. After calibrating the sensor the value is also almost same.
Here my Code
#define out A0
int th = 320;
int sensorValue = 0;
int pins[3] = {10,11,12};
void setup(){
int i;
for( i = 0; i<3; i++ ){
pinMode(pins[i], OUTPUT);
}
//pinMode(out,INPUT);
Serial.begin(9600);
}
void loop(){
// sensorValue = analogRead(OUT);
sensorValue = analogRead(out);
int chk = digitalRead(out);
Serial.print("sensorValue: ");
Serial.println(sensorValue);
Serial.print("digitalRead: ");
Serial.println(chk);
int i=0;
if( sensorValue > th){
for( i = 0; i<3; i++){
digitalWrite(pins[i],HIGH);
}
}else{
for( i = 0; i<3; i++){
digitalWrite(pins[i],LOW);
}
}
}
What's wrong with it?
Related
I'm an undergraduate student. We have an assignment to use Energia and the MSP432-P401R microcontroller to create an OR gate and AND gate IC tester.
You place the IC in the tester circuit and the tester will first determine if the IC is an AND or OR IC. Then, it will indicate which gates on the chip are functioning properly.
My issue is regrading the logical HIGH output voltage of the MSP432. My input signals, a and b, are passed to the IC gates. When my "a" signal is logical HIGH, its voltage is 2.8V. When my "b" signal is logical HIGH, its voltage is 0.7V. This 0.7V is too low for my ICs to register as a HIGH input. I am reading the voltage directly from the MSP432 pin.
I have tried using different GPIO pins and resetting the board. However, the "b" signal is still 0.7V.
My code for setting up "a" and "b" are similar, so I'm not sure why they are outputting different voltages.
My code:
//IC TEST
//Gate inputs pin assignment
int APin=11;
int BPin=8; //other pins tried: 12, 18, 5
//Gate output read pins
int output1Pin=38;
int output2Pin=37;
int output3Pin=36;
int output4Pin=35;
//LED pins
int gate1LEDPin=31;
int gate2LEDPin=32;
int gate3LEDPin=33;
int gate4LEDPin=34; //Gate functioning indicators
int orLEDPin = 40;
int andLEDPin= 39; //Logic of IC indicators
//Truth Table Arrays with inputs a and b
int aValue[]={0, 0, 1, 1};
int bValue[]={0, 1, 0, 1};
int orTrue[]={0, 1, 1, 1};
int andTrue[]={0, 0, 0, 1};
//Function Declaration
int workTest(int,int); //checks if gate is working
//by comparing gate output to
//expected truth result
int logicTest(); //Returns 0 for OR IC, 1 for AND IC
//Progrram variables
int i; //for loop counter
int gate1Result;
int gate2Result;
int gate3Result;
int gate4Result; //Stores number of times gate outputs
//correct value for each ab input
int logicRead; //0 is OR gate. 1 is AND gate
//--------------SETUP-----------------
void setup()
{
Serial.begin(9600);
pinMode(APin, OUTPUT);
pinMode(BPin, OUTPUT);
pinMode(output1Pin, INPUT);
pinMode(output2Pin, INPUT);
pinMode(output3Pin, INPUT);
pinMode(output4Pin, INPUT); //gate output reads
pinMode(orLEDPin, OUTPUT);
pinMode(andLEDPin, OUTPUT);
pinMode(gate1LEDPin, OUTPUT);
pinMode(gate2LEDPin, OUTPUT);
pinMode(gate3LEDPin, OUTPUT);
pinMode(gate4LEDPin, OUTPUT);
}
//END SETUP
//-----------------LOOP---------------------
void loop()
{
gate1Result = 0;
gate2Result = 0;
gate3Result = 0;
gate4Result = 0;
//test IC for its logic function
logicRead = logicTest(); //logicTest returns 0 for OR, 1 for AND
if(logicRead == 9) //logic of IC cannot be determined
{
Serial.println("Try again");
}
if(logicRead != 9)
{
for(i=0; i<4; i++)
{
digitalWrite(APin, aValue[i]); //Load ith value of aValue array
digitalWrite(BPin, bValue[i]); //Load ith value of bValue array
Serial.print("AB = ");
Serial.print(aValue[i]);
Serial.println(bValue[i]);
delay(4000); //Stabilize input signals
if(logicRead == 0) //OR Testing
{
Serial.print("OR Output should be ");
Serial.println(orTrue[i]);
Serial.print("Gate 1: ");
gate1Result = gate1Result + workTest(orTrue[i], output1Pin);
Serial.print("Gate 2: ");
gate2Result = gate2Result + workTest(orTrue[i], output2Pin);
Serial.print("Gate 3: ");
gate3Result = gate3Result + workTest(orTrue[i], output3Pin);
Serial.print("Gate 4: ");
gate4Result = gate4Result + workTest(orTrue[i], output4Pin);
}
if(logicRead == 1) //AND Testing
{
Serial.print("AND Output should be ");
Serial.println(andTrue[i]);
Serial.print("Gate 1: ");
gate1Result = gate1Result + workTest(andTrue[i], output1Pin);
Serial.print("Gate 2: ");
gate2Result = gate2Result + workTest(andTrue[i], output2Pin);
Serial.print("Gate 3: ");
gate3Result = gate3Result + workTest(andTrue[i], output3Pin);
Serial.print("Gate 4: ");
gate4Result = gate4Result + workTest(andTrue[i], output4Pin);
}
}
//Write gate 1 LED
if(gate1Result == 4)
{
digitalWrite(gate1LEDPin, HIGH);
Serial.println("Gate 1 works");
}
else
{
digitalWrite(gate1LEDPin, LOW);
Serial.println("Gate 1 FAIL");
}
//Write gate 2 LED
if(gate2Result == 4)
{
digitalWrite(gate2LEDPin, HIGH);
Serial.println("Gate 2 works");
}
else
{
digitalWrite(gate2LEDPin, LOW);
Serial.println("Gate 2 FAIL");
}
//Write gate 3 LED
if(gate3Result == 4)
{
digitalWrite(gate3LEDPin, HIGH);
Serial.println("Gate 3 works");
}
else
{
digitalWrite(gate3LEDPin, LOW);
Serial.println("Gate 3 FAIL");
}
//Write gate 4 LED
if(gate4Result == 4)
{
digitalWrite(gate4LEDPin, HIGH);
Serial.println("Gate 4 works");
}
else
{
digitalWrite(gate4LEDPin, LOW);
Serial.println("Gate 4 FAIL");
}
}
Serial.println();
Serial.println();
delay(10000); //Wait 10 sec before running code again
}//End void loop
//-----------Function Definitions-----------------------
//This function tests if all gates of the IC are working
//Returns 1 if gate is functioning
//Returns 0 if gate is not functioning
int workTest(int truth, int gateNum)
{
int gateRead = 0; //Updates for each gate output
int result = 0; //TotResult is 1 for all gates pass, 0 for any gate fail
gateRead= digitalRead(gateNum);
if(gateRead == truth)
{
result = 1;
}
else
{
result = 0;
}
Serial.println(gateRead);
return result; //1 for pass, 0 for gate fails
}
//This function tests the logic of the IC
//Returns 1 if IC is an AND gate
//Returns 0 if IC is an OR gate
//Allows for 1 broken gate
//If more than 1 gate broken, logic cannot
//be determined
int logicTest()
{
int aVal[]={0, 1};
int bVal[]={1, 0};
int outputCount = 0;
int logicGate = 0;
int c;
int gate1;
int gate2;
int gate3;
int gate4;
for(c=0; c<2; c++) //only testing ab = 01 and ab = 10
{
digitalWrite(APin, aVal[c]);
digitalWrite(BPin, bVal[c]);
delay(1000); //Stabilize input delay
gate1=digitalRead(output1Pin);
gate2=digitalRead(output2Pin);
gate3=digitalRead(output3Pin);
gate4=digitalRead(output4Pin);
outputCount = outputCount + gate1 + gate2 + gate3 + gate4;
}
if(outputCount < 3) //IC is likely AND gate w/ 1 broken gate
{
logicGate = 1;
Serial.println("IC is an AND gate");
digitalWrite(andLEDPin, HIGH);
digitalWrite(orLEDPin, LOW);
}
else if(outputCount > 5 && outputCount < 9) //IC is likely OR gate w/ 1 broken gate
{
logicGate = 0;
Serial.println("IC is an OR gate");
digitalWrite(andLEDPin, LOW);
digitalWrite(orLEDPin, HIGH);
}
else
{
logicGate = 9;
digitalWrite(andLEDPin, LOW);
digitalWrite(orLEDPin, LOW);
Serial.println("Logic of IC could not be determined");
Serial.println("IC could be broken. Make sure IC is connected properly.");
Serial.println();
}
return logicGate;
}
Here is the circuit setup:
I have this pretty simple task to light up an LED for 3 seconds when I send the right password from my Android phone to the Arduino via Bluetooth. Below's the code I am using:
Setting up variables:
int output = 9; //Pin 9 on arduino (LED)
char final[4];
char correct[4] = {'Q','W','E','R'}; //Password is QWER
int pass_true;
void setup() {
pinMode(output, OUTPUT);
Serial.begin(9600);
}
Here's the code in question:
void loop() {
while(Serial.available()){
for(int i=0; i<4; i++){
final[i] = Serial.read();
}
for(int i=0; i<4; i++){
if(final[i]==correct[i]){
pass_true = 1;
}
else{
pass_true = 0;
break;
}
}
}
if(pass_true==1){
digitalWrite(output, HIGH);
Serial.println("ON");
delay(3000);
pass_true = 0;
}
else{
digitalWrite(output, LOW);
}
}
As a newbie I can't see what's wrong with this code. I don't get any response from the arduino when sending the correct password. The LED doesn't turn on, the device doesn't return any Serial.println() string.
I see to it that the electrical part is all good so I'm pretty sure the problem is with the code. I am using Bluetooth spp pro Android app.
I tried to ask this question on the Raspberry Pi forums, but I have received no responses at all. I thought I might query the minds of the StackOverflow community that has been so helpful in the past.
I'm writing a userspace driver for the Raspberry Pi (specifically, may be ported to other platforms later) which makes use of the bcm2835 library (GPIO) and uinput (Linux user-input virtual devices). I need to read GPIO pins and translate their values into simulated keypresses on a virtual keyboard. The GPIO part has been completed, and the translation part is also completed. Unfortunately, the virtual-keyboard part has not been solved. Uinput refuses to cooperate.
Now, the exact same code works perfectly on a Debian desktop machine. The evdev and uinput modules are required, both of which were loaded in all test cases. On the desktop, inputs can be triggered, however, on the Raspberry Pi, I can verify that the GPIO subsystem has registered the input, but the uinput events do not trigger. Does anyone have a lead on what I might do?
Thank you very much, if you need any information, logs, or otherwise, please let me know and I will post them as soon as I can.
This is a complete solution that works for me. I have a custom-made keypad and these are the keys I have defined. Here is the link to original pdf I used.
Of course you can define whatever key you want, just add it to the array.
Note: this code only works with elevated permission.
int allowed_keys[allowed_KEYS_size][2] = {0};
void main()
{
init_keys();
int fd = open_uinput();
int key_evt = getKeyEVT(49); // ASCII code for 1
// simulate key press and key release
emit(fd, EV_KEY, key_evt, 1);
emit(fd, EV_SYN, SYN_REPORT, 0);
emit(fd, EV_KEY, key_evt, 0);
emit(fd, EV_SYN, SYN_REPORT, 0);
}
long int emit(int fd, int type, int code, int val)
{
struct input_event ie;
ie.type = type;
ie.code = code;
ie.value = val;
/* timestamp values below are ignored */
ie.time.tv_sec = 0;
ie.time.tv_usec = 0;
long int y = write(fd, &ie, sizeof(ie));
return y;
}
int open_uinput()
{
int fdui = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
if (fdui < 0)
{
printf("uinput fd creation failed!\n");
exit(EXIT_FAILURE);
}
ioctl(fdui, UI_SET_EVBIT, EV_KEY);
ioctl(fdui, UI_SET_EVBIT, EV_SYN); //added by behzad
for (int i = 0; i < allowed_KEYS_size; i++)
ioctl(fdui, UI_SET_KEYBIT, allowed_keys[i][1]);
struct uinput_setup usetup;
memset(&usetup, 0, sizeof(usetup));
usetup.id.bustype = BUS_USB;
usetup.id.vendor = 0x1234; /* sample vendor */
usetup.id.product = 0x5678; /* sample product */
strcpy(usetup.name, "My Keypad. Ver 1.1");
ioctl(fdui, UI_DEV_SETUP, &usetup);
ioctl(fdui, UI_DEV_CREATE);
sleep(2);
return fdui;
}
int getKeyEVT(int k)
{
for (int i = 0; i < allowed_KEYS_size; i++)
{
if (allowed_keys[i][0] == k)
return allowed_keys[i][1];
}
return -1;
}
void init_keys()
{
// Reference:
// https://www.alt-codes.net/arrow_alt_codes.php
// /usr/include/linux/input-event-codes.h
allowed_keys[0][0] = 48; //ASCII ---> 0
allowed_keys[0][1] = KEY_0; //LINUX
allowed_keys[1][0] = 49; //ASCII
allowed_keys[1][1] = KEY_1; //LINUX
allowed_keys[2][0] = 50; //ASCII
allowed_keys[2][1] = KEY_2; //LINUX
allowed_keys[3][0] = 51; //ASCII
allowed_keys[3][1] = KEY_3; //LINUX
}
My Code:
#include <SoftwareSerial.h>
SoftwareSerial bluetooth(2,3);
// Output
int redPin = 6; // Red LED,
int grnPin = 11; // Green LED,
int bluPin = 5; // Blue LED,
// Color arrays
int black[3] = { 0, 0, 0 };
int white[3] = { 100, 100, 100 };
int red[3] = { 100, 0, 0 };
int green[3] = { 0, 100, 0 };
int blue[3] = { 0, 0, 100 };
int yellow[3] = { 40, 95, 0 };
int dimWhite[3] = { 30, 30, 30 };
// etc.
// Set initial color
int redVal = black[0];
int grnVal = black[1];
int bluVal = black[2];
int wait = 10; // 10ms internal crossFade delay; increase for slower fades
int hold = 0; // Optional hold when a color is complete, before the next crossFade
int r = 0;
int g = 0;
int b = 0;
char mode = '\0';
// Initialize color variables
int prevR = redVal;
int prevG = grnVal;
int prevB = bluVal;
// Set up the LED outputs
void setup()
{
pinMode(redPin, OUTPUT); // sets the pins as output
pinMode(grnPin, OUTPUT);
pinMode(bluPin, OUTPUT);
Serial.begin(9600);
delay(1000);
bluetooth.begin(115200);
delay(100);
bluetooth.print("$$$");
delay(100);
bluetooth.println("U,9600,N");
bluetooth.begin(9600);
delay(100);
analogWrite(redPin, 0);
analogWrite(grnPin, 0);
analogWrite(bluPin, 0);
Serial.println("Bluetooth initiated.");
}
void printHEX() {
Serial.print(r, HEX);
Serial.print(g, HEX);
Serial.println(b, HEX);
bluetooth.print(r, HEX);
bluetooth.print(g, HEX);
bluetooth.println(b, HEX);
}
// Main program: list the order of crossfades
void loop()
{
//Read from bluetooth and write to usb serial
while(bluetooth.available())
{
if(mode == '\0') {
mode = (char)bluetooth.read();
}
if(mode == 'c'){
int r1 = bluetooth.parseInt();
int g1 = bluetooth.parseInt();
int b1 = bluetooth.parseInt();
if (bluetooth.read() == '\n') {
if(r1 != r || g1 != g || b1 != b) {
r = r1;
g = g1;
b = b1;
analogWrite(redPin, r);
analogWrite(grnPin, g);
analogWrite(bluPin, b);
printHEX();
mode = '\0';
} else {
printHEX();
mode = '\0';
}
}
} else if(mode == 'p') {
if (bluetooth.read() == '\n') {
printHEX();
mode = '\0';
}
}
}
//Read from usb serial to bluetooth
if(Serial.available())
{
char toSend = (char)Serial.read();
bluetooth.print(toSend);
}
}
If I run this code, everything works great. That is until I plug it into the power source and nothing else.
If I plug it into the power source, the program doesn't start (no bluetooth response). If I plug it into usb and power or usb only, the program works. If I unplug usb after plugging usb and power source the program still works! I have tried debugging as much as I can, but I don't know where the error is. The power supply is rated at 12V 2 Amps to light up the LED strips.
Update: I found out that if I press the reset button after power on everything starts to work. Is there a way to automatically reset arduino on startup???
I think you are using arduino leonardo.
Try this at very beginning of setup:
while(!Serial){}
while(!bluetooth){}
The arduino leonardo prepare the serial port after some while and may cause some problems.
My project is to allow automatic lightening by detecting motion using PIR Sensors.
THis is what I want to do :
when the first motion sensor "inputpin" is HIGH which means a motion1 is detected , ledPin1 is set to HIGH.... then I check the signal from the other PIR sensor "inputpin2" if it is HIGH ledPin3 should be HIGH , If it is LOW ledpin2 should be HIGH.
I wrote this code , but what it actually do is after a motion is detected from the first sensor"inputPin" , ledPin3 is set to high as if the second sensor is always HIGH !
Can any one help me with this problem.
Thanks
` ``
int ledPin1 = 13; // choose the pin for the LED
int ledPin2 = 12;
int ledPin3 = 11;
int inputPin = 2; // choose the input pin (for PIR sensor)
int inputPin2 = 1;
int pirState1 = LOW; // we start, assuming no motion detected
int pirState2 = LOW;
int val = 0; // variable for reading the pin status
int val2 = 0;
int pinSpeaker = 10; //Set up a speaker on a PWM pin (digital 9, 10, or 11)
void setup() {
pinMode(ledPin1, OUTPUT); // declare LED as output
pinMode(ledPin2, OUTPUT); // declare LED as output
pinMode(ledPin3, OUTPUT);
pinMode(inputPin, INPUT); // declare sensor 1 as input
pinMode(inputPin2, INPUT); // declare sensor 2 as input
// pinMode(pinSpeaker, OUTPUT);
Serial.begin(9600);
}
void loop(){
val = digitalRead(inputPin); // read input value
if (val == HIGH) { // check if the input is HIGH
digitalWrite(ledPin1, HIGH); // turn LED ON
delay (1500);
if (pirState1 == LOW) {
// we have just turned on
Serial.println("Motion1 detected!");
// We only want to print on the output change, not state
pirState1 = HIGH;
}
delay (1500);
// check sensor 2 after delay
val2 = digitalRead(inputPin2);
if (val2 == HIGH){
digitalWrite(ledPin2, LOW);
delay(1500);
digitalWrite(ledPin3,HIGH);
//playTone(300, 160);
delay(1500);
if (pirState2 == LOW) {
// we have just turned on
Serial.println("Motion1 from sensor 2 detected!");
// We only want to print on the output change, not state
pirState2 = HIGH;
}
}
if(val2 == LOW){
digitalWrite(ledPin2, HIGH);
//playTone(300, 160);
delay(1500);
digitalWrite(ledPin3,LOW);
delay(1500);
}
} else {
digitalWrite(ledPin1, LOW); // turn LED OFF
delay (1500);
digitalWrite(ledPin2, LOW); // may be already
//playTone(0, 0);
delay(1500);
digitalWrite(ledPin3, LOW); // turn LED OFF
delay (1500);
if (pirState1 == HIGH){
// we have just turned of
Serial.println("Motion ended!");
// We only want to print on the output change, not state
pirState1 = LOW;
}
if (pirState2 == HIGH){
// we have just turned of
Serial.println("Motion ended!");
// We only want to print on the output change, not state
pirState2 = LOW;
}
}
}
// duration in mSecs, frequency in hertz
void playTone(long duration, int freq) {
duration *= 1000;
int period = (1.0 / freq) * 1000000;
long elapsed_time = 0;
while (elapsed_time < duration) {
digitalWrite(pinSpeaker,HIGH);
delayMicroseconds(period / 2);
digitalWrite(pinSpeaker, LOW);
delayMicroseconds(period / 2);
elapsed_time += (period);
}
}
`
Change inputPin2 from 1 to 3 for example. Just don't use the pins 0 or 1 (those assigned for Tx and Rx), hope this works.