I'm sending data from a python script to my Arduino board. I can succesfully communicate with the board. Based on the data send by the python, the stepper motor connected should either move forward or backward. If python is sending '0' the motor should rotate forward and if python is sending '1' then the motor should rotate backward. When i type '0' in the serial monitor the stepper moves forward and on '1' stepper moves backward. But when python is sending data at first, stepper is not moving forward or backward. Only when the state change happens(if state changes from '1' to '0' or '0' to '1'), the stepper either moves forward or backward. I tried to see if data is send from python, the arduino is receiving data from python. Suggestion will be heavily appreciated.
Ardunio code
static const int SELENOID_PIN = 2;
static const int OPEN = '0';
static const int CLOSE = '1';
static const int STEPS = 30;
static const int delaylegnth = 10;
void setup() {
//establish motor direction toggle pins
pinMode(12, OUTPUT); //CH A -- HIGH = forwards and LOW = backwards???
pinMode(13, OUTPUT); //CH B -- HIGH = forwards and LOW = backwards???
//establish motor brake pins
pinMode(9, OUTPUT); //brake (disable) CH A
pinMode(8, OUTPUT); //brake (disable) CH B
Serial.begin(9600);
while(!Serial){}//wait until the serial port is connected
Serial.write('1');
pinMode(SELENOID_PIN ,OUTPUT);
}
void polarisingA()
{
digitalWrite(9, LOW); //ENABLE CH A
digitalWrite(8, HIGH); //DISABLE CH B
digitalWrite(12, HIGH); //Sets direction of CH A
analogWrite(3, 255); //Moves CH A
delay(delaylegnth);
}
void polarisingB()
{
digitalWrite(9, HIGH); //DISABLE CH A
digitalWrite(8, LOW); //ENABLE CH B
digitalWrite(13, HIGH); //Sets direction of CH B
analogWrite(11, 255); //Moves CH B
delay(delaylegnth);
}
void polarisingC()
{
digitalWrite(9, LOW); //ENABLE CH A
digitalWrite(8, HIGH); //DISABLE CH B
digitalWrite(12, LOW); //Sets direction of CH A
analogWrite(3, 255); //Moves CH A
delay(delaylegnth);
}
void polarisingD()
{
digitalWrite(9, HIGH); //DISABLE CH A
digitalWrite(8, LOW); //ENABLE CH B
digitalWrite(13, LOW); //Sets direction of CH B
analogWrite(11, 255); //Moves CH B
delay(delaylegnth);
}
void stepRight()
{
polarisingA();
polarisingB();
polarisingC();
polarisingD();
}
void stepLeft();
{
polarisingD();
polarisingC();
polarisingB();
polarisingA();
}
void spin(bool dir,int tickes)
{
//Serial.print(dir);
for(int i =0 ; i < tickes; i++)
{
if(dir == true)//right
{
stepRight();
}
else
{
stepLeft();
}
}
}
void loop() {
if(Serial.available() > 0)
{//there is incoming data form the serial and serial is setted up
handleData();
}
delay(5);
}
void handleData()
{
unsigned char a = Serial.read();
Serial.write("new data");
int action = -1;
if(a == OPEN)
{
action = 1;
}
else if(a == CLOSE)
{
//Serial.print("close");
action = 0;
}
if (action != -1)
{
bool dir = action == 1 ? HIGH : LOW ;
spin(dir,STEPS);
digitalWrite(SELENOID_PIN ,action ? HIGH : LOW );
Serial.write(a);//ack
}
}
Python code(Part only sending data to arduino):
def openthedoor(set_accepted_list,set_list_ant_id,set_forbidden_list,set_accepted_list_frozen):
if(((len(set_accepted_list)) >0) & (set_forbidden_list == set()) & ((set_accepted_list_frozen == None) or ((set_accepted_list_frozen & set_accepted_list)== set_accepted_list))):
print"yes,open the gate"
use_step(1)
else:
print"no,close the gate"
use_step(0)
def establishing_connection():
#serial.Serial("COM1",9600)
print ser.read();
last_action = -1
def use_door(activate):
global last_action
#global serial
if(last_action != activate):
send_data(activate)
last_action = activate
def send_data(data):
global ser
try:
if(ser == None):
ser = serial.Serial("COM1",9600,timeout = 0)
print "reconnect"
if(data==0):
ser.write('0')
print "python is telling the arduino to move stepper forward"
else:
ser.write('1')
print "python is telling the ardunio to move stepper backward"
time.sleep(0)
except IOError:
time.sleep(0)
ser.close()
#continue
ser = None
print "after read"
Related
i want to make a program where i can manage appliances using MQTT messages as well as i want to take feedback using normal switches, i tried the following code but in that case switch one and relay on is operating as expected but switch2 & switch 3 are getting called in loop and switch 2 is automatically getting converted from 0 to 1 and hence if condition is getting verified and its getting in loop, please help
#include <WiFi.h>
#include <PubSubClient.h>
#include "ArduinoJson.h"
#define relayOne 15
#define switchOne 32
#define relayTwo 2
#define switchTwo 35
#define relayThree 4
#define switchThree 34
#define relayFour 22
#define switchFour 39
const char* ssid = "*******";//replace this with your wifi access point
const char * password = ""*******";//"; //replace with your wifi password
const char * host = "*.*.*.*"; //IP address of machine on which broker is installed
const int port = 1883;
const char * mqttUser = "user";
const char * mqttPassword = "user";
WiFiClient espClient;
PubSubClient client(espClient);
StaticJsonBuffer < 55 > jsonBuffer;
void callback(char * topic, byte * payload, unsigned int length) {
Serial.print("Message received in topic: ");
Serial.print(topic);
Serial.print(" length is:");
Serial.println(length);
Serial.print("Data Received From Broker:");
String messageTemp;
for (int i = 0; i < length; i++) {
messageTemp += (char) payload[i];
}
//Serial.println(messageTemp);
const size_t capacity = JSON_OBJECT_SIZE(2) + 20;
DynamicJsonBuffer jsonBuffer(capacity);
//const char* json = "{\"pin\":14,\"value\":1}";
const char * json = messageTemp.c_str();
JsonObject & root = jsonBuffer.parseObject(json);
int pin = root["pin"];
int value = root["value"];
Serial.println(pin);
Serial.println(value);
digitalWrite(pin, value);
}
void setup() {
Serial.begin(115200);
pinMode(relayOne, OUTPUT);
pinMode(switchOne, INPUT_PULLUP);
pinMode(relayTwo, OUTPUT);
pinMode(switchTwo, INPUT_PULLUP);
pinMode(relayThree, OUTPUT);
pinMode(switchThree, INPUT_PULLUP);
pinMode(relayFour, OUTPUT);
pinMode(switchFour, INPUT_PULLUP);
WiFi.begin(ssid, password);
Serial.println("Connecting to WiFi..");
while (WiFi.status() != WL_CONNECTED) {
delay(100);
yield();
}
Serial.println("Connected to the WiFi network");
client.setServer(host, port);
client.setCallback(callback);
while (!client.connected()) {
Serial.println("Connecting to MQTT...");
if (client.connect("ESP8266Client", mqttUser, mqttPassword)) {
Serial.println("connected to MQTT broker");
} else {
Serial.print("failed with state ");
Serial.print(client.state());
delay(500);
}
}
Serial.println("ESP32 AS SUBSCRIBER");
client.subscribe("IOT"); //topic name="Sub"
}
void MQTTPOST(int pin, int value)
{
Serial.println("in mqttpost");
//payload formation begins here
String payload ="{";
payload +="\"Pin\":"; payload +=pin; payload +=",";
payload +="\"Value\":"; payload +=value;
payload +="}";
char attributes[1000];
payload.toCharArray( attributes, 1000 );
client.publish("IOT1", attributes); //topic="Pub" MQTT data post command.
Serial.println( attributes );
Serial.println("");
}
int switchOneValue = 0;
int switchTwoValue = 0;
int switchThreeValue = 0;
int switchFourValue = 0;
void loop() {
client.loop();
int valueSwitchOne = digitalRead(switchOne);
Serial.println(valueSwitchOne);
Serial.println(switchOneValue);
if(valueSwitchOne == 0 && switchOneValue == 0){
digitalWrite(relayOne, 1);
switchOneValue = 1;
MQTTPOST(relayOne, 1);
Serial.println("on");
delay(200);
}else if(valueSwitchOne == 1 && switchOneValue == 1) {
digitalWrite(relayOne, 0);
switchOneValue = 0;
MQTTPOST(relayOne, 0);
Serial.println("off");
delay(200);
}
int valueSwitchTwo = digitalRead(switchTwo);
Serial.println(valueSwitchTwo);
Serial.println(switchTwoValue);
delay(1000);
if(valueSwitchTwo == 0 && switchTwoValue == 0){
digitalWrite(relayTwo, 1);
switchTwoValue = 1;
MQTTPOST(relayTwo, 1);
Serial.println("on2");
delay(200);
}else if(valueSwitchTwo == 1 && switchTwoValue == 1) {
digitalWrite(relayTwo, 0);
switchTwoValue = 0;
MQTTPOST(relayTwo, 0);
Serial.println("off2");
delay(200);
}
int valueSwitchThree = digitalRead(switchThree);
if(valueSwitchThree == 0 && switchThreeValue == 0){
digitalWrite(relayThree, 1);
switchThreeValue = 1;
MQTTPOST(relayThree, 1);
Serial.println("on");
delay(200);
}else if(valueSwitchThree == 1 && switchThreeValue == 1) {
digitalWrite(relayThree, 0);
switchThreeValue = 0;
MQTTPOST(relayThree, 0);
Serial.println("off");
delay(200);
}
}
here is a quote from documentation on esp32:
Appendix A – ESP32 Pin Lists
A.1. Notes on ESP32 Pin Lists
Table 24: Notes on ESP32 Pin Lists
GPIO pins 34-39 are input-only. These pins do NOT feature an output
driver or internal pull-up/pull-down circuitry.
digitalRead() can return arbitrary value for those pins because there are no built-in pull-up resistors there - they are effectively dangling in the air.
It means that following code CAN NOT WORK without external pull-up resistors:
#define switchTwo 35
#define switchThree 34
#define switchFour 39
pinMode(switchTwo, INPUT_PULLUP); // THIS DOES NOT WORK for GPIOs: 34-39!!!
pinMode(switchThree, INPUT_PULLUP); // THIS DOES NOT WORK for GPIOs: 34-39 !!!
pinMode(switchFour, INPUT_PULLUP); // THIS DOES NOT WORK for GPIOs: 34-39 !!!
// unpredictable values are here when button is not pressed
int valueSwitchTwo = digitalRead(35);
int valueSwitchThree = digitalRead(34);
Solution:
either use different pins for the switches
or add real hardware resistors into your schematics
I'm new to this!!
python code
i = results[1]
i *= 100
if i >= 75:
print('Recognised as owner!')
arduino.write(str.encode('1'))
else:
print('not matches')
serial monitor
111111111111111111111111111111111111111111111111111111111111111111...
Arduino code
#include <Servo.h>
Servo servo;
char value1;
void setup()
{
servo.attach(8);
servo.write(0);
Serial.begin(9600);
}
void loop()
{
if(Serial.available() > 0)
value1 = Serial.read();
Serial.print(value1);
if (value1 == '1') {
digitalWrite(13, HIGH);
servo.write(90);
delay(100);
}
for (int i = 10; i > 0; i--){
Serial.println("go inside!!, hurry up !!");
delay(1000);
}
servo.write(0);
Serial.println("door is closed");
delay(1000);
}
question:
this program can handle the door system based on face recognition
the Arduino takes the value of "1" over and over. so later servo always looping every 10 s. because the program cant handles 1 single value.
my goal is to make sure that the Arduino only get 1 single input. so later the servo is running well
ty
I'm trying to connect python with Arduino code using serial but I cannot call serial.read() within the led_on_off() function.
This is the Arduino code:
int led=13;
int val=0;
char functionname='K';
#include <string.h>
void setup()
{
Serial.begin(9600);
pinMode(led, OUTPUT);
digitalWrite (led, LOW);
Serial.println("Connection established...");
}
void loop()
{
functionname = Serial.read();
if (functionname= 'L')
{
led_on_off();
}
}//void loop
void led_on_off()
{
val=Serial.read()
if (val= 1)
digitalWrite(led,HIGH)
else if (val == 0)
digitalWrite(led,LOW)
}
And this is the python code:
import serial
Arduino_Serial = serial.Serial('com18',9600) # Create Serial port object called arduinoSerialData
print(Arduino_Serial.readline()) # read the serial data and print it as line
print("Enter L to ON LED and M dc motor")
input_data = input()
Arduino_Serial.write(input_data.encode())
print(Arduino_Serial.readline())
input_value=input("enter 1 or 0")
Arduino_Serial.write(input_value.encode())
my expectation is to get input (1 or 0) from python code and process it within the led_on_off function in Arduino code using the serial.read() function and turn on or off the led at pin 13.
As already stated by #KIIV your Arduino code has some syntax errors. Besides that, you are sending a string from your Python script (input function) so you need to read it as a string on Arduino. Something like this would do the job:
Python script:
import serial
# Create Serial port object called arduinoSerialData
Arduino_Serial = serial.Serial('com18', 9600)
# read the serial data and print it as line
print(Arduino_Serial.readline())
input_data = input("Enter L to ON LED and M dc motor: ")
Arduino_Serial.write(input_data.encode())
print("Received Command:", Arduino_Serial.readline())
while True:
input_value = input("enter 1 or 0")
Arduino_Serial.write(input_value.encode())
Arduino code:
int led = 13;
void setup()
{
Serial.begin(9600);
pinMode(led, OUTPUT);
digitalWrite(led, LOW);
}
void loop()
{
//void loop
if (Serial.available())
{
String functionname = Serial.readString();
if (functionname == "L")
{
Serial.println("Command received from Arduino!");
while (1)
{
led_on_off();
}
}
}
}
void led_on_off()
{
if (Serial.available())
{
String val = Serial.readString();
if (val == "1")
digitalWrite(led, HIGH);
else if (val == "0")
digitalWrite(led, LOW);
}
}
May I please know why there is no output on screen for this source code.Also please tell me why and how I can Fix it.
The project is based on this Source Code. AutoRCCar on GitHub
I have flashed my Arduino Uno with this code
// assign pin num
int right_pin = 6;
int left_pin = 7;
int forward_pin = 10;
int reverse_pin = 9;
// duration for output
int time = 50;
// initial command
int command = 0;
void setup() {
pinMode(right_pin, OUTPUT);
pinMode(left_pin, OUTPUT);
pinMode(forward_pin, OUTPUT);
pinMode(reverse_pin, OUTPUT);
Serial.begin(115200);
}
void loop() {
//receive command
if (Serial.available() > 0){
command = Serial.read();
}
else{
reset();
}
send_command(command,time);
}
void right(int time){
digitalWrite(right_pin, LOW);
delay(time);
}
void left(int time){
digitalWrite(left_pin, LOW);
delay(time);
}
void forward(int time){
digitalWrite(forward_pin, LOW);
delay(time);
}
void reverse(int time){
digitalWrite(reverse_pin, LOW);
delay(time);
}
void forward_right(int time){
digitalWrite(forward_pin, LOW);
digitalWrite(right_pin, LOW);
delay(time);
}
void reverse_right(int time){
digitalWrite(reverse_pin, LOW);
digitalWrite(right_pin, LOW);
delay(time);
}
void forward_left(int time){
digitalWrite(forward_pin, LOW);
digitalWrite(left_pin, LOW);
delay(time);
}
void reverse_left(int time){
digitalWrite(reverse_pin, LOW);
digitalWrite(left_pin, LOW);
delay(time);
}
void reset(){
digitalWrite(right_pin, HIGH);
digitalWrite(left_pin, HIGH);
digitalWrite(forward_pin, HIGH);
digitalWrite(reverse_pin, HIGH);
}
void send_command(int command, int time){
switch (command){
//reset command
case 0: reset(); break;
// single command
case 1: forward(time); break;
case 2: reverse(time); break;
case 3: right(time); break;
case 4: left(time); break;
//combination command
case 6: forward_right(time); break;
case 7: forward_left(time); break;
case 8: reverse_right(time); break;
case 9: reverse_left(time); break;
default: Serial.print("Invalid Command\n");
}
}
Then I have run the rc_control_test.py
The Code
__author__ = 'zhengwang'
import serial
import pygame
from pygame.locals import *
class RCTest(object):
def __init__(self):
pygame.init()
self.ser = serial.Serial('COM3', 115200, timeout=1)
self.send_inst = True
self.steer()
def steer(self):
while self.send_inst:
for event in pygame.event.get():
if event.type == KEYDOWN:
key_input = pygame.key.get_pressed()
# complex orders
if key_input[pygame.K_UP] and key_input[pygame.K_RIGHT]:
print("Forward Right")
self.ser.write(chr(6))
elif key_input[pygame.K_UP] and key_input[pygame.K_LEFT]:
print("Forward Left")
self.ser.write(chr(7))
elif key_input[pygame.K_DOWN] and key_input[pygame.K_RIGHT]:
print("Reverse Right")
self.ser.write(chr(8))
elif key_input[pygame.K_DOWN] and key_input[pygame.K_LEFT]:
print("Reverse Left")
self.ser.write(chr(9))
# simple orders
elif key_input[pygame.K_UP]:
print("Forward")
self.ser.write(chr(1))
elif key_input[pygame.K_DOWN]:
print("Reverse")
self.ser.write(chr(2))
elif key_input[pygame.K_RIGHT]:
print("Right")
self.ser.write(chr(3))
elif key_input[pygame.K_LEFT]:
print("Left")
self.ser.write(chr(4))
# exit
elif key_input[pygame.K_x] or key_input[pygame.K_q]:
print 'Exit'
self.send_inst = False
self.ser.write(chr(0))
self.ser.close()
break
elif event.type == pygame.KEYUP:
self.ser.write(chr(0))
if __name__ == '__main__':
RCTest()
But Only have this in Display in the Console
RESTART: C:\Users\Raptor_Is_Online\Desktop\AutoRCCar\test\rc_control_test.py
If possible please help me. Any and all questions are welcome.
I am very new to Python as I'm currently learning C++ but this Project is in Python. How Do I FIX This??
use "pygame.display.set_mode()" it will initialize the window click arrow keys on that windows you will get output
Intent: Control arduino uno from serial port
Tools:
https://github.com/JanStevens/ArduinoPi-Python
I got the server working on both my mac and my Model b+ Raspberry.
The browser behaves as shown in the picture below in both situations.
To me it looks like the server sent the message to Arduino successfully. But the data somehow gets lost on the way. The Arduino board resets every time I access the url in my browser. I googled and found that a 10uF capacitor between ground and reset pins would prevent the reset from happening. It did, but pin 3 won't go "HIGH". I got a LED+RESISTOR plugged on pin 3 and ground accordingly. I can see the Rx led blinking every time I access the url. So it makes me think that the Arduino is misunderstanding the command from my Flask sever.
OG Arduino code:
String cmd;
bool cmdRec = false;
void setup()
{
//Start the connection with the Raspberry Pi
Serial1.begin(115200);
// Start the connection with the Laptop, for debugging only!
//Serial.begin(115200);
}
void loop()
{
handleCmd();
}
void serialEvent1() {
while(Serial1.available() > 0) {
char inByte = (char)Serial1.read();
if(inByte == ':') {
cmdRec = true;
return;
} else if(inByte == '#') {
cmd = "";
cmdRec = false;
return;
} else {
cmd += inByte;
return;
}
}
}
void handleCmd() {
if(!cmdRec) return;
// If you have problems try changing this value,
// my MEGA2560 has a lot of space
int data[80];
int numArgs = 0;
int beginIdx = 0;
int idx = cmd.indexOf(",");
String arg;
char charBuffer[20];
while (idx != -1) {
arg = cmd.substring(beginIdx, idx);
arg.toCharArray(charBuffer, 16);
data[numArgs++] = atoi(charBuffer);
beginIdx = idx + 1;
idx = cmd.indexOf(",", beginIdx);
}
// And also fetch the last command
arg = cmd.substring(beginIdx);
arg.toCharArray(charBuffer, 16);
data[numArgs++] = atoi(charBuffer);
// Now execute the command
execCmd(data);
cmdRec = false;
}
// For advanced function like switch all the leds in RGB
void execCmd(int* data) {
switch(data[0]) {
case 101:
{
for(int i = 2; i < (data[1]*2)+1; i+=2) {
pinMode(data[i], OUTPUT);
analogWrite(data[i], data[i+1]);
}
}
break;
case 102:
{
pinMode(data[1], INPUT);
int sensor = analogRead(data[1]);
Serial1.println(sensor);
}
break;
case 103:
{
String result = "";
int sensor = 0;
for(int j = 2; j < data[1]+2; j++) {
pinMode(data[j], INPUT);
sensor = analogRead(data[j]);
result += String(sensor)+",";
}
Serial1.println(result);
}
break;
default:
{
pinMode(data[0], OUTPUT);
analogWrite(data[0], data[1]);
}
break;
}
}
It does not compile this way. So I uncommented the second Serial.begin line and deleted all the "Serial1." appearances on the code. I can't see no action on the arduino IDE serial when I test it on my mac.
As the code was written with an Arduino Mega that got 2 or 3 serial ports, void serialevent1() is triggered when there is communication going on the the MEGA's SERIAL1 port. Since I am working on the UNO, that only have 1 serial port, all i had to do was delete the "1" before the parenthesis and all worked as supposed.
void serialEvent() { }