I'm new to communication
I was trying to codes for communication
Here is my aurdino codes:
Serial.begin(9600);
}
void loop(){
if(Serial.available()>0){
data = Serial.readStringUntil('\n');
Serial.write("Pi's data\n");
Serial.println(data);
}
}
And my raspberry pi codes
import serial
import time
a=0
ser = serial.Serial('/dev/ttyUSB0',9600,timeout=1)
ser.reset_input_buffer()
while True:
ser.write(b"a")
line = ser.readline().decode('utf-8').rstrip()
print(line)
Why my data gets triple sometimes forth
my expected return is
Pi's data
a
Pi's data
a
Pi's data
a
Pi's data
a
But result is
Pi's data
aaa
Pi's data
aaa
Pi's data
aaaa
Pi's data
aaa
Related
I've been working with a LilyGo-TCall-SIM800 module for several days, trying to get out of a dead end.
I have tried an example from "random nerd tutorials" which works correctly. The module connects to the internet and can send data to the cloud.
I have the problem to send AT commands to the SIM800L chip integrated in the module. I can't get the chip to react back.
I have tried using Serial1 and Serial2. I have also tried configuring the RX and TX transmission pins, and I have tried with different baudrates. Always with negative results... when sending the "AT\r" command to the SIM800L, it should return "OK". But it never does.
I have simplified the code as much as possible to minimize errors:
/*
Name: TestAT.ino
Created: 08/12/2022 23:15:28
Author: user
*/
// Set serial for debug console (to the Serial Monitor, speed 115200)
#define SerialMon Serial
// Comunications between ESP32 and SIM800L
#define SerialAT Serial1
//Comunications between ESP32 ans SIM800L go thought TX and RX pins on Serial1 Port
#define MODEM_RX1 16
#define MODEM_TX1 17
void setup() {
// Set console baud rate
SerialMon.begin(115200);
delay(1000);
//Set SerialAT baud rate
SerialAT.begin(38400, SERIAL_8N1, MODEM_RX1, MODEM_TX1);
//Set timeLimit for SerialAT reads
SerialAT.setTimeout(2000);
}
void loop() {
String returned = "";
char ATcommand[] = { 'A','T','\r' };
SerialAT.print(ATcommand);
delay(1000);
returned = SerialAT.readString();
SerialMon.print(millis());
SerialMon.print(" - ");
SerialMon.print(ATcommand);
SerialMon.print(" - SerialAT returned:");
SerialMon.println(returned);
}
Anybody can help me out on this? Any idea or sugestion?
Thanks in advance
I'm new at python and i'm setting up my school project that it's going to detect the zero cross for trigger a PWM pulse so i'm using Arduino and Raspberry Pi 3.
I'm trying to read from serial port of the Arduino for read it in the Raspberry Pi, after that what i need is build an if conditional with that data that i recieved.
Arduino sends from serial port ON and OFF message with this code
const int inputPin = 2;
int value = 0;
void setup() {
Serial.begin(9600);
pinMode(inputPin, INPUT_PULLUP);
}
void loop(){
value = digitalRead(inputPin); //digital read of pin
//sends a message to serial port depending of the value read
if (value == HIGH) {
Serial.println("ON");
}
else {
Serial.println("OFF");
}
delayMicroseconds(1000);
}
On Arduino serial read it shows continuously
OFF
ON
ON
ON
OFF
So on python i want to read those two values "ON" and "OFF" or at least one that when it takes a OFF value for example at the next 1 ms it turn on PWM pulse.
Something like:
if zerocross == OFF:
pi.hardware_PWM(heat,200,dutycycle)
This is my python code for read the data from serial port:
import time
try:
import serial
arduino = serial.Serial('/dev/ttyACM0', baudrate=9600, timeout=1.0)
arduino.setDTR(False)
time.sleep(1)
arduino.flushInput()
arduino.setDTR(True)
except (ImportError, serial.SerialException):
import io
class FakeArduino(io.RawIOBase):
def readline(self):
time.sleep(0.1)
return b'sensor = 0\toutput = 0\r\n'
arduino = FakeArduino()
with arduino:
while True:
try:
line = arduino.readline()
zerocross = line.decode('ascii', errors='replace')#, end=''
if zerocross == OFF:
print ('ok')
except KeyboardInterrupt:
print("Exiting")
break
this is the out in the python shell
Traceback (most recent call last):
File "/home/pi/Desktop/arduino python raspb.py", line 33, in <module>
if zerocross == OFF:
NameError: name 'OFF' is not defined
I've already tried to convert the serial data into a string but i get "built-in method decode" when i try to print the value. Please if someone can show me some other methods i would appreciate it so much.
I'm trying to program my MCU in mickroc still I do not get a output.
Is there any difference between PIC18f65k40 and PIC18f65k22 in terms of initiating uart transmission? Whether there is any need to initiate or disable any special registers in PIC18f65k40?
In mikroc software there present a library for uart so I just copied the program from mickroe website and add my transmitter and receiver pins(RX4PPS = 0x11; and TX4PPS = 0x10;)in program by configuring portc as output but my circuit does not work.
char i ;
void main()
{
TRISC = 0b00000000;// making port as output
RX4PPS = 0x11;
TX4PPS = 0x10;
UART4_Init(9600); // Initialize USART module
// (8 bit, 9600 baud rate, no parity bit...)
delay_ms(500);
UART4_Write_Text("Hello world!");
UART4_Write(13); // Start a new line
UART4_Write(10);
UART4_Write_Text("PIC18F65K40 UART example");
UART4_Write(13); // Start a new line
UART4_Write(10);
while (1) {
if (UART4_Data_Ready()) { // If data has been received
i = UART4_Read(); // read it
UART4_Write(i); // and send it back
}
}
}
The PIC18F65k22 has only 2 UARTs and you are working with UART4. I guess the library don't support the controller. Better write the code on your own. There are some examples in the datasheet.
I am trying to read data from both the sensor and the gps (one by one is ok). The sensors work well individually but the Ultrasonic sensor does not give any output. I am new to arduino so i just mixed the codes from the two examples using NewPing Library and TinyGPS libraries. Here is the code. Please suggest what additions need to be made to the code to make both devices work together.
/*********************
*10 to GPS Module TX*
*09 to GPS Module RX*
*********************/
// 1.TESTED USING LED
// 2. added ultrasound libraries
#include <NewPing.h>
#define TRIGGER_PIN 5 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN 4 // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 400 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.
#include <SoftwareSerial.h>
#include <TinyGPS.h>
SoftwareSerial mySerial(10, 11);
TinyGPS gps;
float gpsdump(TinyGPS &gps);
void setup()
{
// Oploen serial communications and wait for port to open:
Serial.begin(9600);
// set the data rate for the SoftwareSerial port
mySerial.begin(9600);
delay(1000);
}
void loop() // run over and over
{
bool newdata = false;
unsigned long start = millis();
// Every 5 seconds we print an update
while (millis() - start < 5000)
{
if (mySerial.available())
{
char c = mySerial.read();
//Serial.print(c); // uncomment to see raw GPS data
if (gps.encode(c))
{
newdata = true;
break; // uncomment to print new data immediately!
}
}
}
if (newdata)
{
Serial.println("Acquired Data");
Serial.println("-------------");
gpsdump(gps);
Serial.println("-------------");
Serial.println();
}
}
float gpsdump(TinyGPS &gps)
{
// On Arduino, GPS characters may be lost during lengthy Serial.print()
// On Teensy, Serial prints to USB, which has large output buffering and
// runs very fast, so it's not necessary to worry about missing 4800
// baud GPS characters.
Serial.println("speed");
Serial.println(gps.f_speed_kmph()) ;
Serial.print(sonar.ping_cm());
;
}
The main problems:
You cannot wait 5 seconds without processing the characters. The Arduino receive buffer only has room for 64 characters. The GPS device could have sent 5000 characters during that time, so most of them will get dropped. This prevents the GPS library from ever parsing a complete sentence.
A ping will interfere with software serial ports. You will have to wait for the GPS quiet time to do the ping. Otherwise, the ping process will cause characters to be lost.
Other problems:
You are printing the speed value even though it may not be valid. If you are not moving, or you do not have good satellite reception, the GPS device may not provide a speed.
The Arduino millis() clock will not be synchronized with the GPS clock. You could use the GPS updates as an exact 1-second clock. Simply count 5 fixes as they arrive, and this will mean that 5 seconds have elapsed.
You should use a different serial port and/or library.
This answer describes the various choices: HardwareSerial (i.e. Serial on pins 0 & 1), AltSoftSerial (8 & 9 on an UNO) or NeoSWSerial (any two pins).
Here is a NeoGPS version of your sketch that addresses these issues:
/*********************
*10 to GPS Module TX*
*09 to GPS Module RX*
*********************/
// 1.TESTED USING LED
// 2. added ultrasound libraries
#include <NewPing.h>
#define TRIGGER_PIN 5 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN 4 // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 400 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.
#include <NeoSWSerial.h>
#include <NMEAGPS.h>
NeoSWSerial gpsPort(10, 11);
NMEAGPS gps; // the parser
gps_fix fix; // all the parsed values from GPS
uint8_t fixCount = 0; // a one-second "clock"
float gpsdump();
void setup()
{
// Open serial communications and wait for port to open:
Serial.begin(9600);
// set the data rate for the SoftwareSerial port
gpsPort.begin(9600);
delay(1000);
}
void loop() // run over and over
{
// Check for available GPS characters and parse them
if (gps.available( gpsPort ))
{
// Once per second, a complete fix structure is ready.
fix = gps.read();
fixCount++;
// The GPS device is going to be quiet for a while,
// *now* is a good time to do a ping.
Serial.print( "ping " );
Serial.println( sonar.ping_cm() );
// Every 5 seconds we print an update
if (fixCount >= 5)
{
fixCount = 0; // reset counter
Serial.println("Acquired Data");
Serial.println("-------------");
gpsdump();
Serial.println("-------------");
Serial.println();
}
}
}
float gpsdump()
{
// On Arduino, GPS characters may be lost during lengthy Serial.print()
// On Teensy, Serial prints to USB, which has large output buffering and
// runs very fast, so it's not necessary to worry about missing 4800
// baud GPS characters.
Serial.println("speed ");
if (fix.valid.speed)
Serial.println( fix.speed_kph() );
}
If you want to try it, NeoGPS, AltSoftSerial and NeoSWSerial are available from the IDE Library Manager, under the menu Sketch -> Include Library -> Manage Libraries. NeoGPS is smaller, faster, more reliable and more accurate than all other libraries.
Even if you don't use it, there are many suggestions on the Installation and Troubleshooting pages.
I am trying to send an echo from a shell script on some event.
echo naval > /dev/cu.usbmodem1421
on this /dev/cu.usbmodem1421 serial port my Blend Micro Atmega32u4 Board is listening.
But every time I send an echo it says, resource busy.
I am not sure what can be the solution?
Arduino code:
int incomingByte = 0; // for incoming serial data
void setup() {
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
}
void loop() {
// send data only when you receive data:
if (Serial.available() > 0) {
// read the incoming byte:
incomingByte = Serial.read();
// say what you got:
Serial.print((char)incomingByte);
}
}
have you tried killing the process ?, it seems it is hanging waiting a bit broad of a question but it could be caused by numerous things.