I have recently been trying to pneumatically actuate a cylinder using a 12 V double solenoid and an Arduino Uno. The solenoid works when tested without code and wiring, however when I try to actuate the cylinder using code, nothing happens. I have a feeling that the way in which I wired everything to the breadboard may be incorrect, so I was wondering if anyone had any tips or good schematics by which I could wire it all together.
The materials I am using are two PNP transistors, two resistors, two diodes, and then the actual solenoid and similar hardware. My code is just a simple LED blink code which can be used to send signals to the solenoids, so I do not believe that is the issue. However, I have attached it underneath just in case.
int solenoid1 = 4;
int solenoid2 = 5;
void setup() {
// put your setup code here, to run once:
pinMode(solenoid1, OUTPUT);
pinMode(solenoid2, OUTPUT);
}
void loop() {
// put your main code here, to run repeatedly:
digitalWrite(solenoid1, HIGH);
delay(1000);
digitalWrite(solenoid1, LOW);
digitalWrite(solenoid2, HIGH);
delay(1000);
digitalWrite(solenoid2, LOW);
}
Arduino digital pin puts 5V when HIGH. So your 12V solenoid do not get enough voltage to run. You have to use relay and additional 12V power supply to run your solenoid with Arduino.
The code which I have written is not running when the Arduino gets plugged in
How can you see this?
A solenoid certainly cannot be controlled by 5V * 20mA from an Arduino pin. Further requirements depend on the solenoid you want to use. (Current consumption, free-wheeling diode already integrated?)
Related
for a prototype we need to have a hardware switch (e.g., a momentary pushbutton) trigger the taking of a screenshot on a PC and save it to file. Writing some windows software to take a screenshot and save it is trivial, the slightly trickier part is how to get an electrical signal (we can choose the voltage, and provide power as necessary) to the software. We absolutely want to keep this simple (i.e., no labview or anything) and reliable as possible. I see small module boxes such as this
https://labjack.com/products/u3?gclid=EAIaIQobChMI-MXkjcbB2gIVxVYNCh3C6AODEAQYAiABEgK_OvD_BwE
available, but are there even simpler solutions? I'm thinking of (but haven't taken the time to test) possibly a parallel-port-to-USB converter (which would be similar to the more common RS232-to-USB converter but may allow detection of individual high/lows(just a guess, never worked with a parallel driver from windows)), or something like that. Just querying for ideas before I spend time buying things and testing. Thanks!
This can be easily done with an Arduino Leonardo, Micro, and Due module. This page has an example very similar to your project:
// use this option for OSX:
char ctrlKey = KEY_LEFT_GUI;
// use this option for Windows and Linux:
// char ctrlKey = KEY_LEFT_CTRL;
void setup() {
// make pin 2 an input and turn on the
// pullup resistor so it goes high unless
// connected to ground:
pinMode(2, INPUT_PULLUP);
// initialize control over the keyboard:
Keyboard.begin();
}
void loop() {
while (digitalRead(2) == HIGH) {
// do nothing until pin 2 goes low
delay(500);
}
delay(1000);
// new document:
Keyboard.press(ctrlKey);
Keyboard.press('n');
delay(100);
Keyboard.releaseAll();
// wait for new window to open:
delay(1000);
}
I'm working on a room visualization project, similar to this (taken from this video):
Im using LeddarVu8 from leddartech (see image below), arduino uno (with rs485shield):
I've also used the code provided from leddartech of simple16channel (no lcd):
#include "C:\Program Files (x86)\Arduino\libraries\Leddar.h"
/*
Simple Leddar(TM) Example - Without LCD
Language: Arduino
This program lists the detections read on the serial port of the Arduino.
Can be used with Arduino IDE's Serial Monitor.
Shields used:
* RS-485 Shield
Created 01 Jun. 2015
by Pier-Olivier Hamel
This example code is in the public domain.
*/
Leddar16 Leddar1(115200,1);
//Baudrate = 115200
//Modbus slave ID = 01
void setup()
{
//Initialize Leddar
Leddar1.init();
}
void loop()
{
char result = Leddar1.getDetections();
if (result >= 0)
{
for (int i = 0; i < Leddar1.NbDet; i++)
{
Serial.print("Segment: ");
Serial.print(Leddar1.Detections[i].Segment);
Serial.print(" Distance: ");
Serial.print(Leddar1.Detections[i].Distance);
Serial.print("\n");
}
}
else
{
Serial.print("Error: ");
Serial.print((int)result);
Serial.print("\n");
}
delay(50);
}
(from https://support.leddartech.com/downloads/files/89-leddarsdk3-2-0-pi2-tar-gz)
The problem is that serial monitor of the arduino only outputs a series of ?????. Why is that?
The problem is that serial monitor of the arduino only outputs a series of ?????. Why is that?
Because you have connected the TX of the LIDAR to the TX of the Arduino. The Serial Monitor window "listens" to the Arduino TX pin (via USB), so the Serial Monitor is actually listening to the LIDAR. The LIDAR serial is running at 115200, but your Serial Monitor is probably set to 9600. When the baud rates don't match, you'll get garbage characters.
Also notice that you have two serial TX pins connected to each other. This will also corrupt the characters if the Arduino and the LIDAR both try to transmit at the same time.
You may be able to connect the LIDAR RX to the Arduino TX, and the LIDAR TX to the Arduino RX. This would allow you to see the Leddar library commands on the Serial Monitor window. It would also cause all Serial prints to go to the LIDAR (and the PC). This might be ok if the Leddar command packets have a special format. This would allow the Leddar to ignore your debug prints, because they would not formatted correctly.
In that configuration, you would have to disconnect Arduino pin 0 to upload new sketches over USB. Some people put a switch in that wire to make it easy to disconnect.
I am currently learning the PIC. I am using PIC18F46K22. I want to send commands from my phone to the PIC using Bluetooth HC06 Module. On Arduino, everything works fine. However, when i switch to PIC, it isnt working. It is connecting but the Rx and Tx dont perform. After comparing with the arduino code, the only problem i see is the blueooth initialization. I have connected the Tx and Rx pins of bluetooth to Rx and Tx of the PIC, respectively. All the websites i read are the same, and i already tried them so i am clueless what to do. Please, any help in what is the probelm is much much appreciated.
This is my code:
char receive;
void main(){
TRISA=0x00;
ANSELA=0;
PORTA.F0=0;
UART1_Init(9600);
Delay_ms(100);
while(1){
if (UART1_Data_Ready()) {
receive = UART1_Read();
if (receive=='1') {
PORTA.F0=1;
}
else{
PORTA.F0=0;
}
}
}
}
First,you didnt say what compiler you are using? Did u make debug your code ? Maybe your clock settings are wrong. And it is due to set wrong baudrate. Check your initializing for uart.
You have a very simple mistake, and that should be the problem. PORTC is by default initialized as an analog Port. Therefore, Tx and Rx pins do no perform their function. In order to disable PORTC as analog (configure as digital), with PIC18F46K22, the function would be ANSELC=0;
Hope that helps!
I started adventure with arduino and programming 2 months ago.So, I am new in this topics.
Until now I realized few projects including Blynk connected with arduino. The last one was similar to one described in topic but I used the ENC28j60 instead of ESP8266 module and then it worked fine.
The problem started with ESP module.
Short description of project:
The main idea is to control AC light with Blynk App support.
First of all I made a connection according to picture below:
As power source I used the USB phone charger connected with step by voltage converter to get in final the 3.3V source.
I additionally connected the Arduino Uno with relay module like this:
Arduino ====> Relay module
5V ====> VCC
GND ====> GND
Pin 5 ====> IN1
Everythink you can see in pictures below (sorry for quality)
And for now I did almost every step (with so many problems). Here I mean:
1. I checked if arduino is connected with ESP module by serial port -> system report "ready" status.
2. I upload the below (template) Arduino IDE sketch for my project:
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "***";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "***";
char pass[] = "***";
void setup()
{
// Debug console--
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
}
void loop()
{
Blynk.run();
}
And finally I started the New project in Blynk. I set the Arduino uno as a hardware model and WiFi as connection type. Then I added the Button and set the Output to D5.
And now (close to the end of project) I met with a problem. After pushing the connect button (in up-right corner) I receive the information that device is connected (Online). Then when I try to push the button to Active Relay - nothing happens.
Whats more. I tried with different pins on Arduino with the same results. And I don't know why (probably because I have still small knowladge) but when I set the Button output value to D2 - after connection when I push it then the diode on ESP module Turn OFF and Turn ON.
I tried to find solution on this forum and in many other places for last 3 days but without any results. That's why I decided to ask You for help. Do you know what did I wrong or what should I add to project to make connection between the Blynk and relay work correct?
Write if you will need some more or detailed information from my side.
Why are you using both the uno and the esp? You can just use the esp instead of the combo, will make your project less power hungry and smaller. If you wonder about using just the esp, you can use the nodemcu boards (which can be found for less that 4€ per unit in China).
I've some example sketches for this (with temperature and humidity), if you want to take a look at those.
When looking at the pictures and code you have postet, it seems that you have flashed the ESP with a Arduino sketch. This is fine if you would like to activate the relay directly with the ESP (without the Arduino UNO).
Then you just have to connect the relay to the ESP instead of to the Arduino. Unfortunately not all relay boards can operate with the 3.3V logic that the ESP supplies, but maybe you'r lucky.
On the other hand, if you would like to use the Arduino UNO with the ESP as Wi-Fi, then you would have to reflash the ESP with the original AT firmware. Then you could connect it to the Arduino and use a sketch that looks something like this.
#define BLYNK_PRINT Serial
#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>
char auth[] = "YourAuthToken";
char ssid[] = "YourNetworkName";
char pass[] = "YourPassword";
#include <SoftwareSerial.h>
SoftwareSerial EspSerial(2, 3);
// pin 3 connected to ESP RX and pin 2 connected to ESP TX
// Your ESP8266 baud rate:
#define ESP8266_BAUD 115200
ESP8266 wifi(&EspSerial);
void setup()
{
// Debug console
Serial.begin(9600);
delay(10);
// Set ESP8266 baud rate
EspSerial.begin(ESP8266_BAUD);
delay(10);
Blynk.begin(auth, wifi, ssid, pass);
}
void loop()
{
Blynk.run();
}
And you should remove the connection between RST and GND on the Arduino
I'm doing a small project, where I want to transmit a text via a cable to my Atmega328p.
I first created the project on an Arduino Uno (with pure C), where the transmission works.
Now I switched to a standalone 328p and tried it there.
But now the Problem is, that my RX-Complete Interrupt is fired too early. In fact it is even fired, when nothing has been transmitted. It will fired when I just touched the cable (the isolated parts) .
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/setbaud.h>
void setup(void){
CLKPR = 0;
//Set Output
DDRC |= (1 << PC0) | (1 << PC1) |(1 << PC2) |(1 << PC3) |(1 << PC4) | (1 << PC5);
DDRD |= (1 << PD6) | (1 << PD7);
// Interrupts
sei();
// Init UART
// Set baud
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
#if USE_2X
UCSR0A |= (1 << U2X0);
#else
UCSR0A &= ~(1 << U2X0);
#endif
// Enable UART Receive and Receivecomplete Interrupt
UCSR0B = (1<<RXEN0) | (1 << RXCIE0);
// Set frameformat to 8 Data and 1 Stopbit
UCSR0C = ((1<<UCSZ00)|(1<<UCSZ01));
}
int main(void){
setup();
while(1){
}
return 0;
}
ISR(USART_RX_vect){
// Enable some LEDs
}
Edit: Picture of my Setup:
I use the Arduiono just for Powering my Breadboard. 5V and GND are connected.
The AVR MKII ISP is Connected via some Pins to flash the µC. The two cables are used for UART RX.
The Pushbutton is just for RESET
Edit 2: I just tried to power it via an external source and a raspberrypi. There is the same effect everywhere
Of course. RXC flag is set when there are unread data in the receive buffer.
This flag is used to generate the RX interrupt.
Since you never read UDR inside your interrupt, this flag remains set, and, therefore just after interrupt routine is completed, it is starts again. And again. And again....
The Rx line should not be floating. Its a high impedance input and should be driven to a specific level. Your cables act like an antenna and if you touch the cable it gets worse because there is capacitive coupling between the cable and your body. This may result in high frequency noise on your input which may trigger the Rx interrupt.
Further make sure that the 328p local power supply is properly decoupled. I don't see any capacitors near the controller on your breadboard. Check GND connection between Arduino and 328p (mandatory).
Without looking at your setup it's hard to tell what's going wrong, but if you're touching an isolated cable and getting a response from the processor, then I would check common grounds between the devices if you're powering the ATMega via a battery, make sure the battery ground is touching the device that's receiving and transmitting, as any potential difference in power levels could cause the little magnetic field that you give off to be amplified into something that the core registers as a high bit.If possible, post a picture of your setup!
Also when programming with ATMel chips, burning the arduino bootloader and going the simple(r) C code way never hurt.