I want to communicate between 2 Pi Pico's using I2C. I want to do program these with the Arduino IDE. I have tried using Wire.h and some examples I found online. However, they don't seem to be able to connect to each other.
This is my Master code:
#include "Wire.h"
void setup() {
Wire.begin();
Serial.begin(9600);
bool setSDA(1);
bool setSCL(2);
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);
}
void loop() {
Wire.requestFrom(8, 6);
Serial.println("Waiting...");
while (Wire.available()) {
char c = Wire.read();
Serial.print(c); }
delay(500);
}
This is my slave code:
#include "Wire.h"
void setup() {
Wire.begin(8);
Wire.onRequest(requestEvent);
Serial.begin();
bool setSDA(1);
bool setSCL(2);
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);
}
void loop() {
delay(100);
Serial.println("Recieving...");
}
void requestEvent() {
Wire.write("hello ");
}
What am I doing wrong?
Related
I am attempting to upload my code to the ATTiny85, but whenever I do, I get this error.
Here is the error:
error: ISO C++ forbids declaration of 'str' with no type [-fpermissive]
void sendPronto(const __FlashStringHelper *str, unsigned int times = 1U);
Here is the code:
#include <IRremote.h>
int IRpin = 1;
IRrecv IR(IRpin);
//Motor 1 (Right) Backward Pin
const byte MOTOR1_BWD = 2;
//Motor 1 (Right) Forward Pin
const byte MOTOR1_FWD = 3;
decode_results cmd;
int speedpin = 5;
const byte spd = 255;
void stop() {
digitalWrite(MOTOR1_BWD, LOW);
digitalWrite(MOTOR1_FWD, LOW);
}
void back() {
digitalWrite(MOTOR1_BWD, HIGH);
digitalWrite(MOTOR1_FWD, LOW);
analogWrite(speedpin, spd);
}
void forward() {
digitalWrite(MOTOR1_BWD, LOW);
digitalWrite(MOTOR1_FWD, HIGH);
analogWrite(speedpin, spd);
}
void setup() {
IR.enableIRIn();
pinMode(MOTOR1_BWD, OUTPUT);
pinMode(MOTOR1_FWD, OUTPUT);
digitalWrite(MOTOR1_BWD, LOW);
digitalWrite(MOTOR1_FWD, LOW);
stop();
}
void loop() {
IR.resume();
if (cmd.value == 0xFF906F) {
forward();
}
if (cmd.value == 0xFFA25D) {
stop();
}
if (cmd.value == 0xFFE01F) {
back();
}
}
I copy pasted your code and it compiled just fine for the ATTiny85. Try redownloading that library using the library manager in the IDE
Need your help again: I'm doing this time Master - Slave Using SPI communication, there is no error in the code when I simulate the code but the LED won't turn on.
The supposed outcome that should happen is that when I push the push button on master board the LED on the slave board will turn on.
Master code:
// Master Board
#include <SPI.h>
#define button1 4
#define SS 10
int buttonvalue;
int x;
void setup(void) {
Serial.begin(115200); //set baud rate to 115200 for usart
digitalWrite(SS, HIGH); // disable Slave Select
SPI.begin ();
SPI.setClockDivider(SPI_CLOCK_DIV8); //divide the clock by 8
}
void loop(void) {
digitalWrite(SS, LOW);
buttonvalue = digitalRead(button1);
if (buttonvalue == HIGH) {
x = 1;
} else {
x = 0;
}
digitalWrite(SS, HIGH);
delay(1000);
}
Slave code:
// Slave Board
#include <SPI.h>
#define led1 2
volatile byte Slavereceived;
volatile boolean received;
int x;
void setup(void) {
Serial.begin(115200);
pinMode(2, OUTPUT);
pinMode(MISO,OUTPUT);
SPCR |= _BV(SPE);
received = false;
SPI.attachInterrupt();
}
ISR (SPI_STC_vect) {
Slavereceived = SPDR;
received = true;
}
void loop() {
if (received) {
if (Slavereceived == 1) {
digitalWrite(led1, HIGH);
} else {
digitalWrite(led1, LOW);
}
delay(1000);
}
}
I too was stuck in the same situation, there is no support for the SPI library in tinkercad, you can include it without errors, and even use it, but any useful command will let the code stuck at that command
Sorry, but there no much you can do
this link if for a tinkercad forum, where one of the people said SPI library amoung two others are not supported
Add SPI.transfer(x); below the if else to your master code.
The master code will look somewhat like this:
// Master Board
#include <SPI.h>
#define button1 4
#define SS 10
int buttonvalue;
int x;
void setup(void) {
Serial.begin(115200); //set baud rate to 115200 for usart
digitalWrite(SS, HIGH); // disable Slave Select
SPI.begin ();
SPI.setClockDivider(SPI_CLOCK_DIV8); //divide the clock by 8
}
void loop(void) {
digitalWrite(SS, LOW);
buttonvalue = digitalRead(button1);
if (buttonvalue == HIGH) {
x = 1;
} else {
x = 0;
}
SPI.transfer(x);
digitalWrite(SS, HIGH);
delay(1000);
}
I want to use bluetooth connection to control, how long something is on. So I read the Serial Input. If it is a number, I take the number and put it into a delay. After it is through, I write something and check again. If the Serial Read is not a number, it should turn off. in The problem is, the led keeps running. Do you see, what is my mistake?
#include <SoftwareSerial.h>
#define ledPin 13
#define rxPin 10
#define txPin 11
SoftwareSerial btSerial(rxPin, txPin);
int btData;
void setup() {
btSerial.begin(9600);
btSerial.println("bluetooth available");
pinMode(ledPin,OUTPUT);
serv.attach(3);
serv2.attach(5);
}
void loop() {
if (btSerial.available()){
btData = btSerial.read();
if(isDigit(btData)){
digitalWrite(ledPin,1);
btSerial.println("LED on Pin is on");
delay(btData*10);
}
else {
digitalWrite(ledPin,0);
btSerial.println("LED on Pin is off");
}
}
delay(100);
}
Try to use this:
#include <SoftwareSerial.h>
#define ledPin 13
#define rxPin 10
#define txPin 11
SoftwareSerial btSerial(rxPin, txPin);
int btData;
void setup() {
btSerial.begin(9600);
btSerial.println("bluetooth available");
pinMode(ledPin,OUTPUT);
serv.attach(3);
serv2.attach(5);
}
void loop() {
if (btSerial.available())
btData = btSerial.read();
if(isDigit(btData)){
digitalWrite(ledPin,1);
btSerial.println("LED on Pin is on");
delay(btData*10);
}
else {
digitalWrite(ledPin,0);
btSerial.println("LED on Pin is off");
}
delay(100);
}
And the reason is because the enabling and disabling was done only when there is serial data and if you put the if anywhere else it would be checked always.
Is it possible to turn the build in LED solid "ON" on the ESP8266 ESP-01?
On the Arduino UNO REV.3 this code works, it sets the LED_BUILTIN to glow sold "ON":
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);
}
void loop() {
}
On the ESP8266 ESP-01 this code works for blinking its built in LED:
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
digitalWrite(LED_BUILTIN, LOW);
delay(1000);
digitalWrite(LED_BUILTIN, HIGH);
delay(2000);
}
But I can not get it to be just solid "ON".
Try this
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, LOW);
}
void loop() {
}
Yes, it works the other way around. The LED will turn on with digitalWrite(LED_BUILTIN, LOW);.
I have a simple setup with two Arduinos and a 433MHz transmitter and a receiver module.
The transmitter is set to transmit a string on button press, that side works correctly.
On the receiver end I have a simple program that's just writing whatever it's receiving to serial:
#include "VirtualWire.h"
int rx_pin = 2;
void setup(){
Serial.begin(9600);
Serial.println("serial ready");
vw_set_rx_pin(rx_pin);
vw_setup(2000);
vw_rx_start();
Serial.println("receiver ready");
}
void loop(){
uint8_t msg[VW_MAX_MESSAGE_LEN];
uint8_t msglen = VW_MAX_MESSAGE_LEN;
vw_wait_rx();
if(vw_get_message(msg, &msglen)){
Serial.print("Got: ");
for (int i = 0; i < msglen; i++)
{
Serial.print(char(msg[i]));
}
Serial.println();
}
}
When I then monitor serial, the receiving Arduino seems to receive the message twice each time it's sent. I used an oscilloscope to verify (to the best of my knowledge) that the transmitter is only sending the message once, I also tried wiring the two Arduinos together to make sure the issue is not with the RF modules, I got the same results.
This makes me think there is an issue with my code or with VirtualWire itself.
I'm thinking that I should somehow check if I've received the same message already or I should clear VirtualWire's buffer, how would I do either of those?
EDIT:
Here is the transmitter code:
#include "VirtualWire.h"
int tx_pin =2;
int interruptPin = 3;
volatile bool transmitBool = false;
void setup(){
vw_set_tx_pin(tx_pin);
vw_setup(2000);
pinMode(interruptPin, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(interruptPin), transmit, LOW);
pinMode(13, OUTPUT);
digitalWrite(13, LOW);
transmitBool = false;
}
void loop(){
if(transmitBool) {
transmitBool = false;
digitalWrite(13, HIGH);
vw_send((uint8_t *)"abc", 4);
vw_wait_tx();
delay(500);
digitalWrite(13, LOW);
}
}
void transmit() {
transmitBool = true;
}