If a sensor is connected to I2C bus then both the following device tree entries will workt or only entry1 will work.
entry1:
-------
i2c {
clock-frequency = <200000>;
sensor1#addr {
compatible = "sensor1"
};
};
entry2:
-------
i2c {
clock-frequency = <200000>;
}
sensor1#addr {
compatible = "sensor1"
};
As sensor is connected to I2C bus, entry1 seems to be fine as sensor is a child node of the your I2C bus node.
Also I expect to see in DT entry; on which I2C bus the sensor in hooked.Its not clear in entry1.
Related
I want to check if communication is working between my SerialMonitor in Arduino IDE and BLE controller.
I typed command AT to my SerialMonitor and it suppose to return OK response but nothing happened.
This is scheme what I used:
Code:
#include <SoftwareSerial.h>
SoftwareSerial bleSerial(2, 3); // RX, TX
void setup() {
//initialize serial port for logs
Serial.begin(9600);
while (!Serial) {
}
bleSerial.begin(9600);
}
void loop() {
if (bleSerial.available()) {
Serial.write(bleSerial.read());
}
if (Serial.available()) {
bleSerial.write(Serial.read());
}
}
UPDATE:
Changed values for SoftwareSerial bleSerial(3, 2); // RX, TX still doesnt work.
UPDATE2:
I've tried switching pins and code, nothing works. I should at least see HM-10 controller in my bluetooth devices on my Android phone, but I cant see anything.
UPDATE3:
I've used code from this Stackoverflow post and its working fine. I can finally see controller in my bluetooth devices on my Android phone also It returned name MLT-BT05 after AT+NAME? command. Looks like you have to read message per char and put delay 10ms between chars, otherwise it will not be possible to read message from BLE controller. That was the only problem.
You should connect RX-TX and TX-RX (not RX-RX and TX-TX like your graphic shows) so change the cables and the code from
SoftwareSerial bleSerial(2, 3); // RX, TX
to
SoftwareSerial bleSerial(3, 2); // RX, TX
Connect according to this graphic (incl voltage divider)
Abd use the following sketch to test (read comments for details):
// SerialIn_SerialOut_HM-10_01
//
// Uses hardware serial to talk to the host computer and AltSoftSerial for communication with the bluetooth module
//
// What ever is entered in the serial monitor is sent to the connected device
// Anything received from the connected device is copied to the serial monitor
// Does not send line endings to the HM-10
//
// Pins
// BT VCC to Arduino 5V out.
// BT GND to GND
// Arduino D8 (SS RX) - BT TX no need voltage divider
// Arduino D9 (SS TX) - BT RX through a voltage divider (5v to 3.3v)
//
#include <SoftwareSerial.h>
SoftwareSerial BTserial;
char c=' ';
bool NL = true;
void setup()
{
Serial.begin(9600);
Serial.print("Sketch: "); Serial.println(__FILE__);
Serial.print("Uploaded: "); Serial.println(__DATE__);
Serial.println(" ");
BTserial.begin(9600);
Serial.println("BTserial started at 9600");
}
void loop()
{
// Read from the Bluetooth module and send to the Arduino Serial Monitor
if (BTserial.available())
{
c = BTserial.read();
Serial.write(c);
}
// Read from the Serial Monitor and send to the Bluetooth module
if (Serial.available())
{
c = Serial.read();
if (c!=10 & c!=13 )
{
BTserial.write(c);
}
// Echo the user input to the main window. The ">" character indicates the user entered text.
if (NL) { Serial.print("\r\n>"); NL = false; }
Serial.write(c);
if (c==10) { NL = true; }
}
}
I try to connect an NXP i.MX7D running Android Things to a Arduino UNO using I2C. The slave code is fairly simple :
#include <Wire.h>
void setup() {
Wire.begin(0x08); // join i2c bus with address #8
Wire.onRequest(requestEvent); // register event
}
void loop() {
delay(100);
}
// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent() {
Wire.write("hello "); // respond with message of 6 bytes
// as expected by master
}
The two devices are connected like this:
NPX SDA Pin ---> 3.3v level converter 5v ----> Arduino PIN A4
NPX SCL Pin ---> 3.3v level converter 5v ----> Arduino PIN A5
When I use the PIO tool I can't seem to connect or read the Arduino slave. There is two BUS (I2C1, I2C2) on the NPX I tried both with the same result:
imx7d_pico:/ $ pio i2c I2C1 0x08 read-reg-byte 0x00
[WARNING:client_errors.cc(35)] error 6: No such device or address
6|imx7d_pico:/ $ pio i2c I2C2 0x08 read-reg-byte 0x00
[WARNING:client_errors.cc(35)] error 6: No such device or address
I assume the level converter work properly I did have limited success with UART connection (Arduino was able to emit to NPX but not NPX to Arduino, will investigate this after)
Here are some pictures of the connection.
Try to add on Wire.onReceive callback(together with onRequest) to your arduino code.
Like this:
#include <Wire.h>
void setup() {
Wire.begin(8); // join i2c bus with address #8
Wire.onReceive(receiveEvent); // register event
Serial.begin(9600); // start serial for output
}
void loop() {
delay(100);
}
// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany) {
while (1 < Wire.available()) { // loop through all but the last
char c = Wire.read(); // receive byte as a character
Serial.print(c); // print the character
}
int x = Wire.read(); // receive byte as an integer
Serial.println(x); // print the integer
}
I'm trying to get my arduino GSM shield working with the example "Send SMS" code provided. However, when I upload and compile the program, the serial monitor displays "SMS Messages Sender" and nothing else occurs.
I am using Arduino uno r3 and gsm sim 900. powered gsm with 5V 1.5A. I have connected arduino pins 7&8 to pins 7&8 of gsm. I have connected the gsm to ground too.
When I use SoftwareSerial.h it works. But I wish to use GSM.h library which now isn't working. Any help please
// include the GSM library
#include <GSM.h>
// PIN Number for the SIM
#define PINNUMBER ""
// initialize the library instances
GSM gsmAccess;
GSM_SMS sms;
// Array to hold the number a SMS is retrieved from
char senderNumber[20];
void setup() {
// initialize serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.println("SMS Messages Receiver");
// connection state
bool notConnected = true;
// Start GSM connection
while (notConnected) {
if (gsmAccess.begin(PINNUMBER) == GSM_READY) {
notConnected = false;
} else {
Serial.println("Not connected");
delay(1000);
}
}
Serial.println("GSM initialized");
Serial.println("Waiting for messages");
}
void loop() {
char c;
// If there are any SMSs available()
if (sms.available()) {
Serial.println("Message received from:");
// Get remote number
sms.remoteNumber(senderNumber, 20);
Serial.println(senderNumber);
// An example of message disposal
// Any messages starting with # should be discarded
if (sms.peek() == '#') {
Serial.println("Discarded SMS");
sms.flush();
}
// Read message bytes and print them
while (c = sms.read()) {
Serial.print(c);
}
Serial.println("\nEND OF MESSAGE");
// Delete message from modem memory
sms.flush();
Serial.println("MESSAGE DELETED");
}
delay(1000);
}
i expected this code to enable me to receive message and i can modify it to store the message in variables
Your problem is probably the wiring.
Your board (Arduino UNO R3) has its UART (the one you intend to use when you define Serial.begin(9600) on pins 0 RX and 1 TX. See here for the schematic and picture below (top right corner with tags TX and RX).
Software emulated serial works because you're defining pins 7 and 8 to be the emulated UART TX and RX signals.
I am using GSM 900A modem which requires 5V Supply. I am connecting it to Arduino UNO. I am giving supply to modem by arduino 5V and GND pin. I am connecting RXD pin to TX(pin 1) of arduino TXD pin to RX(pin 0) of arduino and GND to GND of arduino i.e. pin 14. I am running the basic example codes but GSM is not responding. I have also tried other softwares like Putty but I am unable to write any AT command Please help me. When I tested the modem using this code:
/*
This example tests to see if the modem of the
GSM shield is working correctly. You do not need
a SIM card for this example.
Circuit:
* GSM shield attached
Created 12 Jun 2012
by David del Peral
modified 21 Nov 2012
by Tom Igoe
http://www.arduino.cc/en/Tutorial/GSMToolsTestModem
This sample code is part of the public domain
*/
// libraries
#include <GSM.h>
// modem verification object
GSMModem modem;
// IMEI variable
String IMEI = "";
void setup() {
// initialize serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// start modem test (reset and check response)
Serial.print("Starting modem test...");
if (modem.begin()) {
Serial.println("modem.begin() succeeded");
} else {
Serial.println("ERROR, no modem answer.");
}
}
void loop() {
// get modem IMEI
Serial.print("Checking IMEI...");
IMEI = modem.getIMEI();
// check IMEI response
if (IMEI != NULL) {
// show IMEI in serial monitor
Serial.println("Modem's IMEI: " + IMEI);
// reset modem to check booting:
Serial.print("Resetting modem...");
modem.begin();
// get and check IMEI one more time
if (modem.getIMEI() != NULL) {
Serial.println("Modem is functoning properly");
} else {
Serial.println("Error: getIMEI() failed after modem.begin()");
}
} else {
Serial.println("Error: Could not get IMEI");
}
// do nothing:
while (true);
}
I am getting this output on Serial Monitor for 9600 baud rate:
Starting modem test...ERROR, no modem answer. Checking IMEI...Modem's IMEI: 0 Resetting modem...Modem is functioning properly
I think it has to do with your supply, try using an adapter, that outputs a current of 500mA to 1A.
I am trying to get my ESP8266's connect and send messages over an i2c bus. I am using a NodeMcu Development Board. Pins D1,D2 and GND are connected to each other.
The code on my master is :
#include <Wire.h>
void setup() {
Wire.begin(D1,D2); // join i2c bus (address optional for master)
Serial.begin(115200);
}
byte x = 0;
void loop() {
Wire.beginTransmission(8);
Wire.write(x); // sends one byte
Wire.endTransmission(); // stop transmitting
Serial.println("Transmitted");
x++;
delay(500);
}
And the code on my slave ESP is:
#include <Wire.h>
void setup() {
Wire.begin(8); // join i2c bus with address #8
Wire.onReceive(receiveEvent); // register event
Serial.begin(115200); // start serial for output
}
void loop() {
delay(100);
}
// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany) {
Serial.println("Received..");
/*
while (1 < Wire.available()) { // loop through all but the last
char c = Wire.read(); // receive byte as a character
Serial.print(c); // print the character
}
*/
int x = Wire.read(); // receive byte as an integer
Serial.println(x); // print the integer
}
Running this gives no output on the receiver chip.
As mentioned in the comments it doesn't look like I2C is supported, but you could use PJON
You just need to connect a single wire to enable communication between the two devices
I'm not sure but I would expect the Wire library from Arduino to use the hardware I2C controller for ATMega. The I2C driver in the firmware from Espressif seems to be doing I2C over GPIO, that would hint there is no hw controller on ESP (what are the odds they would be the same anyway). So you need to use something else than Wire.h, thus I would suggest - try downloading something that fakes I2C over GPIO for your Arduino IDE. Like this .. maybe, I haven't tried that out. I know not a complete solution, but maybe at least this helps.. good luck!
ESP8266(I2C Master) to ESP8266(I2C Slave) works from version 2.5.0. Check out my comments on the ESP8266 GitHub