Arduino Archives - Page 3 of 5 - MicroController Electronics

Jun 20 2016

LM317 to output 3.3 Volts

By earl in Arduino, Circuits, Informational, Modules, Pinguino

I created a simple circuit using the LM317 to output 3.3 volts from a 5V or greater input voltage. Why? Because, a number of modules for the Arduino (or Pinguino) take 3.3 Volts. It’s true, some of the Arduinos do have a 3.3V voltage regulator (and thus a source of 3.3V), however, that might not …

15 comments

May 27 2016

FS1000A Wireless RF433 Transmit and Receive Module Pair

By earl in Arduino, Informational, Modules

FS1000A RF433 Transmit and Receive Modules

I like experimenting with wireless devices, as you can tell from the many posts about them here! 😎 I am trying out an FS1000A Wireless RF433 Transmit and Receive Module pair this time. They use use the RF 433Mhz frequency with ASK modulation. (You can also get these with the 315Mz frequency instead.) I got …

RF, RF433, Wireless
9 comments

May 24 2016

NL6621-Y1 Wireless Module

By earl in Arduino, Informational, Modules, NL6621

There is a new kid on the block, the NL6621-Y1 Wireless Module from Nufront. The NL6621 WiFi SOC is powered by a 160 MHz ARM Cortex-M3 (NL6621M). Everything is integrated in the NL6621M SOC including 448KB of RAM. Here is what the NL6621-Y1 wireless module looks like: Supposedly it is …

May 20 2016

How to Power an LED (Arduino vs. Pinguino)

By earl in Arduino, Informational, Pinguino

How to Power an LED (Arduino vs. Pinguino) might seem silly, however, if you take a look at the following graphic, you will hopefully notice something interesting. The Pinguino sources the power to the ‘user’ LED differently that does an Arduino. The Pinguino wiring is represented by the green LED and the Arduino wiring is …

Leave comment

May 13 2016

I2C Wire Chat Between Two Arduinos

By earl in Arduino, Informational

Someone asked me the other day if it was possible to have a ‘chat’ between Arduinos using the I2C Wire library. I came up with ‘proof of concept’ code called ‘I2C Wire Chat Between Two Arduinos’. Here is the sketch: I2C Wire Chat Between Two Arduinos

/* 
 
 I2C wire chat
 From: earl@microcontrollerelectronics.com

 Analog Pin 5 SCL
 Analog Pin 4 SDA
 Common ground

*/

#include <Wire.h>
#define WireDevice 8

String buffer;
int mode;

void setup() { Serial.begin(9600); }

void loop() {
  while (Serial.available()) {
    char c = Serial.read();
    if (c != '\n') {
      if (c == '\r') continue;
      buffer += c;
      continue;
    }
    else {  
      buffer += '\0';
      if (buffer[0] == '#') {
        if (buffer[1] == 'm') {
          if (mode != 'm') {
            mode = 'm';
            master();
            Serial.println("Master mode");
          }
        }
        if (buffer[1] == 's') {
          if (mode != 's') {
            mode = 's';
            slave();
            Serial.println("Slave mode");
          }
        }
        buffer = "";
        continue;
      }
      if (mode == 'm') {
        Wire.beginTransmission(WireDevice); 
        int i = 0;
        while (buffer[i]) { Wire.write(buffer[i]); i +=1; }
        Wire.endTransmission();    
      }
      else Serial.println("Invalid Mode");
      buffer = "";
    } 
  }
}

void master() {
  Wire.begin();
  Serial.println("Master Initialized");
}

void slave() {
  Wire.begin(8);                
  Wire.onReceive(receiveEvent);
  Serial.println("Slave Initialized");
}

void receiveEvent(int howMany) {
  while (1 < Wire.available()) {
    char c = Wire.read();
    Serial.print(c);     
  }
  char c = Wire.read();
  Serial.println(c);     
}

I2C wire chat

From: earl@microcontrollerelectronics.com

Analog Pin 5 SCL

Analog Pin 4 SDA

Common ground

#include <Wire.h>

#define WireDevice 8

String buffer;

int mode;

void setup() { Serial.begin(9600); }

void loop() {

while (Serial.available()) {

char c = Serial.read();

if (c != '\n') {

if (c == '\r') continue;

buffer += c;

continue;

}

else {

buffer += '\0';

if (buffer[0] == '#') {

if (buffer[1] == 'm') {

if (mode != 'm') {

mode = 'm';

master();

Serial.println("Master mode");

}

if (buffer[1] == 's') {

if (mode != 's') {

mode = 's';

slave();

Serial.println("Slave mode");

}

buffer = "";

continue;

}

if (mode == 'm') {

Wire.beginTransmission(WireDevice);

int i = 0;

while (buffer[i]) { Wire.write(buffer[i]); i +=1; }

Wire.endTransmission();

}

else Serial.println("Invalid Mode");

buffer = "";

}

void master() {

Wire.begin();

Serial.println("Master Initialized");

}

void slave() {

Wire.begin(8);

Wire.onReceive(receiveEvent);

Serial.println("Slave Initialized");

}

void receiveEvent(int howMany) {

while (1 < Wire.available()) {

char c = Wire.read();

Serial.print(c);

}

char c = Wire.read();

Serial.println(c);

}

Setup two Arduinos connected by a length of …

Arduino, I2C, Wire
Leave comment

Jan 22 2016

Arduino as a Network Monitor

By earl in Arduino, Informational

I have set up an Arduino as a Network monitor so I can be silently alerted if a WEB server on the LAN/Internet goes down. In a previous post, here, I show the relay circuit I am using in this sketch to flash a CFL lamp. This sketch also uses the same ENC28J60 module to …

Jan 21 2016

Emergency Phone Call Alert to an Arduino via an Asterisk PBX

By earl in Arduino, Circuits, Informational

Recently, I created this simple circuit (and corresponding code) which makes an emergency phone call alert to an Arduino via an Asterisk PBX. This project was for someone who needed to be alerted (silently) if someone made an emergency phone call on their Asterisk PBX. By the way, the free and open source Asterisk PBX …

Nov 16 2015

Controlling and Monitoring an Arduino Galileo via Node.js

By earl in Android, Arduino, Informational

It is very handy to be able to control and monitor things with an Arduino. It is even more handy when you can control and monitor things remotely from wherever you are via the Internet. For arguments sake, lets say we want to both control specific devices we have attached to our Arduino and we …

Nov 16 2015

PCDuino Lite – An Arduino with more Power and Flexibility!

By earl in Arduino

For certain Arduino like projects, you might need more CPU power or the flexibility of running Linux ‘on board’. Besides the Arduino Galileo you might consider another device outside the Arduino family, something like the PCDuino from LinkSprite. I recently experimented with a PCDuino Lite which has 512 MB DRAM, a 1GHz ARM Cortex A8 …

Oct 20 2015

Automated AP-List Scanner for the ESP8266

By earl in Arduino, Informational

I recently posted about using the nRF24L01 module to scan for channels in the 2.4GHz range. That will let you know what channels are in use, however, since the nRF24L01 does not have the embedded network stack, we can’t determine other things like what the ESP8266 module can. (Have you checked out the Espressif.com ESP8266 …

Category: Arduino