After the initial integration of Arduino to Blinkit project with the first mode (3 Single Colours LED), the second integration of Arduino to the fantastic Blinkit project is here. This to provide added versatility and an added feature to give the possibility to many DIYers and other Hobbyists that have an Arduino board to interact with Steemit and receive notifications such as new upvotes and new followers, etc...
Blinkit is a notification software that can be used to give to regular and widely available devices a Steem purpose.
Blinkit can look for new Steem account Upvotes and Followers, and it can notify on new Posts made by a user.
More devices will be added in the near future.
Blinkit is free and open source, and can be downloaded from the Blinkit Github page:
https://github.com/techtek/Blinkit
For more information about the new version of Blinkit please visit the following link
Current release has been tested only on an Arduino UNO board. Other boards like Mega and Nano should be supported (for Nano different PWM pins should be selected, for Mega nothing to change) but have not been tested yet. Users interested in using this new feature with other boards could submit a test contribution and let us know the result of their test.
Blinkit has been created by 
Behind this second release is the desire to give more and more possibilities of interaction with Blinkit using Arduino boards. In fact now it is possible to have funny and colourful notifications of Steem activities.
Hereafter i will explain the wiring diagram and the code I developed for Arduino and will just show generally how is the interaction with Blinkit software taking place. Full details about Blinkit code for interacting with Arduino can be found in
As the device in question is Arduino this involves the use of C/C++ languages/sub-languages.
Some basic electronics knowledge regarding LED pinout is required. For that purpous I will be posting soon a tutorial on how to determine the pinout of an RGB led and what are the resistors to be used with an Arduino board to keep your LED safe and the Arduino output pins safe.
The code is still devided in 6 parts like the single mode (more details regarding the first mode through this link) option:
char buffer[22];
int RedPIN = 3; //pin for led 1 (single colour led) or pin for the Red led in the RGB led
int GreenPIN = 5; //pin for led 2 (single colour led) or pin for the Green led in the RGB led
int BluePIN = 6 ; //pin for led 3 (single colour led) or pin for the Blue led in the RGB led
//above pins must be DIGITAL PWM PINS (in Arduino Uno, PIN 3, 5, 6, 9, 10, 11 are PWM) in order to obtain the colours shades with the RGB led
int y=0;
int transferdata[3]; //array to be used to store the incoming settings and transfer them to the right setting array
int ledmode[2]; //this array will store the information regarding the ledmode (mode 1 for 3x single colour leds and mode 2 for 1x RGB led )
int blinkdelay[3]; //this array will store the information to be used for the blink speed (in this case it is a delay between blinks)
int Nofblinks[3]; //this array will store the information to be used for the number of triggers/blinks to do (number of repeated triggers)
int BRIGHTU[3]; // This array will store the information regarding the brightness of the RGB led for the upvote trigger (3 values, 1 for for each colour to create the blend with the others)
int BRIGHTF[3];// This array will store the information regarding the brightness of the RGB led for the follower trigger (3 values, 1 for for each colour to create the blend with the others)
int BRIGHTP[3]; // This array will store the information regarding the brightness of the RGB led for the post trigger (3 values, 1 for for each colour to create the blend with the others)
Compared to the Single led mode, what is new in this code are the new arrays BRIGHTU, BRIGHTF and BRIGHTP which will be storing the RGB value of the chosen colour for each notification BRIGHTU for upvotes, BRIGHTF for followers and BRIGHTP for post.
ledmode[], which previously accepted only value "1" for Single colour led mode now accepts also "2" which has been assigned to the RGB mode.
The rest of the variables and arrays have remained the same and have maintained the same function of handling the data received over serial.
void setup()
{
Serial.begin(9600);
Serial.flush();
pinMode(RedPIN, OUTPUT); //set the selected pins as output
pinMode(GreenPIN, OUTPUT);
pinMode(BluePIN, OUTPUT);
}
In this setup I have initialized the serial comunication at a set baudrate (14400) and have set the previously defined pins as output pins. If you want to use a different baudrate just change the value in the sketch to any supported baudrate and don't forget to change the baudrate set for your board accordingly in the device manager (the tutorial for that can be seen through this link along with the tutorial on how to install the driver for Arduino Chinese Clones using CH340 marked chip)
What has changed here compared to the previous version is the name assigned to the variable containing the pin number we used as output which now has been named RedPIN, GreenPIN and BluePIN.
void loop() //collecting the incoming data and filling the buffer with it
{
if (Serial.available() > 0) {
int index=0;
delay(100); // let the buffer fill up
int numChar = Serial.available();
if (numChar>22) {
numChar=22;
}
while (numChar--) {
buffer[index++] = Serial.read();
}
splitdata(buffer);
}
}
In this loop Arduino will listen to the COM port and wait for new data and once new data is detected it will fill the buffer and then redirects the data entered to the next function splitdata(buffer) that will split the that data in order to be processed later in the code. A small adaptation had been made in order to reduce the buffer size from 30 to 22 to get a little back little more free memory(removing some allocated memory to the buffer).
void splitString(char* data) { //splitting the data received based on a fixed separator (in this case the blank space " ")
//Serial.print("Data entered: ");
//Serial.println(data); // display data entered/received
char* info;
info = strtok (data, " "); //using strtok split in tokens the data entered in a sequences of contiguous characters separated by the delimiter " " (empty space)
while (info != NULL) {
setallsettings(info);
setLEDon(info);
info = strtok (NULL, " ");
}
// Clear the text and serial buffers
for (int x=0; x<21; x++) {
buffer[x]='\0';
}
Serial.flush();
}
Hereafter is the main structure of strtok:
char * strtok ( char * str, const char * delimiters );
Once data (str) has been received and once the buffer transfers the data to splitdata(), using strtok we split the data entered in tokens, a sequences of contiguous characters separated by a delimiter (const char * delimiters). In our case we have chosen the delimiter to be an empty space " ".
//here we will store the splitted data received over the serial comunication to store our set-ups
void setallsettings(char* data) {
if (data[0] == 'm') { // select and store in the array lemode the mode ( m1 for 3x single colour led, m2 for 1x RGB led)
int blinkdata = strtol(data+1, NULL, 10);
blinkdata = constrain(blinkdata,1,2);
transferdata[y] = blinkdata;
y=y+1;
if (y==1){ // when transferdata is full of data (we expect 1 data for this setting)
memcpy(ledmode, transferdata, sizeof(transferdata)); //copying transferdata to ledmode then clearing transferdata and resetting y,
for (int i=0; i<=sizeof(transferdata); i++){
transferdata[i]= '\0';
}
y=0;
}
}
if (data[0] == 'n') { //store in an array called Nofblinks the sequence of the number of repeated trigger we want for each led and on which later leds will trigger
int blinkdata = strtol(data+1, NULL, 10);
blinkdata = constrain(blinkdata,1,30);
transferdata[y] = blinkdata;
y=y+1;
if (y==3){ // when transferdata is full of data (we expect 3 values)
memcpy(Nofblinks, transferdata, sizeof(transferdata)); //copying transferdata to Nofblinks then clearing transferdata and resetting y,
for (int i=0; i<=sizeof(transferdata); i++){
transferdata[i]= '\0';
}
y=0;
}
}
if (data[0] == 'd') { //store in an array called blinkdelay the sequence of delays for each trigger
int blinkdata = strtol(data+1, NULL, 10);
blinkdata = constrain(blinkdata,1,1000);
transferdata[y] = blinkdata;
y=y+1;
if (y==3){ // when transferdata is full of data (we expect 3 values)
memcpy(blinkdelay, transferdata, sizeof(transferdata)); //copying transferdata to blinkdelay then clearing transferdata and resetting y,
for (int i=0; i<=sizeof(transferdata); i++){
transferdata[i]= '\0';
}
y=0;
}
}
if (data[0] == 'U') {
int blinkdata = strtol(data+1, NULL, 10);
blinkdata = constrain(blinkdata,0,255);
transferdata[y] = blinkdata;
y=y+1;
if (y==3){ // when transferdata is full of data (we expect 3 values)
memcpy(BRIGHTU, transferdata, sizeof(transferdata)); //copying transferdata to BRIGHTU then clearing transferdata and resetting y,
transferdata[0]= '\0';
y=0;
}
}
if (data[0] == 'F') {
int blinkdata = strtol(data+1, NULL, 10);
blinkdata = constrain(blinkdata,0,255);
transferdata[y] = blinkdata;
y=y+1;
if (y==3){ // when transferdata is full of data (we expect 3 values)
memcpy(BRIGHTF, transferdata, sizeof(transferdata)); //copying transferdata to BRIGHTF then clearing transferdata and resetting y,
transferdata[0]= '\0';
y=0;
}
}
if (data[0] == 'P') {
int blinkdata = strtol(data+1, NULL, 10);
blinkdata = constrain(blinkdata,0,255);
transferdata[y] = blinkdata;
y=y+1;
if (y==3){ // when transferdata is full of data (we expect 3 values)
memcpy(BRIGHTP, transferdata, sizeof(transferdata)); //copying transferdata to BRIGHTP then clearing transferdata and resetting y,
transferdata[0]= '\0';
y=0;
}
}
if (data[0] == '?'){ //send command set to view on serial all the current setups
Serial.println("Current Settings: ");
Serial.println("---------------------------------------------------- ");
Serial.println(" ");
if(ledmode[0]== 1){
Serial.println("ledmode is set to: 3x single colour LED ");
Serial.println(" ");
for (int i=0;i<=2;i++){
Serial.print("Nofblinks for led");
Serial.print(i+1);
Serial.print(" is:");
Serial.print(Nofblinks[i]);
Serial.println(" Blinks");
if (i==2){
Serial.println(" ");
}
}
for (int i=0;i<=2;i++){
Serial.print("blinkdelay for led ");
Serial.print(i+1);
Serial.print(" is:");
Serial.print(blinkdelay[i]);
Serial.println(" Millis");
if (i==2){
Serial.println(" ");
}
}
}
if(ledmode[0]==2){
Serial.println("ledmode is set to: 1x RGB LED ");
Serial.println(" ");
Serial.print("number of blinks for upvote trigger is: ");
Serial.print(Nofblinks[0]);
Serial.println(" Blinks");
Serial.print("number of blinks for follower trigger is: ");
Serial.print(Nofblinks[1]);
Serial.println(" Blinks");
Serial.print("number of blinks for post trigger is: ");
Serial.print(Nofblinks[2]);
Serial.println(" Blinks");
Serial.println(" ");
Serial.print("blinkdelay for upvote trigger is: ");
Serial.print(blinkdelay[0]);
Serial.println(" Millis");
Serial.print("blinkdelay for follower trigger is: ");
Serial.print(blinkdelay[1]);
Serial.println(" Millis");
Serial.print("blinkdelay for post trigger is: ");
Serial.print(blinkdelay[2]);
Serial.println(" Millis");
Serial.println(" ");
Serial.println("RGB value for upvote trigger is set to");
Serial.println(" ");
Serial.print("R= ");
Serial.println(BRIGHTU[0]);
Serial.print("G= ");
Serial.println(BRIGHTU[1]);
Serial.print("B= ");
Serial.println(BRIGHTU[2]);
Serial.println("");
Serial.println("RGB value for follower trigger is set to");
Serial.println(" ");
Serial.print("R= ");
Serial.println(BRIGHTF[0]);
Serial.print("G= ");
Serial.println(BRIGHTF[1]);
Serial.print("B= ");
Serial.println(BRIGHTF[2]);
Serial.println("");
Serial.println("RGB value for post trigger is set to");
Serial.println(" ");
Serial.print("R= ");
Serial.println(BRIGHTP[0]);
Serial.print("G= ");
Serial.println(BRIGHTP[1]);
Serial.print("B= ");
Serial.println(BRIGHTP[2]);
Serial.println("");
}
}
}
After having received the data over serial (step 3 ) and after having split it in tokens (step 4) we will run the loop function setallsettings() who is pointing with the pointer "char* data", to the data splitted in tokens previously. This function will analyze the splitted data based on an initial marker/character and based on it store the data in the right setting array.
The second part in this function which is sending feedbacks over serial has been modified. Now there is no need to type single values like before M or N or D to get specific feedbacks over serial. now by just entering "?" (question mark symbol) Arduino will send back over serial a nice print of the currently stored settings.
void setLEDon(char* data) {
//if i receive the command u from serial (upvote)
if (data[0] == 'u') {
if(ledmode[0]==1){ //and if ledmode[0] is set to 1 (3x single colour led mode)
for (int a= 0; a< Nofblinks[0]; a++){
digitalWrite(RedPIN, HIGH);
delay(blinkdelay[0]);
digitalWrite(RedPIN, 0);
delay(blinkdelay[0]);
}
}
if(ledmode[0]==2){
for (int a= 0; a< Nofblinks[0]; a++){
analogWrite(RedPIN, BRIGHTU[0]);
analogWrite(GreenPIN, BRIGHTU[1]);
analogWrite(BluePIN, BRIGHTU[2]);
delay(blinkdelay[0]);
analogWrite(RedPIN, 0);
analogWrite(GreenPIN, 0);
analogWrite(BluePIN, 0);
delay(blinkdelay[0]);
}
}
Serial.println("you got an upvote ");
Serial.println(" ");
}
//if i receive the command f from serial (follower)
if (data[0] == 'f') {
if(ledmode[0]==1){ //and if ledmode[0] is set to 1 (standard led mode)
for (int a= 0; a< Nofblinks[1]; a++){
digitalWrite(GreenPIN, HIGH);
delay(blinkdelay[1]);
digitalWrite(GreenPIN, 0);
delay(blinkdelay[1]);
}
}
if(ledmode[0]==2){ //and if ledmode[0] is set to 2 (1x RGB led mode)
for (int a= 0; a< Nofblinks[1]; a++){
analogWrite(RedPIN, BRIGHTF[0]);
analogWrite(GreenPIN, BRIGHTF[1]);
analogWrite(BluePIN, BRIGHTF[2]);
delay(blinkdelay[1]);
analogWrite(RedPIN, 0);
analogWrite(GreenPIN, 0);
analogWrite(BluePIN, 0);
delay(blinkdelay[1]);
}
}
Serial.println("you got a new follower ");
Serial.println(" ");
}
if (data[0] == 'p') { //if i receive the command p from serial (new post) and if ledmode[0] is set to 1 (standard led mode)
if(ledmode[0]==1){ //and if ledmode[0] is set to 1 (standard led mode)
for (int a= 0; a< Nofblinks[2]; a++){
digitalWrite(BluePIN, HIGH);
delay(blinkdelay[2]);
digitalWrite(BluePIN, 0);
delay(blinkdelay[2]);
}
}
if(ledmode[0]==2){ //and if ledmode[0] is set to 2 (1x RGB led mode)
for (int a= 0; a< Nofblinks[2]; a++){
analogWrite(RedPIN, BRIGHTP[0]);
analogWrite(GreenPIN, BRIGHTP[1]);
analogWrite(BluePIN, BRIGHTP[2]);
delay(blinkdelay[2]);
analogWrite(RedPIN, 0);
analogWrite(GreenPIN, 0);
analogWrite(BluePIN, 0);
delay(blinkdelay[2]);
}
}
Serial.println("ther is a new post ");
Serial.println(" ");
}
}
As for the previous mode, in this section of the code the function setLEDon() pointing at the data received, will wait till a trigger is detected. In this case it will look at specific characters such as "u" for a new upvote, "f" for a new follower, "p" for a new post and once this triggering character is received the functions will analyze which mode is the chosen one and based on that will trigger accordingly the led (3 leds if in single led mode or 1 rgb led if in RGB mode) based on the initially set settings. If RGB mode is set the RGB led will blink using the RGB value set in the Arrays BRIGHTU, BRIGHTF or BRIGHTP depending on which notification has been received. After finishing each trigger, the function will send back a feedback over serial saying which trigger has been received.
The complete Arduino sketch file (.INO) can be downloaded from my Github repo Blinkit-Arduino-integration
As per previous moderator advice, the previous version of the code and the wiring diagram is available in my github repo.
In order to be able to run Arduino with Blinkit, it is a must (as per the current initial release) to firstly upload the sketch using the official Arduino IDE software. 
Below wiring diagram shows how wiring should be done based on the code selected output pins (in this case the output pins chosen are PIN 3, PIN 5 and PIN 6). Since we are going to also handle RGB leds, pins must be chosen as PWM pins in order to be able to get all the shades and colours of the RGB spectrum. If normal (non PWM pins) are used this could not be possible. Another aspect to take into consideration is that RGB led must be a common cathode (common ground [-]).
int RedPIN = 3; //pin for led 1 (single colour led) or pin for the Red led in the RGB led
int GreenPIN = 5; //pin for led 2 (single colour led) or pin for the Green led in the RGB led
int BluePIN = 6 ; //pin for led 3 (single colour led) or pin for the Blue led in the RGB led
[some other variables are in the code]
void setup()
{
Serial.begin(9600);
Serial.flush();
pinMode(RedPIN, OUTPUT); //set the selected pins as output
pinMode(GreenPIN, OUTPUT);
pinMode(BluePIN, OUTPUT);
}
Below is the interface that will be comunicating with Arduino. This interface came out after a series of testing and implementing codes in Blinkit (in coordination with
With the Arduino board connected to the pc with its data/power cable, once the Arduino form is launched in Blinkit, user must enter his username, chose the COM port on which the Arduino is connected and chose the baudrate.
Then the user must chose the led-mode on which to operate. If Single ledmode is chosen the interface will only show the Number of blinks and the blinkdelay comboboxes in order to select the value for each. If instead RGB mode is chosen the interface will make it visible 3 new comboboxes from which to chose the colour for each of the notifications.
Once all done, hit SAVE Button located under Arduino board image so that the settings gets saved and partially sent to Arduino.
Again after having chosen all the settings through the interface and having clicked on save you are ready to let Blinkit interact with Arduino and let you enjoy colourful notifications using RGB mode. In order to start receiving the notifications you only need to select which notification to look for and press its respective Start Blinkit button
For full details about how the interface works on the code side and how it has been implemented, please get back to
Many updates have been planned concerning Arduino integration. In fact our aim is to let Arduino reach a point where it can become fully automated and do not require to be directly attached to a pc running Blinkit software but will run itself the same tasks as Blinkit software by its own thus becoming a portable stand alone device for Steem related notifications.
Technical support is available, if you may encounter a problem, or if you want to know if your device is supported or will be supported in the near future.
Do you have a question, or suggestion about the integration of Arduino in Blinkit ? Feel free to contact me on Discord (eliaraysalem#0829) or leave a comment below.