Projects Demo¶
Breathing LED¶
LED on the TinyProgrammer board will breath in a constant pace.
Here we use DAC pin to output various voltages.
breathing_led.c
int i = 0;
int dir = 1;
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
if (dir)
{
i++;
} else {
i--;
}
if (i >= 255) {
dir = 0;
} else if (i <= 150){
dir = 1;
}
analogWrite(LED_BUILTIN, i);
delay(10);
}
Controlling NeoPixel String¶
You need to first install Adafruit NeoPixel Library.
Adafruit NeoPixel only supports up to 19MHz, but TinyCore uses 20MHz by default, so you can change this file in Adafruit NeoPixel Library. (C:\Users\(username)\Documents\Arduino\libraries\Adafruit_NeoPixel\Adafruit_NeoPixel.cpp)
From
// 16 MHz(ish) AVR --------------------------------------------------------
#elif (F_CPU >= 15400000UL) && (F_CPU <= 19000000L)
To
// 16 MHz(ish) AVR --------------------------------------------------------
#elif (F_CPU >= 15400000UL) && (F_CPU <= 20000000L)
Below is some sample code for using Neopixel library.
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN 12
#define NUM_LEDS 30
#define BRIGHTNESS 50
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRBW + NEO_KHZ800);
byte neopix_gamma[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
void setup() {
// This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
#if defined (__AVR_ATtiny85__)
if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
// End of trinket special code
strip.setBrightness(BRIGHTNESS);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop() {
// Some example procedures showing how to display to the pixels:
colorWipe(strip.Color(255, 0, 0), 50); // Red
colorWipe(strip.Color(0, 255, 0), 50); // Green
colorWipe(strip.Color(0, 0, 255), 50); // Blue
colorWipe(strip.Color(0, 0, 0, 255), 50); // White
whiteOverRainbow(20,75,5);
pulseWhite(5);
// fullWhite();
// delay(2000);
rainbowFade2White(3,3,1);
}
// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}
void pulseWhite(uint8_t wait) {
for(int j = 0; j < 256 ; j++){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, neopix_gamma[j] ) );
}
delay(wait);
strip.show();
}
for(int j = 255; j >= 0 ; j--){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, neopix_gamma[j] ) );
}
delay(wait);
strip.show();
}
}
void rainbowFade2White(uint8_t wait, int rainbowLoops, int whiteLoops) {
float fadeMax = 100.0;
int fadeVal = 0;
uint32_t wheelVal;
int redVal, greenVal, blueVal;
for(int k = 0 ; k < rainbowLoops ; k ++){
for(int j=0; j<256; j++) { // 5 cycles of all colors on wheel
for(int i=0; i< strip.numPixels(); i++) {
wheelVal = Wheel(((i * 256 / strip.numPixels()) + j) & 255);
redVal = red(wheelVal) * float(fadeVal/fadeMax);
greenVal = green(wheelVal) * float(fadeVal/fadeMax);
blueVal = blue(wheelVal) * float(fadeVal/fadeMax);
strip.setPixelColor( i, strip.Color( redVal, greenVal, blueVal ) );
}
//First loop, fade in!
if(k == 0 && fadeVal < fadeMax-1) {
fadeVal++;
}
//Last loop, fade out!
else if(k == rainbowLoops - 1 && j > 255 - fadeMax ){
fadeVal--;
}
strip.show();
delay(wait);
}
}
delay(500);
for(int k = 0 ; k < whiteLoops ; k ++){
for(int j = 0; j < 256 ; j++){
for(uint16_t i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, neopix_gamma[j] ) );
}
strip.show();
}
delay(2000);
for(int j = 255; j >= 0 ; j--){
for(uint16_t i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, neopix_gamma[j] ) );
}
strip.show();
}
}
delay(500);
}
void whiteOverRainbow(uint8_t wait, uint8_t whiteSpeed, uint8_t whiteLength ) {
if(whiteLength >= strip.numPixels()) whiteLength = strip.numPixels() - 1;
int head = whiteLength - 1;
int tail = 0;
int loops = 3;
int loopNum = 0;
static unsigned long lastTime = 0;
while(true){
for(int j=0; j<256; j++) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
if((i >= tail && i <= head) || (tail > head && i >= tail) || (tail > head && i <= head) ){
strip.setPixelColor(i, strip.Color(0,0,0, 255 ) );
}
else{
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
}
if(millis() - lastTime > whiteSpeed) {
head++;
tail++;
if(head == strip.numPixels()){
loopNum++;
}
lastTime = millis();
}
if(loopNum == loops) return;
head%=strip.numPixels();
tail%=strip.numPixels();
strip.show();
delay(wait);
}
}
}
void fullWhite() {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, 255 ) );
}
strip.show();
}
// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256 * 5; j++) { // 5 cycles of all colors on wheel
for(i=0; i< strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
strip.show();
delay(wait);
}
}
void rainbow(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256; j++) {
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel((i+j) & 255));
}
strip.show();
delay(wait);
}
}
// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3,0);
}
if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3,0);
}
WheelPos -= 170;
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0,0);
}
uint8_t red(uint32_t c) {
return (c >> 16);
}
uint8_t green(uint32_t c) {
return (c >> 8);
}
uint8_t blue(uint32_t c) {
return (c);
}
Touch With NeoPixel¶
// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
// released under the GPLv3 license to match the rest of the AdaFruit NeoPixel library
#include "TinyTouch.h"
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define TOUCH_TRIGGER_VALUE 800
TinyTouch touch;
uint8_t touchPins[2] = {13, 2}; //initialize touch pins
// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1
#define PIN 12
// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 30
// When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals.
// Note that for older NeoPixel strips you might need to change the third parameter--see the strandtest
// example for more information on possible values.
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
int delayval = 20; // delay for 20 ms
int rainBowLoop = 0;
void setup() {
touch.begin(touchPins, sizeof(touchPins));
// This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
#if defined (__AVR_ATtiny85__)
if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
// End of trinket special code
pixels.begin(); // This initializes the NeoPixel library.
}
void loop() {
// For a set of NeoPixels the first NeoPixel is 0, second is 1, all the way up to the count of pixels minus one.
touch.touchHandle();
if (touch.getValue(0) > TOUCH_TRIGGER_VALUE && touch.getValue(1) > TOUCH_TRIGGER_VALUE)
{
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(0,150,0));
pixels.show();
}
}
else if (touch.getValue(0) > TOUCH_TRIGGER_VALUE && touch.getValue(1) < TOUCH_TRIGGER_VALUE) {
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(255,0,0));
pixels.show();
}
}
else if (touch.getValue(0) < TOUCH_TRIGGER_VALUE && touch.getValue(1) > TOUCH_TRIGGER_VALUE) {
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(255,255,255));
pixels.show();
}
}
else {
rainBowLoop++;
if (rainBowLoop >= 255) {
rainBowLoop = 0;
}
for(int i=0; i<pixels.numPixels(); i++) {
pixels.setPixelColor(i, Wheel((i+rainBowLoop) & 255));
}
pixels.show();
delay(delayval);
}
}
// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return pixels.Color(255 - WheelPos * 3, 0, WheelPos * 3);
}
if(WheelPos < 170) {
WheelPos -= 85;
return pixels.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
WheelPos -= 170;
return pixels.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}
Servo Control¶
#include <Servo_megaTinyCore.h>
Servo myservo; // create servo object to control a servo
// twelve servo objects can be created on most boards
int pos = 0; // variable to store the servo position
void setup() {
myservo.attach(9); // attaches the servo on pin 9 to the servo object
}
void loop() {
for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
// in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
}
EEPROM¶
#include <EEPROM.h>
void setup() {
float f = 0.00f; //Variable to store data read from EEPROM.
int eeAddress = 0; //EEPROM address to start reading from
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("Read float from EEPROM: ");
//Get the float data from the EEPROM at position 'eeAddress'
EEPROM.get(eeAddress, f);
Serial.println(f, 3); //This may print 'ovf, nan' if the data inside the EEPROM is not a valid float.
/***
As get also returns a reference to 'f', you can use it inline.
E.g: Serial.print( EEPROM.get( eeAddress, f ) );
***/
/***
Get can be used with custom structures too.
I have separated this into an extra function.
***/
secondTest(); //Run the next test.
}
struct MyObject {
float field1;
byte field2;
char name[10];
};
void secondTest() {
int eeAddress = sizeof(float); //Move address to the next byte after float 'f'.
MyObject customVar; //Variable to store custom object read from EEPROM.
EEPROM.get(eeAddress, customVar);
Serial.println("Read custom object from EEPROM: ");
Serial.println(customVar.field1);
Serial.println(customVar.field2);
Serial.println(customVar.name);
}
void loop() {
/* Empty loop */
}
UART Communication with ESP8266¶
#include "Adafruit_EPD.h"
char rec;
char rec_buf[10];
volatile int index = 0;
volatile int flag = 0;
float temp_data = 0;
#define EPD_CS 13
#define EPD_DC 3
#define SRAM_CS 2
#define EPD_RESET 1 // can set to -1 and share with microcontroller Reset!
#define EPD_BUSY 0 // can set to -1 to not use a pin (will wait a fixed delay)
/* Uncomment the following line if you are using 1.54" tricolor EPD */
Adafruit_IL0373 display(152, 152 ,EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
/* Uncomment the following line if you are using 2.15" tricolor EPD */
//Adafruit_IL0373 display(212, 104 ,EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
/* Uncomment the following line if you are using 2.7" tricolor EPD */
//Adafruit_IL91874 display(264, 176 ,EPD_DC, EPD_RESET, EPD_CS, SRAM_CS);
char *buf = "123.45";
void get_weather_data() {
Serial.println("AT+CIPSTART=\"TCP\",\"api.openweathermap.org\",80");
delay(1000);
Serial.println("AT+CIPSEND=113");
delay(500);
while(Serial.available()){
Serial.read();
}
index = 0;
flag = 0;
memset(rec_buf, 0, sizeof(rec_buf));
Serial.print("GET /data/2.5/weather?id=4885955&appid=a9077ed0f95a1800cd2e7752adfdc137 HTTP/1.1");
Serial.write(0x0d);
Serial.write(0x0a);
Serial.println("Host: api.openweathermap.org");
Serial.write(0x0a);
for(int i = 0; i < 1000; i++){
delay(1);
while(Serial.available()){
rec = Serial.read();
if (rec == 't' && flag == 0) {
flag++;
} else if (rec == 'e' && flag == 1) {
flag++;
} else if (rec == 'm' && flag == 2) {
flag++;
} else if (rec == 'p' && flag == 3) {
flag++;
} else if (rec == 0x22 && flag == 4) {
flag++;
} else if (rec == 0x3a && flag == 5) {
flag++;
} else if (flag == 6) {
if (index < 6) {
rec_buf[index++] = rec;
} else {
flag = 0;
}
} else {
flag = 0;
}
}
if (index == 6) {
break;
}
}
delay(1000);
Serial.println("AT+CIPCLOSE");
}
void display_temp(float temp) {
display.clearBuffer();
display.setCursor(2, 0);
display.fillScreen(EPD_WHITE);
display.setTextColor(EPD_BLACK);
display.setTextSize(2);
display.println(" ");
display.println("Current");
display.println("Temperature:");
display.println(" ");
display.setTextSize(4);
display.setTextColor(EPD_RED);
display.print(temp, 1);
display.println(" F");
//refresh the display
display.display();
}
void setup() {
Serial.begin(115200);
display.begin();
delay(10000);
}
void loop() {
get_weather_data();
temp_data = atof(rec_buf);
temp_data = (temp_data - 273.15) * 1.8 + 32;
Serial.println(temp_data,2);
if (temp_data > -100)
{
display_temp(temp_data);
}
delay(600000);
//don't do anything!
}
Interfacing with LCD Display¶
#include <Wire.h>
#include "rgb_lcd.h"
#include "Adafruit_HTU21DF.h"
rgb_lcd lcd;
const int colorR = 255;
const int colorG = 255;
const int colorB = 255;
Adafruit_HTU21DF htu = Adafruit_HTU21DF();
void setup()
{
Serial.begin(9600);
Serial.println("HTU21D-F test");
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
lcd.setRGB(colorR, colorG, colorB);
// Print a message to the LCD.
//lcd.print("hello, world!");
if (!htu.begin()) {
Serial.println("Couldn't find sensor!");
while (1);
}
delay(1000);
}
void loop()
{
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
float temp = htu.readTemperature();
float rel_hum = htu.readHumidity();
lcd.setCursor(0, 0);
lcd.print("Temp=");
lcd.print(temp, 2);
lcd.print(" C");
lcd.setCursor(0, 1);
// print the number of seconds since reset:
lcd.print("Hum=");
lcd.print(rel_hum, 2);
lcd.print(" \%");
Serial.print("Temp: "); Serial.print(temp); Serial.print(" C");
Serial.print(" ");
Serial.print("Humidity: "); Serial.print(rel_hum); Serial.println(" \%");
delay(1000);
}
Interfacing with E-ink Display¶
#include "Adafruit_EPD.h"
#define EPD_CS 13
#define EPD_DC 3
#define SRAM_CS 2
#define EPD_RESET -1 // can set to -1 and share with microcontroller Reset!
#define EPD_BUSY -1 // can set to -1 to not use a pin (will wait a fixed delay)
/* Uncomment the following line if you are using 1.54" tricolor EPD */
Adafruit_IL0373 display(152, 152 ,EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
/* Uncomment the following line if you are using 2.15" tricolor EPD */
//Adafruit_IL0373 display(212, 104 ,EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
/* Uncomment the following line if you are using 2.7" tricolor EPD */
//Adafruit_IL91874 display(264, 176 ,EPD_DC, EPD_RESET, EPD_CS, SRAM_CS);
void setup() {
Serial.begin(9600);
display.begin();
display.clearBuffer();
//draw some pretty lines
for (int16_t i=0; i<display.width(); i+=4) {
display.drawLine(0, 0, i, display.height()-1, EPD_BLACK);
}
for (int16_t i=0; i<display.height(); i+=4) {
display.drawLine(display.width()-1, 0, 0, i, EPD_RED);
}
//refresh the display
display.display();
}
void loop() {
//don't do anything!
}