take your Arduino skills to the next level by using libraries. this describes a follow-up workshop for people who have already done the Arduino introduction workshop

1. standard Arduino workshop 2017
Hands-on Arduino: the next step
Tom Tobback
www.cassiopeia.hk
2018

2. standard Arduino workshop 2017
some of Tom’s projects
cassiopeia.hk/category/projects/

3. standard Arduino workshop 2017
Before we start… check the connection between your
Arduino board and your laptop:
● plugin your Arduino board USB cable into your laptop
● open Arduino IDE software (www.arduino.cc)
● open the Blink sketch from File>Examples>Basic
● pick the correct port from Tools>Serial Port
● pick the correct board type from Tools>Board “Uno”
● hit ‘upload’ to test the connection
● look for ‘Done uploading’ and check if the onboard LED
is blinking

4. standard Arduino workshop 2017
Introduction project

5. standard Arduino workshop 2017
Introduction project
COMMANDS
pinMode(13, OUTPUT);
digitalWrite(13, HIGH);
digitalWrite(13, LOW);
delay(1000);
pot_value = analogRead(A0);
tone(3, 1000);
noTone(3);
Serial.begin();
Serial.println(pot_value);
STRUCTURE
int pot_value;
void setup() {
}
void loop() {
}

6. standard Arduino workshop 2017
Warm-up: Servo
Using libraries: Servo
File > Examples > Servo > Sweep
#include <Servo.h>
Servo myservo;
myservo.attach(9);
myservo.write(90);

7. standard Arduino workshop 2017
Warm-up: Servo
File > Examples > Servo > Knob
potpin = A0

8. standard Arduino workshop 2017
Next step project
Using libraries:
LCD screen
DHT sensor

9. standard Arduino workshop 2017
Next step project

10. standard Arduino workshop 2017

11. standard Arduino workshop 2017
Arduino pin map ‘pinout’
GPIO: general purpose input/output
ADC: analog input
PWM: pulse width modulation
RX/TX: serial
SDA/SCL: I2C
MISO/MOSI/SCK: SPI
INT: interrupt
AREF: analog reference
Vin: input voltage
RESET

12. standard Arduino workshop 2017
Breadboard = connections

13. standard Arduino workshop 2017
Breadboard power rails
5V to red line
GND to blue line
Optional:
connect to other side

14. standard Arduino workshop 2017
Arduino libraries
Some common libraries
are already included in
the IDE
Other libraries have to
be added as you need
them:
● library manager
● add .zip file
● add manually in
library folder

15. standard Arduino workshop 2017
LCD library: LiquidCrystal
Already included in the IDE
Each library comes with examples: a good starting point
Go to File > Examples > LiquidCrystal > HelloWorld

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LCD wiring
Find the wiring details in the comments
or google ‘arduino lcd’ for images

17. standard Arduino workshop 2017
LCD coding
lcd.begin(16,2);
lcd.clear();
lcd.setCursor(4,0);
lcd.print(“hello DSL”);

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DHT sensor
Temperature and Humidity sensor (not very accurate)
Vcc = 5V
Data
GND
One digital pin for data transfer (specific digital protocol)

19. standard Arduino workshop 2017
DHT library
Not included in IDE, need to add
Go to: Sketch > Include Library > Manage Libraries..
Search for ‘DHT’ and install the Adafruit library
in browser, search for ‘github adafruit unified sensor’
https://github.com/adafruit/Adafruit_Sensor
‘clone or download’ download ZIP
Go to: Sketch > Include Library >
Add .ZIP library

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DHT library
File > Examples > DHT sensor library > DHTtester
DHTPIN 6
DHTTYPE DHT11
Upload
Open Serial Monitor

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LCD + DHT sketch
Copy lines from DHT sketch into LCD sketch
in loop:
Read DHT sensor
Display temp and humidity on the LCD
Wait 2 seconds

22. standard Arduino workshop 2017
Add buzzer for temp alarm
in loop:
Read DHT sensor
Display temp and humidity on the LCD
If temp > 30deg: buzzer beeps
Wait 2 seconds

23. standard Arduino workshop 2017
Add pot for temp alarm
in loop:
Read DHT sensor
Read temp alarm pot
Display temp, alarm, hum on the LCD
If temp > alarm: buzzer beeps
Wait 2 seconds

24. standard Arduino workshop 2017
Add button for hum alarm
in loop:
Read DHT sensor
If button pressed: read hum alarm
else: read temp alarm
Display temp, hum, alarms on the LCD
If temp > alarm OR hum > alarm:
buzzer beeps
Wait 2 seconds

25. standard Arduino workshop 2017
Use timestamp instead of delay
in loop:
If button pressed: read hum alarm
else: read temp alarm
Display temp, hum, alarms on the LCD
If temp > alarm OR hum > alarm:
buzzer beeps
If 2 seconds passed:
read DHT sensor

26. standard Arduino workshop 2017
Use timestamp
unsigned long timestamp = 0;
void loop() {
[code here is executed every loop]
if (millis() - timestamp > 2000) {
[code here only every 2 seconds]
read sensor
timestamp = millis();
}
}

27. standard Arduino workshop 2017
Arduino: suppliers
ONLINE
➔ Official Arduino shop: http://arduino.cc/
great documentation, projects, forum
➔ Seeedstudio: http://www.seeedstudio.com/depot/
➔ Telesky: https://telesky.world.tmall.com/
➔ Adafruit: http://www.adafruit.com/ great documentation
IN HONG KONG - Apliu St
➔ WECL http://www.weclonline.com/wecl_eng/index.html
➔ Tell How http://tellhow-tech.com/

28. standard Arduino workshop 2017
Dimsum Labs
the hackerspace of HK www.dimsumlabs.com/
community of technology enthusiasts
space for creativity in Sheung Wan
Tuesday evening HackJam
www.facebook.com/groups/hackjamhk/

29. standard Arduino workshop 2017
Thank you
www.cassiopeia.hk
Happy tinkering!