About

A simple thermometer (DS18B20 on 1-Wire) and a display (SSD1306 on SPI) controlled by Arduino.

Hardware

• DS18B20 Programmable Resolution 1-Wire Digital Thermometer
• SSD1306 Display - 0.96inch OLED (B) - connected to 4-wire SPI (default case)

Setup

Install required libraries.

In Arduino IDE (2.3.1) | Sketch | Include Library | Manage Libraries...

For DS18B20 thermometer:

• DallasTemperature 3.9.0 - https://github.com/milesburton/Arduino-Temperature-Control-Library
• OneWire 2.3.7 - https://github.com/PaulStoffregen/OneWire

For SSD1306 display:

• Adafruit SSD1306 - https://github.com/adafruit/Adafruit_SSD1306

Connections

SPI for 4-wire OLED WaveShare 0.96inch (SSD1306)

Arduino UNO R3 has one Serial Peripheral Interface (SPI) controller with predefined pins. In this case CIPO (D12) is not used.

Arduino Pin	Name	Other common names	Description
D10	SS	CS, nCS, CSB, CSN, nSS, STE, SYNC	Chip Select
D11	COPI	MOSI, SIMO, SDO, DO, DOUT, SO, MTSR	Master out, slave in
D12	CIPO	MISO, SOMI, SDI, DI, DIN, SI, MRST	Master in, slave out
D13	SCK	SCLK, CLK	Serial Clock

WaveShare 0.96inch (SSD1306) configured in 4-wire mode.

OLED Pin - signatures on the device	Description in 4-wire mode	Connected with Arduino Pin
VCC	+3.3V/+5V Power input	+5V
GND	Ground	GND
NC	-	Not used
DIN	COPI (MOSI - Master out, slave in)	D11
CLK	SCK (SCLK - Clock input)	D13
CS	CS (Chip select, low active)	D10
D/C	Command signal, low level for command, high level for data	D7
RES	Reset signal, low active	D8

1-Wire for Digital Thermometer (DS18B20)

With 4.7 kΩ resistor between DQ and +5V.

Digital Thermometer Pin	Description	Connected with Arduino Pin
GND	Ground	GND
DQ	Data Input/Output. Open-drain 1-Wire interface pin	D2
VDD	Supply Voltage +3.0V/+5.5V	+5V

References

• SSD1306 data sheet
• DS18B20 data sheet
• WaveShare 0.96inch OLED (B)
• Arduino SPI Functions/Communication
• Arduino & Serial Peripheral Interface (SPI)
• Arduino UNO R3 pinouts
• Arduino UNO R3 data sheet
• Arduino UNO - co to jest?
• Termometry analogowe i cyfrowe