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Project Notes

#585 DS1822 1-Wire Reading

Basic interrogation of a DS1822 using 1-wire protocol and results display on a Nokia 5110 LCD.

Build

Notes

The DS1822 is an economy 1-Wire digital thermometer with a range of -55°C to +125°C, at ±2.0°C Accuracy from -10°C to +85°C.

It comes in TO-92 packaging and may be powered directly (using three pins), or take parasitic power from the data line (using two pins).

DS1822

Basic Operation

The sequence of operations boils down to this:

  • Send a search request on the wire to find a device
  • Get the device address and ensure the family code is as expected
  • Issue conversion command (0x44)
  • Wait for conversion, then read the conversion scratchpad from the device
  • Process the data received

Family Codes

Model Code
DS18S20 0x10
DS18B20 0x28
DS1822 0x22

Construction

Breadboard

Schematic

The Program

The Arduino sketch is found in DS1822.ino. It uses:

  • OneWire library for temperature sensor communication
  • u8glib library for driving a simple display on a Nokia 5110 screen.

The sketch was written to work with the DS1822, but it can also handle DS18S20 and DS18B20 devices.

Credits and References

About LEAP#585 SensorsArduinoLCD
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LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

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