DS18S20 Dual Temperature Meter
DS18S20 Dual Temperature Meter



  DS18S20 Dual Temperature Meter Component List:

1x 2x16 LCD with Backlight
1x 16x1 LCD Female Header Connector
1x 16x1 LCD Male Header Connector
1x Programmed PIC16F628
2x DS18S20 1-Wire Digital Temperature Sensor
1x 100nF Capacitor
1x 10K Pot (LCD Contrast)
1x 10K Resistor
2x 1K Resistor
1x 10 Resistor
1x LM7805 Voltage Regulator
1x Tactile Switch (Display Modes)
1x 2-PIN Male Header Connector
1x 4-PIN Male Header Connector

  Technical Specifications:

Temperature Measurement:
-55 to 125°C (-67 to 257°F)
Accuracy: 0.5 °C / 1 °F
Supply Voltage: 7.5 - 15V
Power Consumption: 8mA (when LCD backlight is turned off)


DS18S20 Dual Temperature Meter Schematic

DS18S20 Dual Temperature Meter

 
This is a simple to build DS18S20 dual temperature meter that allows to measure temperature in two different locations at the same time. The meter is built with very few components thanks to the use of PIC16F628 microcontroller and 2x16 character LCD display. It is like a small computer that can be customizable by upgrading its hex firmware.

DS18S20 Dual Temperature Meter

DS18S20 dual temperature meter uses two very exciting DS18S20 digital temperature sensors that come in convenient TO92 package. Unlike regular sensors where temperature readings are passed as varying voltage, DS18S20 passes temperature information in a digital format as data. This brings many new possibilities and enables to pass temperature information over much longer distances just over a two wire cable. With this capability temperature can be measured in different locations at the same time away from the main circuit board. With regular temperature sensors that rely on the voltage cables must be as short as possible because longer wire lengths introduce stray resistance and bring unreliable readings.

DS18S20 Dual Temperature Meter

Another great feature of DS18S20 sensor is that it doesn't require any calibration at all, while providing 100% accuracy out of the box. That means that you just plug it in and there's no need spending time recalibrating temperature readings. This is all due thanks to the nature of sending information in a digital format. In fact DS18S20 is just like a computer connected to the network that has a unique serial number identifier similar to an IP address. Multiple DS18S20 sensors can send information simultaneously, even over the same two wire bus cable. The two wires provide 3-5V voltage supply to the sensors and they are also used to pass data in two different directions. If wires are very long so that voltage on DS18S20 sensors drops below 3V external 5V voltage supply can be used with 1K resistor to power the sensors.

DS18S20 Dual Temperature Meter

Once PIC microcontroller receives temperature information it converts it into both Celsius and Fahrenheit values so that they can be displayed on LCD display. DS18S20 dual temperature meter is capable of measuring temperatures from -55 to 125 °C degrees Celsius (-67 to 257 °F Fahrenheit) with 0.5 °C / 1 °F accuracy. If you just need to measure temperature in one location you may just use one DS18S20 sensor and PIC16F628 microcontroller will use just one sensor.



DS18S20 Dual Temperature Meter Customizations

 

Additionally the way the temperature is displayed on LCD display can be customized by pressing a tactile button. Each selection is saved in non-volatile EEPROM memory so that PIC remembers it even after the voltage supply is disconnected. Requests for different display styles are welcomed and can be upgradeable by simply flashing PIC16F628 microcontroller with a new hex firmware.

We have also plans to release a temperature thermostat controller version in the near future that will turn on/off devices when certain temperatures are reached. Thermostat controller can be used to turn on/off heaters, fans, air conditioning systems, etc.



DS18S20 Dual Temperature Meter PCB Layout

 

DS18S20 Dual Temperature Meter



DS18S20 Dual Temperature Meter Kit

 

DS18S20 Dual Temperature Meter

DS18S20 Dual Temperature Meter is available in a kit version at Electronics-DIY store. Please see the link for more details.






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