Digital thermometer based on DS18B20

This is easy to build a simple digital thermometer with only two parts – microcontroller, temperature sensor and display. Here is one small project that can be put together in less than hour. It is based on PIC16F628A which reads temperature from DS18B20 1-wire digital sensor. Temperature is displayed on four seven segment display which can output temperature values from -55 to 125 degrees. Probably most work that needs to be done here is interfacing the display which cathodes are switched though BC337 transistor keys. The keying is needed to dynamically switch between separate digits. This way less microcontroller pins are required. Source code is ready for download so all you need is to plug pickit3 or other programmer and have temperature output immediately. Continue reading

The Sensational Quozl’s Temperature Sensor!

Do you familiar with the temperature sensor? Have you ever used any temperature sensors in your daily life? Well, Do you know that the temperature sensor is one of the most useful electronic components and it can help us to do many tasks? Believe it or not, you can apply a temperature sensor in these following field: It can be used as a simple weather detector and reports for web pages; It can be used to detect computer power supply’s temperature and sending out warnings; It can be used as a house temperature monitoring system; It can be used as a refrigerator tester; It can be used as fish tank heater verification; It can be used as daylight sensing; It can be used as primitive locking and so on! This Quolz’s temperature sensor is a four-channel temperature meter, where either the temperature data can be in degrees, C or Fahrenheit, F and its output as a continuous data scream over an RS232 serial port. The kit uses a PIC12C509 and up to 4xDS18S20 digital thermometers. By the way, no external… Continue reading