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November 2010 - Circuit Crush

Month: November 2010

The DS18B20 Digital Thermometer

Dallas Semiconductor (Maxim) produces a line of “One-Wire” devices, that allow multiple sensors to connect to a single data pin on a microcontroller. GND and +5vdc are also needed. I’ve put together a single sensor DS18B20 (soon to be expanded to multiple sensors) displaying the temperature on a LCD display. This example is digital, unlike …

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The $2 Thermistor Temperature Sensor

A thermistor makes for a very inexpensive temperature sensor, under $2 for the thermistor and the 10k ohm resistor, not counting the $45 for the Arduino and LCD display: #include <LiquidCrystal.h>#include <math.h> /*LCD Connections:rs (LCD pin 4) to Arduino pin 12rw (LCD pin 5) to Arduino pin 11enable (LCD pin 6) to Arduino pin 10LCD …

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Thermistors, Ethernet Shields, and More

Yesterday I received a package in the mail from Hacktronics. Call it an early Christmas present. Inside was a package of Thermistors, 10k ohm resistors, a breadboard, and a Ethernet/Micro SD card Shield. Stay tuned for a variety of projects (including web based access to our weather station) based on these devices, and check out …

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