A I2C controlled, LCD enabled Thermometer
Aus DL8RDS Wiki
Version vom 3. November 2009, 02:08 Uhr von Dl8rds (Diskussion | Beiträge)
Here's a demonstration of a very tiny Arduino project: It's a microcontroller driven very precise digital thermometer.
Inhaltsverzeichnis
1 Ingredients =
- Arduino Mini Pro
- JHD 162A LCD display
- SE95 I2C temperature sensor on a board from Horter & Kalb http://www.horter.de/i2c/index.htm
- 25 kiloOhm Poti
- 1 kiloOhm Poti
- Breadboard
- 3x AA Alkaline cell
Costs:
- Arduino Mini Pro 15€
- JHD 162A LCD display 10€
- SE95 I2C temperature sensor on a board from Horter & Kalb http://www.horter.de/i2c/index.htm 5€
- 25 kiloOhm Poti 0.25 €
- 1 kiloOhm Poti 0.25 €
- Breadboard + jumper cables 10 €
- 3x AA Alkaline cell 2 €
Overall costs: 42.50€
Surely not a very competitive price. But the brain value was immense!
2 Program
Here's the sketch:
#include <Wire.h> #define tmpaddress 0x48 void setup() { Wire.begin(); Serial.begin(1200); } void loop() { // get the temperature Wire.beginTransmission(tmpaddress); Wire.send(0x00); Wire.requestFrom(tmpaddress, 1); int temperature = 0; if (Wire.available()) { temperature = Wire.receive(); } Wire.endTransmission(); Serial.println("-----------"); Serial.println(temperature-3); delay(1000); }
3 Tests
- battery voltage: 4,79 V
- current: 17 mA
- power consumption: 81 mW