Note: Dec 12, 2014
The new lots of TrH Meter kits will have Red LED displays instead of Yellow. The PCB color could be Green or Red, and one or more components might come preassembled.
TrH Meter a DIY microcontroller-based indoor thermometer plus hygrometer that displays temperature (°F/°C) and relative humidity on 4 seven segment LED displays which adjust their brightness level according to the surrounding illumination. The displays are 1 inch big, emits bright yellow color, and are readable from more than 50 ft away. It consists of a closed loop system that continuously assesses ambient light condition using an inexpensive light-dependent resistor (LDR) and uses that information to adjust the brightness of the display. The DHT11 sensor is used to measure temperature and relative humidity. The microcontroller used in this project is PIC16F688, and it runs at 4 MHz internal clock. A separate display driver chip (MAX7219) is used to control and refresh the display data on the seven segment LEDs. A 3-position slide switch controls power ON/OFF and Fahrenheit (°F) or Celsius (°C) scale select for temperature display. You will receive a preprogrammed PIC16F688 microcontroller in the kit.
Find more details at http://embedded-lab.com/blog/?p=6582
Leo | Dec. 2, 2015
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