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Step-by-step guide for making a very simple temperature and humidity meter with 7-segment LED displays

Posted on April 5, 2014 by R-B 5 comments

In this blog post, I am providing you step by step instructions to build a very simple temperature and relative humidity meter for indoor use. All you need to build this project are an Arduino Uno or compatible board, a DHT11 sensor, and a MAX7219 based 8-digit serial 7-segment LED display. The temperature is displayed in degree Celsius and relative humidity in percentage.

Temperature and Humidity meter

TrH Meter kits are back in stock at Tindie

Posted on March 10, 2013 by R-B Leave a comment

TrH Meter is a DIY digital room thermometer plus hygrometer that displays temperature and relative humidity on 4 large (1 inch) seven segment LED displays which adjust their brightness level according to the surrounding illumination. 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. An inexpensive DHT11 sensor is used to measure temperature and relative humidity. You can buy a complete TrH Meter kit with a preprogrammed PIC microcontroller for $26.00.

Displaying temperature in degree F

Temperature display in degree C

Humidity is displayed in percentage (P)

Tindie buying link for TrH Meter kit.

Soldering instructions for the TrH Meter kit

Posted on January 3, 2013 by R-B 7 comments

First of all I would like to thank all of those who preordered the TrH Meter kits during the fundraising campaign that we ran on Tindie. It’s because of your support that we successfully launched this project. Please follow the soldering instructions provided below while building the TrH Meter.

TrH Meter project kit

TrH Meter: A DIY indoor thermometer plus hygrometer with adaptive brightness control implemented to 7-segment LED displays

Posted on December 15, 2012 by R-B 11 comments

This project is about building a microcontroller-based digital room thermometer plus hygrometer that displays temperature and relative humidity on 4 large (1 inch) seven segment LED displays which adjust their brightness level according to the surrounding illumination. 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. An inexpensive DHT11 sensor is used to measure temperature and relative humidity. The microcontroller used in this project is PIC16F688, and it runs at 4 MHz clock generated from its internal source. A separate display driver chip (MAX7219) is used to control and refresh the display data on the seven segment LEDs.

TrH Meter: A DIY indoor thermometer plus hygrometer

chipKIT Project 2: Temperature and relative humidity logger

Posted on July 13, 2012 by R-B 8 comments

This project is about building a PC-based temperature and relative humidity logger using the chipKIT Uno32 board and the DHT11 sensor. The project setup requires no additional wires (other than the USB cable) and components; the DHT11 sensor is directly plugged into four I/O pins of the Uno32 board and the project is ready to go. This could be a handy and an easiest way to setup an ambient room monitoring system for a server room. The Uno32 reads the temperature and relative humidity from the DHT11 sensor at preset interval and sends the data to PC through the USB-UART interface. A PC application is developed using the open-source Processing programming platform to log data onto an ASCII file. The PC application also displays the real-time temperature and relative humidity on computer screen.

PC-based logger for temperature and relative humidity

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