Building wireless sensor applications using Dorji’s DRF5150S and DRF4432S RF modules (Part 1)

Posted on by 10 comments

Dorji Applied Technology is a China-based company that primarily focuses on building different types of RF modules that can be easily incorporated in designing wireless data loggers, sensor network, telemetry and other wireless applications. Their products mostly use RF transceiver chips from ADI, Infineon, and Silicon Labs. Some of their RF modules have an additional preprogrammed microcontroller that allows direct interface of selected analog and digital sensors to the module. This means you don’t need any external MCU or to write codes for these sensors. I have been playing with their DRF5150S and DRF4432S RF modules for past couple weeks

Read more

Intelligent temperature monitoring and control system using AVR microcontroller

Posted on by 13 comments

Controlling temperature has been a prime objective in various applications including refrigerators, air conditioners, air coolers, heaters, industrial temperature conditioning and so on. Temperature controllers vary in their complexities and algorithms. Some of these use simple control techniques like simple on-off control while others use complex Proportional Integral Derivative (PID) or fuzzy logic algorithms. In this project I’m going to discuss about a simple control algorithm and utilize it intelligently unlike analogue controllers. Here are the features of our controller: Audio-visual setup for setting temperature limits. Fault detection and evasive action. Temperature monitoring and display. Audio-visual warning. System status. Settable

Read more

More MAX7219 based serial seven segment LED displays are available now!

Posted on by 4 comments

Due to high demand of the MAX7219 based serial 4-digit seven segment LED displays, I recently ordered more PCBs for this. You can now order a complete kit for $11.99 and an assembled module for $13.99. Both prices include free shipping within the continental United States. The display is based on the MAX7219 driver chip that supports 3-wire SPI interface. You can find an interfacing example for PIC12F683 microcontroller here. The example code is written in C and therefore, it can be easily implemented to any other microcontroller family. This display module is available for purchase as a kit. The

Read more

chipKIT Project 2: Temperature and relative humidity logger

Posted on by 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

Read more

Add a reminder to your washer

Posted on by Leave a comment

Most washers don’t have a built-in reminder. Mine doesn’t have either and a lot of time I have forgot my clothes inside it after they are done. The wet clothes smell really bad if they are left inside the washer for a while. If you have a similar issue with your washer, you might want to build this project which adds an audible reminder to the washer that will beep when the clothes are done. This project is based on an accelerometer that continuously senses the vibration of the washer when it is running. When the clothes are done, the washer stops

Read more
« Older Entries Recent Entries »