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Category Archives: Tips and Tricks

Reviewing Dorji’s DSTH01 digital temperature and humidity sensor module

Posted on December 7, 2013 by R-B Leave a comment

A couple weeks ago I received some sample products from Dorji Applied Technologies, a china-based company that make varieties of RF and sensor modules. One of the products I received was their latest DSTH01 sensor module that carries Silicon Labs’ Si7005 digital relative humidity and temperature sensor on board. Things I liked about it are it is inexpensive (available on Tindie for only $6), compact, and most importantly it supports I2C host interface for communication.

Special hearing aid for high frequency hearing loss

Posted on December 5, 2013 by R-B Leave a comment

A person suffered from high-frequency hearing loss has reduced ability to hear high frequency sounds. This has direct impact on his/her ability to understand speech because most of the commonly used consonants like s, h, and f, are spoken with high pitches. Other examples of high frequency sound are a woman’s or a child’s voice. Studies have shown that by simply amplifying the high frequency notes through a hearing aid does not help too much. Latest hearing aid technologies use a technique called frequency lowering where the high frequency notes are captured, processed, and delivered to the person in lower

Four channel IR relay control board using PIC12F675

Posted on October 3, 2013 by R-B 4 comments

A couple years ago I posted a very simple IR remote control switch for an electrical appliance, that can be turned on and off through any TV remote. Here’s a more advanced one that offers four relay switch control through NEC IR protocol using PIC12F675 microcontroller.

AC load dimmer using triac

Posted on September 24, 2013 by R-B Leave a comment

Triacs-based dimmers are based on the principle of controlling the phase of AC voltage applied to the load and are specially designed for resistive loads such as incandescent or halogen lamps. Mike from Electronics-Lab has shared this simple TRIAC AC load dimmer circuit that can handle AC power up to 400VA. The circuit is working by controlling the phase of the 220 VAC voltage allowing the load to be powered for less than 360º of the full sine wave. Powering the load for smaller period than full sine wave delivers less power, so it has a dimming effect on the

Proximity sensing for mobile phones SAR requirements

Posted on September 21, 2013 by R-B Leave a comment

Research in to the long term health effects from exposure to radio frequency energy has been ongoing over the past two decades. As a result of this research the FCC and other telecommunications agencies have adopted limits for safe exposure to radio frequency (RF) energy. These limits are referred to as the Specific Absorption Rate (SAR), which is the measure of the amount of radio frequency energy absorbed by the body when using a mobile phone or other wireless device. The FCC and other agencies require that manufacturers of wireless devices comply with these limits for safe exposure. In order

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