This post is about some of the design mistakes which I did in designing my GPS trackers and this mistake is associated with selection for the battery charger chips. I am sharing this so that you will be careful and aware when choosing the battery charger chips for your GSM based applications. 

We designed a new version of the VALTRACK V2 GPS tracker, This version is called VALTRACK-V2B because this will not have internal battery support and this device is specifically made for vehicles. There have been a few modifications and upgrades in the desing, lets look at what they are,

In this post i will show you guys how we can automatically synchronize the RTC of our GSM module with the network time. This method is very useful if we are using a board that doesnt have battery backup present on it. Once the GSM module RTC is synchronized, we can also sync the MCU RTC and also any external RTC if we are using one.

I had been extensively using the MMA8652 accelerometer in my design because of its small size, easy interface and low cost. The accelerometer fits the bill correctly in most of my designs. It has appeared in many of my projects including my VALTRACK-V2 GSM/GPS tracker. But its no longer easily available after the merger of Freescale Semiconductors with NXP Semiconductors. 

In this post we will see why we should select a GNSS module over a GPS only module. There are a lot of Navigation module manufacturers offering GPS and GNSS modules. The GPS modules are always cheaper than the GNSS modules because they support only one satellite constellation and GNSS modules support multiple countries satellite constellations. 

It had been a long time since i wanted to make a building automation system. In fact it was the first product i ever dream't of making. Time passed and i didn't quite find the time and interest to venture into it as i felt that building automation is a old concept and there are too many players doing the same stuff. 

In this post you will find the Arduino MQTT libraries which i used in my tutorial where i showed how to form MQTT packets and also how to send MQTT Publish and Subscribe packets to free MQTT brokers like CloudMQTT, Adafruit.io and Mosquitto.org. Go ahead and download the code and have fun experimenting. 

Hello guys, In this post we will see a list of 3G modules that work with Australian 3G network providers. Unlike other countries, the Australian networks use a slightly different frequency bands, especially Telstra, the leading network provider in Australia. Almost all other carriers, like Optus,,Virgin Mobiles and Vodafone follow standard European frequency bands.

In this post you will see how we built a 3G GPS tracking device or Foaling alarm which can be used for vehicle as well as personal tracking. This is nothing but my same VALTRACK series design with almost the same parts and a few additional features. Due to the 3G module used, the design became a slightly bigger. 

This post is coming out of frustration caused by ZOHO mail. The free mail hosting provider, who also provides paid email hosting plans has limited the free email hosting service access to webmail only, which means, we cant access the mail from outside clients like Microsoft outlook. Earlier i used Zoho mail for accessing one of my domains email since i only had a few users and Zoho mail was the best possible solution at that time.