It Started With a Hardware Limitation I have been using Quectel GNSS modules in my designs for a while. They are reliable, well-documented, and the support ecosystem is solid. But the module I had been using had one problem that I kept running into: no external antenna support . For most projects that is a minor inconvenience. For a marine vessel monitoring and control system , it is a non-starter. A vessel hull blocks sky view, antenna placement is critical, and the difference between a clean fix and no fix at all often comes down to whether you can mount the antenna where it actually has line of sight. An integrated antenna in a sealed enclosure below deck simply does not cut it. So I went directly to Quectel. The Conversation With Quectel I reached out through their official sample request channel. I was not expecting much — most component manufacturers have a standard process: fill out a form, wait, get a few uni...
Long time back i have posted on regarding a voltmeter. I know it took long time to complete it. But this completion is quit modified from my older design. I used an PIC16F88 which has 7 ADC channels .Keke i used only one at the moment. But have many thoughts for an upgrade sometime later. Everyone will think how this fella works. How it works? The circuit was design for two different parts. One is Analog side and other one is Digital side. Analog side does all the voltage conversion part for the micro controller. This was done by an LM358 which is an Operational amplifier, otherwise known as Op-Amp. Huge value of voltage will damage the micro controller. The input voltage for Micro controller should not exceed 5V so this part is handle by the analog circuit. Next is digital part which is the micro controller part which does all computing and display the result. This circuit is complicated for a newbie cause i used shift registers to handle the 7 segment displays. Micro controller outpu...