The simple programmable humidity sensor circuit I have explained in this article can be used for controlling or maintaining a suitable level of humidity inside a close premise. The circuit could be used in poultry farms or similar areas where humidity level becomes crucial for keeping the animals healthy. The idea was requested by Mr. […]
Controller
5 Simple Water Level Controller Circuits
An automatic water level controller is a device which senses undesired low and high water levels in a tank, and switches a water pump ON or OFF accordingly to maintain an optimal water content in the tank. In this article I have explained 5 simple automatic water level controller circuits which can be used for […]
How to Use IC LM393 as a Current Controller Circuit
In this post we will understand a current controller and current limiter circuit using the IC LM393 comparator. This circuit is using a low power voltage comparator integrated circuit LM393 and one power Metal Oxide Semiconductor Field Effect Transistor, so the idea is simple but the working looks a little deep when we see it […]
SMS Based Pump Controller with Automatic Dry Run Shut Off
In this post I will show how to construct a SMS based water pump controller with automatic shutdown of pump when no water flow through the pump is detected. We will also construct another much simpler automatic dry run preventer circuit without GSM in the next half of the article. What is Dry Run in […]
Hen House Automatic Door Controller Circuit
In this article I have explained an automatic door mechanism circuit that responds to the ambient light conditions by keeping the door open during day time and closed during night. Here the application is used for operating a hen house door. The idea was requested by Mr. Gavin Sweet Technical Specifications I have a project […]
True MPPT Solar Controller Circuit using IC 555
Are you wondering if it was possible to build a very simple MPPT circuit using ordinary parts like IC 555 and IC 741, which would work most efficiently imitating a true MPPT? The answer is yes, it is possible, and we will learn about it details, in the following article. In this design I used […]