In this article I have explained how to interface air quality sensor MQ-135 with Arduino. We will see overview of the sensor and construct a project which detects LPG gas leakage and see some relevant readings in serial monitor. What is MQ-135 sensor? MQ-135 is an air quality or air pollution measuring sensor device. It […]
Newly Updated Circuit Projects:
RFID Security Lock Circuit – Full Program Code and Testing Details
In this article we will see how an Arduino based RFID reader circuit could be used for controlling a relay, which in turn could be used in security door lock applications. Overview If you haven’t yet checked the previous RFID article, please go ahead check it out, it covered the basics of RFID technology. We […]
Using TSOP17XX Sensors with Customized Frequencies
The TSOP17XX series ICs are special infrared sensor devices built for responding to specific range of infrared frequencies and convert it into an electrical pulsed output. It thus features a foolproof immunity to other forms of IR signals. Due to this specific center or band-pass operating frequency of a TSOP17XX, it becomes difficult to use […]
Earth Leakage Indicator Circuit for Detecting Current Leakages in Ground Wires
A simple earth leakage indicator circuit discussed here can be used for getting some very useful results regarding current leakages from an appliance body into the earth pin. The idea was requested by Mr. SS kopparthy. The circuit of the proposed earth leakage indicator is shown in the figure below. Each such unit may be […]
AC Phase, Neutral, Earth Fault Indicator Circuit
The circuit explained here will provide LED indications and show if there’s a possible fault in the wiring of your home AC Phase, Neutral, and Earth connections. The idea was requested by Mr. SS kopparthy. Technical Specifications sir, very good morning. I thank you for your help. I further wanted you to consider a circuit […]
Clap Operated Toy Car Circuit
In this post we study how to make a simple clap operated toy car circuit using a clap switch circuit and a MIC amplifier, to control its forward and reverse movements, in response to the claps of the user. The idea was requested by Mr, Zeeshan. This clap operated toy car is will move in […]