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Electronics For You
June  2019   Issue Vol. 51  No. 6 

MARKET SURVEY
The Changing Test And Measurement Market Of India
5G and vehicle electrification are the major technology trends that will reshape the industry. Customer centricity and continuous innovation will be high on radar of T&M companies

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Hacking Bluetooth Headset to Control a Robot
In this project an old Bluetooth headset can be used, along with a cellphone to make a robot controller, without a microcontroller (MCU) or any programming. Communication between the robot car and the smartphone is done via Bluetooth. This is an excellent hacking project and is easy to build
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Meter to Measure Short Distances
This Arduino-based distance meter can be used for measuring the distance between the sensor and object in the range of 2cm to 400cm using an ultrasonic sensor
 
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Electronic Candle
Electronic or flameless candles are an alternative to traditional wick candles. These are used for home décor and do not carry the risk of fire as these have LEDs that glow instead of an open flame
Download source code
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Active Probe with High Input Impedance and Selectable Gain
A high input impedance AC and DC active probe is required to increase the input resistance and sensitivity of such measuring instruments as oscilloscopes and multimeters. Presented here is one such solution that consists of a single operational amplifier (op-amp) and selectable gain. The active probe protects inputs of the test equipment during testing and experimentation. The probe can easily connect to and disconnect from other equipment
 
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LED Torchlight
Most commercial torchlights use three AA or AAA cells connected in series, which produces 4.5V to drive white LEDs using a current-limiting resistor. These flashlights do not drive the LEDs efficiently due to lack of a current-control circuit. Presented here is a circuit that drives high, bright white LEDs from a single dry cell
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Sharing Wi-Fi Data via Bluetooth
Tethering, or phone-as-modem (PAM), is the process of sharing of a mobile device’s Internet connection with another device, say, a cellphone or computer. Bluetooth tethering is one of the ways of sharing the wireless connection of an Android device with another device using Bluetooth. Say, you are using mobile data, and someone wants to use your data as well but you do not want to disclose the password. What would you do in that case? The answer is Bluetooth tethering, which is available on Android version 2.2 and above
 
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Equipment Controller using MATLAB-Based GUI
In this project, a MATLAB platform to control up to four electrical equipment is presented. Controlling electrical equipment from a remote location using a control panel is employed in many applications. An important application is in a process plant where an operator in a control room, sitting in front of a computer terminal and running a human-machine interface (HMI) application program for process monitoring and controlling, can effectively send hard, real-time control commands/signals to multiple actuators present on the field
Download source code

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