Moto G4 Plus Nougat officially released in India

As promised by motorola to launch its nougat update for Moto G4 Plus, it is officially rolled out in India.

For upgrading to Android 7, Go to Settings-> About Phone-> System Updates  and then click on Yes, I’m In. The file SIZE is of 713 MB and after downloading it asked for installing and the whole procedure after takes 18-20 minutes.
I have already upgraded to Latest Nougat having Build Number NPJ25.93-11 screenshot attached here.






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Turns any laptop into a touchscreen

Ever since Microsoft so heartily embraced finger-friendliness with Windows 8, those people who doesn’t have touchscreen are far away from some features which required touching the screen. So one have to upgrade his/her laptop to use those features which is a costly. So why should one opt this costly method if we have alternative in the market.

Accessory makers have been striving to figure out a compelling way to add touch capabilities to non-touchscreen displays, be it in the form of fancy styli paired with infrared receivers, gesture control scheme like Leap Motion, PreCursor by Pranav Mistry or touch-sensitive overlays that you plop on your laptop’s display. But sadly, every single solution has been either lacking in functionality or just plain overpriced.

Enter Neonode’s AirBar—potentially.

All you need to know about AirBar

Let’s tech out for a while. AirBar projects an invisible light field on the surface of your display that makes it possible to “touch” the screen and interact with Windows® 8 and 10 gestures. This is all thanks to Neonode’s zForce AIR technology, which can be used for all sorts of cool stuff. The reason you can use anything to touch is that the light field reacts to any disturbance. So raise your hand and make sure you’re first in line.

Get ready to pinch, swipe, zoom and scroll without a touchscreen. The AirBar sensor works with your PC, and if you like to touch, this is it.

The Neonode AirBar is a small bar that attaches magnetically to the bottom of your computer’s display. When plugged into an available USB port, it begins emitting invisible light that can be used to track movements and gestures, which are translated into corresponding inputs. Essentially, this bar will turn any computer into a touchscreen, without making any changes to the hardware. And what’s great is that it works whether you’re using your bare finger, gloves, or any other object.


Currently AirBar Matte black finish is available only for 11.6”, 13.3”, 14” and 15.6” screens for $69 only.

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Useful for electronics hobbyists, this linear workbench power supply converts a high input voltage (12V) from the SMPS of a PC into low output voltage (1.25 to 9 volts). An adjustable three-pin voltage regulator chip LM317T (IC1) is used here to provide the required voltages. The LM317T regulator, in TO-220 pack, can handle current of up to 1 amp in practice.

Fig. 1 shows the circuit of the desktop power supply. Regulator IC LM317T is arranged in its standard application. Diode D1 guards against polarity reversal and capacitor C1 is an additional buffer. The green LED (LED1) indicates the status of the power input. Diode D2 prevents the output voltage from rising above the input voltage when a capacitive or inductive load is connected at the output. Similarly, capacitor C3 suppresses any residual ripple.


Connect a standard digital voltmeter in parallel with the output leads to accurately set the desired voltage with the help of variable resistor VR1. You can also use your digital multimeter if the digital voltmeter is not available. Switch on S1 and set the required voltage through preset VR1 and read it on the digital voltmeter. Now the power supply is ready for use.

The circuit can be wired on a common PCB. Refer Fig. 2 for pin configuration of LM317 before   soldering it on the PCB. After fabrication, enclose the circuit in a metallic cover as
shown in Fig. 3. Then open the cabinet of your PC and connect the input line of the gadget to a free (hanging) four-pin drive power connector of the SMPS carefully.

2                                  3

1Wikipedia: Year 1 (I) was a common year starting on Saturday or Sunday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Saturday of the Proleptic Julian calendar.

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Mobile Bug

This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one and- a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying and unauthorized video transmission.

The circuit can detect both the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode. The moment the bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases.

An ordinary RF detector using tuned LC circuits is not suitable for detecting signals in the GHz frequency band used in mobile phones. The transmission frequency of mobile phones ranges from 0.9 to 3 GHz with a wavelength of 3.3 to 10 cm. So a circuit detecting gigahertz signals is required for a mobile bug.

Here the circuit uses a 0.22μF disk capacitor (C3) to capture the RF signals from the mobile phone. The lead length of the capacitor is fixed as 18 mm with a spacing of 8 mm between the leads to get the desired frequency. The disk capacitor along with the leads acts as a small gigahertz loop antenna to collect the RF signals from the mobile phone.

Op-amp IC CA3130 (IC1) is used in the circuit as a current-to-voltage converter with capacitor C3 connected between its inverting and non-inverting inputs. It is a CMOS version using gate-protected p-channel MOSFET transistors in the input to provide very high input impedance, very low input current and very high speed of performance. The output CMOS transistor is capable of swinging the output voltage to within 10 mV of either supply voltage terminal.


Capacitor C3 in conjunction with the lead inductance acts as a transmission line that intercepts the signals from the mobile phone. This capacitor creates a field, stores energy and transfers the stored energy in the form of minute current to the inputs of IC1. This will upset the balanced input of IC1 and convert the current into the corresponding output voltage.

Capacitor C4 along with high-value resistor R1 keeps the non-inverting input stable for easy swing of the output to high state. Resistor R2 provides the discharge path for capacitor C4. Feedback resistor R3 makes the inverting input high when the output becomes high. Capacitor C5 (47pF) is connected across ‘strobe’ (pin 8) and ‘null’ inputs (pin 1) of IC1 for phase compensation and gain control to optimize the frequency response.

When the mobile phone signal is detected by C3, the output of IC1 becomes high and low alternately according to the frequency of the signal as indicated by LED1. This triggers monostable timer IC2 through capacitor C7. Capacitor C6 maintains the base bias of transistor T1 for fast switching action. The low-value timing components R6 and C9 produce very short time delay to avoid audio nuisance.

Assemble the circuit on a general purpose PCB as compact as possible and enclose in a small box like junk mobile case. As mentioned earlier, capacitor C3 should have a lead length of 18 mm with lead spacing of 8 mm. Carefully solder the capacitor in standing position with equal spacing of the leads. The response can be optimized by trimming the lead length of C3 for the desired frequency. You may use a short telescopic type antenna. Use the miniature 12V battery of a remote control and a small buzzer to make the gadget pocket-size. The unit will give the warning indication if someone uses mobile phone within a radius of 1.5 meters.

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Stress Meter

Stress Meter is a device which let us access our emotional pain. With the help of this device one can easily come to know about the stress level of human body. If the stress is very high, it gives visual indication through a Light Emitting Diode(LED) display along with a warning beep. The gadget is small enough too worn around the wrist.

Principle: The gadget is based on the principle that the resistance of the skin varies in accordance with your emotional states. If the stress level is high the skin offers less resistance, and if the body is relaxed the skin resistance is high. The low resistance of the skin due to increase in the blood supply to the skin. This increases the permeability of the skin and hence the conductivity for electric current.

List of Components Used

  • Resistors – 470E(2),1K,47K,560E,1.2K
  • Transistors – BC 548
  • Variable Resistors – 1M, 47K
  • Diode – 1N4148
  • Capacitors -10µ,100µ(2); 16V
  • 9V Battery
  • Zener Diode – 5.1V,0.5W
  • IC – LM3915
  • LED’s
  • Piezo Buzzer
  • ON/OFF Switch

Circuit Diagram



This stress monitor lets you assess your emotional pain. If the stress is very high, it gives visual indication through a light-emitting diode (LED) display along with a warning beep. The gadget is small enough to be worn around the wrist.

The gadget is based on the principle that the resistance of the skin varies in accordance with your emotional states. If the stress level is high the skin offers less resistance, and if the body is relaxed the skin resistance is high. The low resistance of the skin during high stress is due to an increase in the blood supply to the skin. This increases the permeability of the skin and hence the conductivity for electric current.

This property of the skin is used here to measure the stress level. The touch pads of the stress meter sense the voltage variations across the touch pads and convey the same to the circuit.

The circuit is very sensitive and detects even a minute voltage variation across the touch pads.

The circuit comprises signal amplifier and analogue display sections. Voltage variations from the sensing pads are amplified by transistor BC 548(T1), which is configured as a common-emitter amplifier. The base of T1 is connected to one of the touch pads through resistor R1 and to the ground rail through potentiometer VR1. By varying VR1, the sensitivity of T1 can be adjusted to the desired level. Diode D1 maintains proper biasing of T1 and capacitor C1 keeps the voltage from the emitter of T1 steady.

The amplified signal from transistor T1 is given to the input of IC-LM3915 (IC1) through VR2. IC-LM3915 is a monolithic integrated circuit that senses analogue voltage level sat its pin 5 and displays them through LED’s providing a logarithmic analogue display. It can drive up to ten LED’s one by one in the dot/bar mode for each increment of 125mV in the input.

Here, we’ve used only five LED’s connected at pins 14 through 18 of IC1.LED1 glows when input pin 5 of IC1 receives 150 mV. LED5 glows when the voltage rises to 650 mV and LED5 flashes and piezo buzzer PZ1 beeps when the stress level is high.

Resistors R4 and R5 and capacitor C2 form the flashing elements. Resistor R3 maintains the LED current at around 20mA. Capacitor C3 should be placed close to pin3 for proper functioning of the IC. Zener diode ZD1 in series with resistor R6 provides regulated 5V to the circuit.

The circuit can be assembled on a small piece of perforated board. Use transparent 3mm LED’s and a small Piezo buzzer for audio-visual indications. Enclose the circuit in a small plastic case with touch pads on the back side. Two self-locking straps can be used to tie the unit around your wrist.

After tying the unit around your wrist (with touch pads in contact with the skin), slowly vary VR1 until LED1 glows (assuming that you are in relaxed state). Adjust VR2 if the sensitivity of IC1 is very high. The gadget is now ready for use.

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