Tester from Smartphone

In this article I will tell you how to make a tester from a smartphone for continuity or short circuit interruption of electrical circuits. In fact, I will make a prefix for a cell phone (rather, even an adapter with probes), with which you can make measurements. Its circuit is incredibly simple and contains one resistor.
Tester from a smartphone
Such an article can be useful if you have a working multimeter broken. Or you do not want to take it with you. Personally, I made such an adapter, and threw it into the glove compartment of the car. Now, when I need to ring a light bulb, a fuse, or something else, I pull out the probes and connect to the phone.

What features does the tester use from a smartphone?

Using such a tester, you can:
  • - Call the circuit for an open or short circuit.
  • - Find the approximate value of resistance (0-70 Ohm).
  • - Smartphone produces a sound when the integrity of the circuit is detected.
We need: a connector from the old 3.5 mm jack,under your smartphone, respectively. The resistor is 2.2 kΩ, but if not, you can take another, between 2 and 3 kΩ, though the resistance will not measure so accurately. And the probes are homemade or from a burned tester. And, accordingly, the phone with the ANDROID system.

The adapter-adapter circuit

Pin header pinout. Tester from the smartphone
We will signal from the probes to the microphone input. Tester from Smartphone Everything can be done by mounting by soldering a resistor to a plug, soldering wires and pour hot glue over the whole thing. Either make a separate knot with a bifurcation under the dipstick, put on heat shrinkage and blow out. In extreme cases, use the tape. 15 minutes of work, no more than ...
Tester from smartphone

Application for smartphone

After the adapter is soldered, download the application toGoogle Play(active link on the application) and install it. Run the application and connect the adapter. Everything should work. If you close the probes, you will hear a beep, it means everything is normal and you can use it. Initially zeroes are shown: And when you close the probes between each other, this is the word and the phone beeps.
Tester from Smartphone

Caution when using the tester

This tester can not measure the circuit where there is voltage! Since your smartphone can fail. Also note that in some circuits there may be residual voltage on the capacitors of the device, which will also be dangerous for the smartphone. The thing is sometimes very necessary and in the economy to fit. Smartphones have long entered our life and find more and more greater use.

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