Touch sensor using BC547 | Transistor projects | Bluebrain Robotics | Electronics projects

Welcome to Bluebrain Robotics, where we explore the fascinating world of robotics!
In this project, you will build a touch sensor circuit. It’s a cool and simple circuit that allows you to control an LED with the touch of a finger. And you only need three components, how cool right?
You can build this circuit if you’re a total beginner.
For more details:
www.bluebrainrrc.com
[phone]
Components Needed:
9V Battery
9V Battery Clip
Breadboard
Jumper Wires
470Ω Resistor
LED
NPN Transistor (BC546/547/548 or similar)
Step 1: Connect The Transistor
Start by connecting the transistor a little bit down on the board.
If you’re using a BC546/BC547/BC548 transistor, you can connect it as shown in the figure.
Step 2: Connect The Resistor
Step 3: Place The LED And Touchpad
Now, you’re going to connect the LED and the touch-sensing part. For the touch-sensing part, you’ll need two exposed wires. You can get this from the LED. The LED has much longer legs than needed.
Cut off the legs of the LED so that only around 1 cm / 0.4 in is left on the LED. Bend the two legs that you just cut off, as shown below, so that they fit in between four columns on a row.
Step 4: Connect The Touchpad
Now you need to connect the two touch wires to the correct points in the circuit, using jumper wires.
Step 5: Touch It!
Next, connect a jumper wire from row 1 column J to the positive supply column on the right. Then connect a jumper wire from row 12 column I to the negative supply column on the right.
If everything is connected properly, nothing should happen right now.
But then, try to touch the touch wires so that your finger touches both wires at the same time, and the light will turn on.
If you can’t see the light, try making the tip of your finger wet before touching again. When the skin of your finger is wet, the resistance decreases so that more current can flow through your finger and to the base of the transistor.
Connect your battery connector and plug in the battery.
What If There Is No Light?
In this circuit there are three common errors:
the orientation of the LED is wrong
the orientation of the transistor is wrong
you are using a PNP transistor instead of an NPN transistor
your finger is too dry
The NPN and the PNP transistors look exactly the same, so the only way to distinguish them is to look at what is written on the transistor. If it says BC557, it’s a PNP transistor, which is not correct. If it says BC546 (or BC547 or BC548) it’s NPN and it’s correct.
If you tried all of the above and it’s still not working, check the resistance value of your resistor. It should be 470 Ω. If it’s much more, it restricts the current to the LED too much. If it’s much less, it might have broken the LED.
If you have any questions about this experiment, use the comment field below.
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