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-rw-r--r-- | README.md | 6 |
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@@ -95,6 +95,12 @@ Once the sensing unit is okay, try to find a good resistor value for the LEDs to Note that it is important to put a heatshrink around both the LEDs and the phototransistors to cut off parasitic lights. Moreover, with heatshrink it fits neatly into the eyesockets. When soldering the 2n3904, I recommend to solder first the center pin, and only then the side pins, otherwise it is too easy to create hard-to-remove solder bridges. Personally I find these little basterds harder to solder than the microcontroller itself (but I am bad at soldering!). +If you do to not have an oscilloscope, that is okay, you can do it with a couple of debugging LEDs, check the blue LEDs on the following video: + +![](https://raw.githubusercontent.com/ssloy/penny/master/doc/proximity-sensor.gif) + +For a more distant obstacles the LEDs will be less bright. + If you fail to assemble the proximity sensor, or simply dislike it, there are plenty of options: * You can use isf471 instead of the phototransistors and all the 2n3904 circuitry. |