From dad40306262c444976b0c3769992ba6cd59b9888 Mon Sep 17 00:00:00 2001 From: "Dmitry V. Sokolov" Date: Thu, 20 Feb 2020 23:15:52 +0100 Subject: Update README.md --- README.md | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/README.md b/README.md index 5a1b891..1fdbeba 100644 --- a/README.md +++ b/README.md @@ -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. -- cgit v1.2.3