From 43669fb27060de485017cf6258901210a5bee07c Mon Sep 17 00:00:00 2001 From: tmk Date: Mon, 24 Mar 2014 17:01:43 -0700 Subject: Updated FAQ (markdown) --- FAQ.md | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'FAQ.md') diff --git a/FAQ.md b/FAQ.md index 2935d6be68..8df23af92e 100644 --- a/FAQ.md +++ b/FAQ.md @@ -88,3 +88,22 @@ Use `1UL<<16` intead of `1<<16` in `read_cols()` in **matrix.h** when your colum In C `1` means one of **int** type which is **16bit** in case of AVR so you can't shift left more than 15. You will get unexpected zero when you say `1<<16`. You have to use **unsigned long** type with `1UL`. http://deskthority.net/workshop-f7/rebuilding-and-redesigning-a-classic-thinkpad-keyboard-t6181-60.html#p146279 + + + +## Pull-up Resistor +In some case converters needed to have pull-up resistors to work correctly. Place the resistor between VCC and signal line in parallel. + +``` +Keyboard Conveter + ,------. +5V------+------|VCC | + | | | + R | | + | | | +Signal--+------|PD0 | + | | +GND------------|GND | + `------' +R: 1K Ohm resistor +``` \ No newline at end of file -- cgit v1.2.1