From 18c10943ea4aae33edc78879c2d163050441cd9d Mon Sep 17 00:00:00 2001 From: Erin Call Date: Wed, 21 Jun 2017 09:57:47 -0700 Subject: [PATCH 1/3] A bit more info about pull-up resistors --- guide/README.org | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/guide/README.org b/guide/README.org index ef4b69e..90559c9 100644 --- a/guide/README.org +++ b/guide/README.org @@ -142,7 +142,8 @@ [[teensy-1.jpg]] - Some interesting pull up 10k resistor business here... (TODO add a small diagram and notes) + The two 2.2kΩ (Red Red Red Gold) pull-up resistors ensure the switches give a clear reading when open. + [Read more about pull-up resistors here](https://learn.sparkfun.com/tutorials/pull-up-resistors). [[teensy-2-fuxor-reziztorrs.jpg]] From 05a90f3fee183f70765e9d7d53c0eb7c6d843ffd Mon Sep 17 00:00:00 2001 From: Erin Call Date: Wed, 21 Jun 2017 09:59:58 -0700 Subject: [PATCH 2/3] Use .org link format, not markdown Oops :sweat: --- guide/README.org | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/guide/README.org b/guide/README.org index 90559c9..6c5a97f 100644 --- a/guide/README.org +++ b/guide/README.org @@ -143,7 +143,7 @@ [[teensy-1.jpg]] The two 2.2kΩ (Red Red Red Gold) pull-up resistors ensure the switches give a clear reading when open. - [Read more about pull-up resistors here](https://learn.sparkfun.com/tutorials/pull-up-resistors). + [[https://learn.sparkfun.com/tutorials/pull-up-resistors][Read more about pull-up resistors here]]. [[teensy-2-fuxor-reziztorrs.jpg]] From 73ac960e79733c631ea4aa8f0ba5d56631e0589b Mon Sep 17 00:00:00 2001 From: Erin Call Date: Sun, 25 Jun 2017 10:38:55 -0700 Subject: [PATCH 3/3] The pullups go to the I/O expander, not switches! --- guide/README.org | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/guide/README.org b/guide/README.org index 6c5a97f..3db7394 100644 --- a/guide/README.org +++ b/guide/README.org @@ -142,7 +142,7 @@ [[teensy-1.jpg]] - The two 2.2kΩ (Red Red Red Gold) pull-up resistors ensure the switches give a clear reading when open. + The two 2.2kΩ (Red Red Red Gold) pull-up resistors ensure a clear signal between the USB controller and the I/O expander. [[https://learn.sparkfun.com/tutorials/pull-up-resistors][Read more about pull-up resistors here]]. [[teensy-2-fuxor-reziztorrs.jpg]]