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--- glossary:glossary_c [2021/09/03 10:49] – [CAN related projects from MERG] add link to CBUS JohnFletcher
+++ glossary:glossary_c [2022/06/27 12:23] (current) – Removed scaling so GIF will animate. WhiteCF
@@ Line 24: / Line 24: @@
 ===== CAN or CAN BUS =====
-Refers to Controller Area Network, and is a bus standard designed to allow microcontrollers and devices to communicate with each other. It is a message-based protocol, designed specifically for automotive applications but now also used in other areas including model railroading.  See: [[http://en.wikipedia.org/wiki/CAN_bus|CAN_bus]]
+Refers to Controller Area Network, and is a bus standard designed to allow microcontrollers and devices to communicate with each other. It is a message-based protocol, designed specifically for automotive applications but now also used in other areas including model railroading.  See: [[wp>CAN_bus|CAN_bus]]
 ===== CAN related projects from MERG =====
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 **CANPAN** MERG CBUS Control panel combined switch input and LED driver, 2nd generation Kit.\\
 \\
-For more details see [[:software:start#CBUS |CBUS]]\\
+Public Wiki area for more details: [[public:cbuspublic:start|CBUS]]\\
 ===== Capacitor =====
@@ Line 88: / Line 88: @@
 ===== Charlieplexing =====
-Charlieplexing is a method of multiplexing a few I/O ports out of a microcontroller to control a large number of LEDs. It is common for an I/O port to either provide (source) current or provide a low level (sink) from another source of current applied to an LED, to allow an LED to light.  Occasionally when designing a microprocessor circuit that has LEDs, a designer finds there are more LEDs than available I/O pins to control them.
+This is a method of multiplexing a few I/O pins of a microcontroller to control a large number of LEDs. It uses I/O pins that can be 3 state, either source or sink current or be open circuit (switched as input). LEDs are wired in reversed pairs. The LEDs are driven in a multiplexed way, rapidly by software. Only 1 LED is lit at any given time. 3 pins can drive 6 LEDs, 4 pins drive 12 LEDs, 5 pins drive 20 LEDs... See the MERG Journal [[https://merg.org.uk/merg_journal/download.php?fileid=35|March 2006]] p34 for additional information.
+{{:glossary:charlieplexing_slowed.gif|charlieplex}}
-Charlieplexing differs from the common one-port-controls-one-LED scheme by allowing each port to alternately source current or sink current. Charlieplexing takes advantage of the dual use of the I/O port combined with a special LED configuration. The scheme modulates the I/O ports quickly such that the desired individual LEDs appear on. Depending on how the pin wiring and LEDs are arranged, a smaller number of microprocessor pins can control a much larger number of LEDs.  See the MERG newsletter (now called a Journal) of [[https://merg.org.uk/merg_journal/download.php?fileid=35|March 2006]] pages 34 and 35 on the web site for additional information.
 ===== Circuit =====
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-Conductors are materials that allow electrical current to flow through them. They are the opposite of insulators. Also see [[https://en.wikipedia.org/wiki/Semiconductor|semi-conductor]].
+Conductors are materials that allow electrical current to flow through them. They are the opposite of insulators. Also see [[wp>Semiconductor|semi-conductor]].
@@ Line 188: / Line 186: @@
-Electric current is by definition the flow of electric charge (electron flow) through a wire, device or circuit. The standard unit of electric current is the Ampere (A), which is a measurement of a certain amount of electrons passing a given point in one second.  See also AMP.
+Electric current is by definition the flow of electric charge (electron flow) through a wire, device or circuit. The standard unit of electric current is the Ampere (A), which is a measurement of a certain amount of electrons passing a given point in one second.  See also [[glossary:glossary_a#amps_or_ampere|Amps or Ampere]]