Difference between revisions of "16 LEDs"

Latest revision as of 11:59, 11 November 2015

The 16_LEDs PCB

This is the documentation page for the 16-LEDs board. That you can buy in the BitWizard shop.

Overview

A very useful board to test your digital outputs. Works on 5V as well as 3.3V so for the DIO as well as the Pi GPIO pins.
Must have! Use the 10x1Pin F-F kabel to hook it up to the boards (e.g. i2c_dio or spi_dio). Or if your board has a 10x2 pin header, you can use a 20pin IDC cable.

Assembly instructions

No user adjustable settings.

Possible Configurations

The 16-leds board can be ordered in two versions. The common-anode version will connect all the anodes to VCC (pin 19,20) and the leds via a resistor to the 16 inputs (pin 3-18). This means that the led will light up if you drive the input pin (3-19) LOW. This is useful for open collector outputs. However usually this results in inverted logic: the led lights when the signal is low.

Most people will want the common-cathode version. This connects all the cathodes to GND (pin 1/2) and then all the inputs to the leds. This results in normal logic: the leds light up if the signal is high.

Testing

To test the 16LED, connect the GND (pin 1 or 2) to any of the GND pins on your board.

Next take a 5V (or 3.3V) wire (pin 2 on DIO) and connect it one at a time to pin 3, 4, and so on. You can use a power supply pin or a pin programmed to "high". Each time you touch one of the inputs, one of the leds should light up.

External resources

Related projects

Pinout

pin		function
1	2	GND	GND
3	4	LED0	LED1
5	6	LED2	LED3
7	8	LED4	LED5
9	10	LED6	LED7
11	12	LED8	LED9
13	14	LED10	LED11
15	16	LED12	LED13
17	18	LED14	LED15
19	20	VCC	VCC

Jumper settings

Common Ground/Common VCC is hard wired in JP1.

1=2 3	Common GND / kathode
1 2=3	Common VCC / anode

Future hardware enhancements

The jumper is not much use: If you have the common cathode version the jumper must connect the common rail to GND, and if you have the common anode version, you must connect it to VCC. Therefore it makes more sense to make this a solder-jumper. It makes sense to design the board to have the GND signal the default because most people will want the normal-logic version i.e. the common cathode.

Changelog

2.0

Initial public release

@@ Line 1: / Line 1: @@
 [[File:16-LEDs.jpg|thumb|300px|alt=The 16_LEDs PCB|The 16_LEDs PCB]]
-This is the documentation page for the 16-LEDs board.
+This is the documentation page for the 16-LEDs board. That you can buy in the [http://www.bitwizard.nl/shop/expansion-boards/dio-leds BitWizard shop].
 == Overview ==
-A very useful board to test your digital outputs. Works on 5V as well as 3.3V so for the DIO as well as the Pi GPIO pins.
+A very useful board to test your digital outputs. Works on 5V as well as 3.3V so for the DIO as well as the Pi GPIO pins.<br>
-Must have! Use the 10x1Pin F-F kabel to hook it up to the boards.
+Must have! Use the 10x1Pin F-F kabel to hook it up to the boards (e.g. i2c_dio or spi_dio). Or if your board has a 10x2 pin header, you can use a 20pin IDC cable.
 == Assembly instructions ==
@@ Line 11: / Line 11: @@
 === Possible Configurations ===
-To test the 16LED, connect the device to any of the GND and power pins on the boards.<br>
+The 16-leds board can be ordered in two versions. The common-anode version will connect all the anodes to VCC (pin 19,20) and the leds via a resistor to the 16 inputs (pin 3-18). This means that the led will light up if you drive the input pin (3-19) LOW. This is useful for open collector outputs. However usually this results in inverted logic: the led lights when the signal is low.
-For example if you have a combination of the DIO and the 16LED (common GND), connect DIO-PIN1 to 16LED-PIN1 and DIO-PIN2 to 16LED-<b>PIN3</b> to light LED0 as DIO-PIN2 is VCC (5V).
+Most people will want the common-cathode version. This connects all the cathodes to GND (pin 1/2) and then all the inputs to the leds. This results in normal logic: the leds light up if the signal is high.
+=== Testing ===
+To test the 16LED, connect the GND (pin 1 or 2) to any of the GND pins on your board.
+Next take a 5V (or 3.3V) wire (pin 2 on DIO) and connect it one at a time to pin 3, 4, and so on. You can use a power supply pin or a pin programmed to "high". Each time you touch one of the inputs, one of the leds should light up.
 == External resources ==
@@ Line 26: / Line 34: @@
 | 1 || 2 || GND || GND
 |-
-| 3 || 4 || LED1 || LED2
+| 3 || 4 || LED0 || LED1
 |-
-| 5 || 6 || LED3 || LED4
+| 5 || 6 || LED2 || LED3
 |-
-| 7 || 8 || LED5 || LED6
+| 7 || 8 || LED4 || LED5
 |-
-| 9 || 10 || LED7 || LED8
+| 9 || 10 || LED6 || LED7
 |-
-| 11 || 12 || LED9 || LED10
+| 11 || 12 || LED8 || LED9
 |-
-| 13 || 14 || LED11 || LED12
+| 13 || 14 || LED10 || LED11
 |-
-| 15 || 16 || LED13 || LED14
+| 15 || 16 || LED12 || LED13
 |-
-| 17 || 18 || LED15 || LED16
+| 17 || 18 || LED14 || LED15
 |-
 | 19 || 20 || VCC || VCC
 |}
+== Jumper settings ==
 <b>Common Ground/Common VCC</b> is hard wired in JP1.
 <table>
-<tr><td> 1=2&nbsp;&nbsp;3</td><td>Common GND</td></tr>
+<tr><td> 1=2&nbsp;&nbsp;3</td><td>Common GND / kathode</td></tr>
-<tr><td> 1&nbsp;&nbsp;2=3 </td><td>Common VCC</td></tr>
+<tr><td> 1&nbsp;&nbsp;2=3 </td><td>Common VCC / anode</td></tr>
 </table>
-== Jumper settings ==
 == Future hardware enhancements ==
+The jumper is not much use: If you have the common cathode version the jumper must connect the common rail to GND, and if you have the common anode version, you must connect it to VCC. Therefore it makes more sense to make this a solder-jumper. It makes sense to design the board to have the GND signal the default because most people will want the normal-logic version i.e. the common cathode.
 == Changelog ==