Differences

This shows you the differences between two versions of the page.

--- fmlist_scanner:setup_wiring [2025/10/30] – created hayati
+++ fmlist_scanner:setup_wiring [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
+{{indexmenu>.#1| nojs navbar nocookie msort }}
+{{indexmenu_n>400}}
+====== 4. Setup wiring: ATX-buttons, LEDs and Piezo-buzzer on Raspberry ======
+Following notes are only for the Raspberry Pi 3B/3B+/4B **NOT** for other models!
+===== GPIO pins =====
+The Raspberry Pi has two pin headers that are physically labeled (column //Physical// in following table).
+WiringPi software does number the pins differently (http://wiringpi.com/, column //wPi//).
+The right column with the physical pins 2, 4, 6, .., 40 is lying on the outside of the Raspberry Pi.
+Pin 40 is located nearby the USB jacks. The left column with the odd numbered pins is lying inside of the Raspberry Pi board.
+You can get an overview of all pins with
+<code>
+gpio readall
+</code>
+produces
+<code>
+ +-----+-----+---------+------+---+---Pi 3B+-+---+------+---------+-----+-----+
+ | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
+ +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
+ |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
+ |   2 |   8 |   SDA.1 |   IN | 1 |  3 || 4  |   |      | 5v      |     |     |
+ |   3 |   9 |   SCL.1 |   IN | 1 |  5 || 6  |   |      | 0v      |     |     |
+ |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 0 | IN   | TxD     | 15  | 14  |
+ |     |     |      0v |      |   |  9 || 10 | 1 | IN   | RxD     | 16  | 15  |
+ |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | OUT  | GPIO. 1 | 1   | 18  |
+ |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
+ |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
+ |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
+ |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     |
+ |   9 |  13 |    MISO |   IN | 0 | 21 || 22 | 1 | IN   | GPIO. 6 | 6   | 25  |
+ |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   |
+ |     |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   |
+ |   0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   |
+ |   5 |  21 | GPIO.21 |   IN | 1 | 29 || 30 |   |      | 0v      |     |     |
+ |   6 |  22 | GPIO.22 |   IN | 1 | 31 || 32 | 1 | OUT  | GPIO.26 | 26  | 12  |
+ |  13 |  23 | GPIO.23 |   IN | 0 | 33 || 34 |   |      | 0v      |     |     |
+ |  19 |  24 | GPIO.24 |   IN | 0 | 35 || 36 | 0 | OUT  | GPIO.27 | 27  | 16  |
+ |  26 |  25 | GPIO.25 |   IN | 0 | 37 || 38 | 0 | IN   | GPIO.28 | 28  | 20  |
+ |     |     |      0v |      |   | 39 || 40 | 1 | IN   | GPIO.29 | 29  | 21  |
+ +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
+ | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
+ +-----+-----+---------+------+---+---Pi 3B+-+---+------+---------+-----+-----+
+</code>
+===== Connection of CPU fan =====
+The connection may differ depending on the model. Therefore observe the manufacturer's information!
+===== Connection of Piezo-buzzer =====
+The buzzer is connected to the physical pins ''12 (+)'' and ''14 (ground / GND)''. \\
+Test with
+<code>
+gpio mode 1 pwm      # physical pin 12 corresponds to pin 1 in wiringPi
+gpio pwmTone 1 2000  # sound on
+gpio pwmTone 1 0     # sound off
+</code>
+===== Connection of ATX buttons and LEDs =====
+The ATX button for shutdown is connected to the physical pins 39 and 40. \\
+Test with
+<code>
+sudo systemctl stop gpio-input    # 1st, deactivate the service
+gpio mode 29 up                   # physical pin 40 corresponds to pin 29 in wiringPi
+gpio read 29                      # should deliver 1 if the button is not pressed
+                                  # should deliver 0 when the button is pressed
+</code>
+The green LED is connected to physical pin 36 (wiringPi: 27), the ground to pin 34. \\
+The red LED is connected to physical pin 32 (wiringPi: 26), the ground to pin 30. \\
+Test with
+<code>
+gpio mode 27 output  # wiringPi: 27 for green, 26 for red
+gpio write 27 on     # corresponding LED (here: green) enlightens
+gpio write 27 off    # corresponding LED gets dark
+</code>
+**ATTENTION**: the pin assignment of LEDs and buttons has been changed a few times - since the first scanner setup. Changes were necessary, e.g. depending on ATX cable pair and for special Raspberry Pi housings, e.g. the NesPi.
+Reactivate the service after testing the buttons
+<code>
+sudo systemctl start gpio-input
+</code>