Connecting up the Buttons and LCD Module

Raspberry Pi 3 b+ Pinouts
HD44780 4×20 LCD Parallel Interface Pinouts
RPI Pin Description TalKKonnect
1 3.3 VDC Power NC
3 GPIO2 SDA1 (I2C) Online LED
5 GPIO3 SCL 1(I2C) Participant LED
7 GPIO4 GPCLK0 Transmit LED
9 Ground ┬áTo 2.2K Resistor –> Pin 3 LCD Module
11 GPIO17 (GPIO_GEN0) NC
13 GPIO27 (GPIO_GEN2) NC
15 GPIO22 (GPIO_GEN3) NC
17 3.3 VDC Power NC
19 GPIO10 (SPI_MOSI) NC
21 GPIO09 (SPI_MISO) NC
23 GPIO11 (SPI_CLK) NC
25 Ground NC
27 ID_SD (I2C EEPROM) NC
29 GPIO05 NC
31 GPIO06 NC
33 GPIO13 CH DOWN Button
35 GPIO19 CH UP Button
37 GPIO26 TX Button
39 Ground Ground for Buttons
RPI Pin Description TalKKonnect
2 5 VCD Power LCD Back Light
4 5 VCD Power Pin 2,15 LCD MODULE
6 Ground Pin 5 LCD MODULE
8 GPIO14 (TXD0) NC
10 GPIO15 (RXD0) NC
12 GPIO18 (GPIO_GEN1) Pin 14 LCD MODULE (D7)
14 Ground NC
16 GPIO 23 (GPIO_GEN4) Pin 13 LCD MODULE (D6)
18 GPIO 24 (GPIO_GEN5) Pin 12 LCD MODULE (D5)
20 Ground NC
22 GPIO 25(GPIO_GEN6) Pin 11 LCD MODULE (D4)
24 GPIO08 (SPI_CEO_N) Pin 6 LCD MODULE (EN)
26 GPIO07 (SPI_CE1_N) Pin 4 LCD MODULE (RS)
28 ID_SC(I2C ID EEPROM) NC
30 Ground Pin 1 LCD MODULE
32 GPIO12 NC
34 Ground Pin 16 LCD MODULE
36 GPIO16 NC
38 GPIO20 NC
40 GPIO21 NC

 

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