![]() ![]() The VO pin is used to control the contrast of the LCD. A low state (0v) stores the data in the instruction register.Īn Enable (E) pin enables the writing of the data to the registers when it is ready. A high state (+3.3v from a Pi GPIO) stores the data in the data register (the text character). A read would cause the 1602 send data to the Pi at +5v, which could damage the Pi.Ī Register Select (RS) pin tells the 1602 where in memory (register) to store the sent data. The 1602 uses a +5v supply while the Pi uses +3.3v on its GPIO pins. Grounding the RW pin is important to prevent potential reading of the data pins by the Pi. We will only write data to the 1602 (not read anything from), so this pin is connected to ground – the low state which is write only. D0 – D3 are not used.Ī Read/Write (RW) pin selects the 1602’s read or write mode. ![]() The 1602 pins we use are represented in the table above. First, 4 high bits are sent followed by 4 low bits to complete the 8 bit character or instruction. Within the Python program, we can send characters and instructions 4 bits at a time. We will configure the 1602 to use only 4 data lines to reduce wiring connections. Each text character and instruction requires 8 bits of data. ![]() These are sent to the Data Lines – D0 through D7. 1) Text characters, and 2) instructions (commands) that configure and tell the 1602 what to do next. To operate the 1602, we must send two types of data. This project will demonstrate how to connect the Raspberry Pi GPIO pins to the 1602 LCD and then configure and display text using Python programming. It can show up to 2 lines of 16 characters. It is inexpensive, relatively easy to setup and program. The LCD 1602 display is ideal for showing limited text. Some projects for the Raspberry Pi require a display to show information or messages. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |