Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1461
| Posted: 10:43am 14 Nov 2022 |
I make it
it uses a standard 20x4 LCD, maybe with I2C or without
and a nano. a small bit of code loaded into the nano make it
take serial data and put it onto the LCD.
I do this since I've had a lot of problems with driving I2C LCDs
directly, there is far too much EMI and the very lightly buffered
I2C pins of the nano get upset easily, causing the chip to lockup
The serial LCD thing presents 3 wires to the outside world.
ground, 5V and data_in. Data_in is well buffered due to the
arduino code using it as software serial. It seems far more reliable
in the very noisy environment of inverters and mppt controllers.
I just wire up the nano to the LCD, in the case of that pictured below
it's non I2C, so I drive the 4 data pins, 2 control lines, 5V and ground
direct from the nano. Then I have Gnd,5V and D4 on the nano coming out
to be connected to the inverter or mppt.
My inverter and mppt code uses a simple protocol.
I send "$" to set the cursor at the beginning (0,0)
and any other character is printed at the cursor position, moving it to the next location.
load one of these into the nano..
nano_serial_to_parallel_LCD_2.ino.zip
nano_serial_to_i2c_LCD.ino.zip
Edited 2022-11-14 20:44 by poida