LCD Connection for 20A MPPT

Fairlima · May 11, 2019, 12:16pm

Hello, I’ve been seeing through the schematic of the 20A MPPT, with a reference of mail you replied you stated using OLED Olimex, How do I use another type of display for this as OLED isn’t available within reach. And what’s the connection protocol.

martinjaeger · May 11, 2019, 12:44pm

You can basically use any OLED or LCD with SPI, I2C or UART interface, as these are all available in the UEXT connector.

There are lots of mbed libraries for different displays available. Take the interface to the oled as an example to implement your own display interface:

github.com

LibreSolar/charge-controller-firmware/blob/master/src/uext/uext_oled.cpp

/* LibreSolar MPPT charge controller firmware
 * Copyright (c) 2016-2018 Martin Jäger (www.libre.solar)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef UNIT_TEST

#include "config.h"

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You can find the pin names in the firmware in pcb subdirectory.