hello experts,PCF8575_library
trying from last 2 days for just simple code
my code
#include "Arduino.h"
#include "PCF8575.h"
PCF8575 pcf8575(0x20);
void setup() {
Serial.begin(9600);
Serial.println("PCF8575");
pcf8575.begin();
pcf8575.pinMode(P6, OUTPUT);
}
void loop() {
Serial.println("HIGH");
pcf8575.digitalWrite(P6, HIGH);
delay(1000);
Serial.println("LOW");
pcf8575.digitalWrite(P6, LOW);
delay(1000);
}
please help
sachenwadekar:
please help
Help us help.
Post the simple code that doesn't work.
Draw and post, or find and copy here, the schematic showing how you have hooked up the PCF8575.
Are you using a library? Did that come with examples?
You may also get some mileage out of this
beta version, simulated PCF8575
which uses the wokwi simulator.
a7
not understand what u says
jim-p
August 4, 2023, 6:03pm
4
@sachenwadekar
So you need to connect your LED Cathode to the PCF8575 pin, connect the LED Anode to a 330 ohm resistor and connect the other end of the resistor o 5V
Run the I2C scanner to determine if everything is operating correctly. If you do not get a 0X20 as a valid port it will never work. Change that to the port number returned by the scanner. I have some boards that look like the one you have, they do NOT have pull up resistors. They need to be there, something n the 4.7K range should work fine.
tried, not getting OK.
jim-p
August 5, 2023, 3:03pm
8
GND is the brown wire that you show in the picture in post #1
you are correct.
checked I2C address as below
PCF8574
PCF8575
may be faulty item or anything else ?
that brown wire is for module, i think so
i am sorry, but will you please make complete sketch
its done....
the board which i brought, was un-soldered
and
thanx jim-p....
will u please tell me the same connection for btns ?
system
February 2, 2024, 6:37am
14
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