[Renzo Mischianti]

Hi Joppnl,
I tested the connection with this sketch

#include "Arduino.h"
#include "PCF8574.h"
#define SDA D2 // D2=GPIO4
#define SCL D3 // D3=GPIO0

// Set i2c address
PCF8574 pcf8574(0x38, SDA, SCL);

void setup()
{
	Serial.begin(115200);

	// Set pinMode to OUTPUT
	pcf8574.pinMode(P0, INPUT);
	pcf8574.pinMode(P1, INPUT_PULLUP);

	pcf8574.pinMode(P5, OUTPUT);
	pcf8574.pinMode(P6, OUTPUT, LOW);
	pcf8574.pinMode(P7, OUTPUT);

	pcf8574.begin();
}

bool startVal = HIGH;

void loop()
{
//	pcf8574.digitalWrite(P0, HIGH);
//	delay(1000);
//	pcf8574.digitalWrite(P0, LOW);
	byte val = pcf8574.digitalRead(P0);
	Serial.print("PIN 0: ");
	Serial.println(val);
	val = pcf8574.digitalRead(P1);
	Serial.print("PIN 1: ");
	Serial.println(val);

	pcf8574.digitalWrite(P7, startVal);
	if (startVal==HIGH) {
		startVal = LOW;
	}else{
		startVal = HIGH;
	}
	delay(3000);
}

It works correctly without any change.

I think there is an issue with your code. Try to change the define like so:

#define SDA D2 // D2=GPIO4
#define SCL D3 // D3=GPIO0

Bye Renzo

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[Renzo Mischianti]

Hi Joppnl,
other people tell me about that problem, for now, seems that a

  Wire.begin();   

at the beginning of the setup function fix the problem.
But I must investigate.

Bye Renzo

[Renzo Mischianti]

Hi 1n5an1ac,
as you can see in the table attached extracted from the datasheet, the limitation of the 9600 baud rate is applied only when you are programming the device.
The transfer function works correctly.
Bye Renzo

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[Renzo Mischianti]

Thanks to you for helping to find the solution.
Bye Renzo

[Renzo Mischianti]

Hi 1n5an1ac,
Sorry, but I don’t know why but your topic was going on spam.
But I’m happy that you have found the solution.
Bye Renzo

[Renzo Mischianti]

Hi Rodyeo,
I check the 2.0.4 version of CameraWebServer, and I put on working with these changes.
In the main CameraWebServer.ino I add these lines.

const int pwmfreq = 50000;     // 50K pwm frequency
const int pwmresolution = 9;   // duty cycle bit range
ledcSetup(config.ledc_channel, pwmfreq, pwmresolution);  // configure LED PWM channel
ledcAttachPin(4, config.ledc_channel);            // attach the GPIO pin to the channel

after the setting of camera_config_t config; structure

And in the file app_attpd.cpp after the include I add these lines:

//
// LED Illuminator
//
#define CONFIG_LED_ILLUMINATOR_ENABLED
#define CONFIG_LED_LEDC_PIN 4
#define CONFIG_LED_MAX_INTENSITY 255
//#define CONFIG_LED_LEDC_LOW_SPEED_MODE
// CONFIG_LED_LEDC_HIGH_SPEED_MODE is not set
#define CONFIG_LED_LEDC_TIMER LEDC_TIMER_0
#define CONFIG_LED_LEDC_CHANNEL LEDC_CHANNEL_0
// end of LED Illuminator

I have also attached the modified files.

Bye Renzo

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[Renzo Mischianti]

Hi moonman,
connect AUX also (without It, you can’t have real feedback from the device) and enable the DEBUG.

Check also the ampere sent to the device, the 1W module wants 700mAh or more.
Bye Renzo

[Renzo Mischianti]

Hi Celeb10,
I think the transistor isn’t sufficient to control a 12v motor, you need more ampere, try to use a MOSFET.
Bye Renzo

[Renzo Mischianti]

Hi Musti,
to use the repeater mode you must activate the relative flag on the device

        configuration.TRANSMISSION_MODE.enableRepeater = REPEATER_ENABLED;

Then you must use ADDH and ADDL to specify from which NETID to which NETID you want to repeat the signal.

But now I think the schema is more simple to understand.

Bye Renzo

[Renzo Mischianti]

Hi Warleysr,
I don’t know because you have this behavior.
Try to remove completely the resistor.
Bye Renzo

[Renzo Mischianti]

Hi Neuron,
Have you already seen the relative articles and tutorials?
If not, go here.
Bye Renzo

[Renzo Mischianti]

Ahh!! I forget to add this tip, E22 has a repeater function and can be very useful in a situation like yours.
Bye Renzo

[Renzo Mischianti]

Hi bepaald,
If you select the 5v pin, It absorbs energy directly from the USB, so if the USB has sufficient ampere, It works correctly.

To avoid the obstacles, there are 2 important factors, first power and second the frequency. A small frequency is able to avoid the obstacles better.
But If the structure to avoid is too big, It’s very difficult to have good efficiency.

The PCB is fully compatible, but some LoRa device has a big form factor and can be difficult to put in.
Bye Renzo

[Renzo Mischianti]

Hi Grzegorz,
It’s strange in the framework the default frequency is already 100000
but I think It’s sufficient tu put

Wire.setClock(100000);

before the pcf8574.begin

Bye Renzo

[Renzo Mischianti]

Hi warleysr,
a similar problem also here (resolved with the properly use of library).

Try to add an external power supply and check if M0 and M1 go HIGH correctly.

Bye Renzo

[Author]

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