B4R Question ESP32 / WIFI_KIT_V2 HELTEC with OLED 128/64

skyracer90 · Feb 22, 2021

Hello community,
I still despair with the part. The whole weekend but unsuccessful ...
The board and OLED work via Arduino SDK. Via B4R I just don't get the OLED to light up ... Does anyone have an idea? I've already tried all the examples and pins.

B4X:

Sub Process_Globals
    Public Serial1 As Serial
    Private SSD As AdafruitSSD1306
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    SSD.InitializeHSPI(4, 16, 15)
    'SSD.InitializeI2C(16,0x3c)
    SSD.ClearDisplay
    SSD.GFX.ConfigureText(1, SSD.WHITE, False)
    SSD.GFX.DrawText("Try text")
    SSD.Display
End Sub

Daestrum · Feb 24, 2021

I couldn't get it to work without using the Heltec libraries.

amorosik · Feb 25, 2021

I am also very interested in how this card works with B4R

Mark Read · Feb 25, 2021

Just a thought, according to the link here, you need to register the Lora Gateway. Have you done this?

Regards
Mark

Cableguy · Mar 1, 2021

Mark Read said:
Just a thought, according to the link here, you need to register the Lora Gateway. Have you done this?

Regards
Mark

Heltec produces several ESP32 based boards, some with an LCD, some with LoRA, some with both...
Since the OP only mentioned the LCD issues... I'm guessing it's a ESP32+LCD combo board.

Daestrum · Mar 1, 2021

quick and dirty example using heltec drivers

amorosik · Mar 1, 2021

Daestrum said:
quick and dirty example using heltec drivers

What exactly do you mean by 'Heltec driver'?
When I connect the Heltec module to the usb port, no new peripherals are recognized, and no ComX ports are added
What is necessary to install to 'see' the Heltec module as a ComX port and then be able to load the code from the B4R environment to the Heltec module?

amorosik · Mar 1, 2021

Found
Driver for Heltec WiFi32 module

Daestrum · Mar 1, 2021

Let me check which one I use

Heltec_ESP32_Dev-Boards

skyracer90 · Mar 2, 2021

Thank you Daestrum,
now it's working. Right away with the first B4R project ... Now, thanks to your help, I can get started. Thanks to all..
P.S: Mark Read, it is only the WIFI KIT 32 without "LORA". Thanks anyway..

amorosik · Mar 3, 2021

Yes now first program on Heltec, 'is born'
Oled display can show anything, yeeeaaaaaahhhhhh
And now to drive i/o pins, and to drive pwm outputs how to do?

Cableguy · Mar 3, 2021

amorosik said:
Yes now first program on Heltec, 'is born'
Oled display can show anything, yeeeaaaaaahhhhhh
And now to drive i/o pins, and to drive pwm outputs how to do?

PWM for two pins in ESP32

I try all ways in the forum to make pin 16 and pin 17 as output pwm pin ,but without luck . so if any one can put simple and complete code for this i 'll be grateful to him. THANKS.

www.b4x.com

Just used the Search functionality of the forum...

amorosik · Mar 3, 2021

Cableguy said:
PWM for two pins in ESP32

I try all ways in the forum to make pin 16 and pin 17 as output pwm pin ,but without luck . so if any one can put simple and complete code for this i 'll be grateful to him. THANKS.

www.b4x.com

Thank you very much for the useful information
Now I immediately try to put down some code
But how to understand the physical correspondence of the pins on the module, with the name of the pin to be used on the program?

Cableguy · Mar 3, 2021

For that you need to search for your board's pilot diagram... a simple Google search should do the trick

amorosik · Mar 3, 2021

This is Heltec Wifi Kit 32 pin diagram
On different pins the indication is not unique, for example pin 26 also shows ADC2_9 and DAC1
And therefore, can the same physical pin take on a different number (26, 2_9, 1)?
No dedicated pin as pwm output?

Daestrum · Mar 3, 2021

The pin number is the GPIO number , so pin 26 is GPIO26.
Have a look here on how to use PWM PWM dimming LED

Cableguy · Mar 3, 2021

amorosik said:
This is Heltec Wifi Kit 32 pin diagram
On different pins the indication is not unique, for example pin 26 also shows ADC2_9 and DAC1
And therefore, can the same physical pin take on a different number (26, 2_9, 1)?
No dedicated pin as pwm output?

Almost every pin in ESPxxxxxx boards have multiple functions. In the case you pointed out, you can have it outputting an analog voltage converted from code or have an input digital value read into an analog value.
Each pin must be configured previously as either input or output, wich is done with the D1Pin declaration.
Something like:

B4X:

Dim p As Pin p.Initialize(p.A6,p.MODE_INPUT

When using libs that target specific pins, usually this declaration is done inside the library.

amorosik · Mar 13, 2021

Is it possible to permanently store information on cards of this type, Heltec wifi kit 32?
For example of the calibration values, or similar that must remain stored even in the absence of board voltage

Cableguy · Mar 13, 2021

Please start a new thread as this is a new question. It will help other help you.

B4R Question ESP32 / WIFI_KIT_V2 HELTEC with OLED 128/64

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