Search found 6 matches

by Swessels
Tue Jan 16, 2018 8:07 am
Forum: ESP32 boards
Topic: boot failure when connected to powered relay board [Solved]
Replies: 5
Views: 3839

Re: boot failure when connected to powered relay board

- Check the supply voltage with the relay board connected.
- the ESP has 3.3V IO's. Maybe your relay board requires 5V at its inputs.
- the power consumption of the relay board inputs may be to high.

Regards,
Stefan
by Swessels
Wed Jan 03, 2018 5:46 pm
Forum: ESP32 boards
Topic: SSD1306 I2C
Replies: 19
Views: 9207

Re: SSD1306 I2C

deshipu wrote:
Wed Jan 03, 2018 9:22 am
I think you forgot to connect the pullup resistors.
That's correct. For the SPI display it works without them. I know that isn't correct.

Regarding to the I2C - display: as stated in my posts before, with or without pullups, no difference in the behaviour.

Best regards,
Stefan
by Swessels
Tue Jan 02, 2018 7:49 pm
Forum: ESP32 boards
Topic: SSD1306 I2C
Replies: 19
Views: 9207

Re: SSD1306 I2C

If that fails I'd suspect the hardware - you should have better luck with Adafruit's excellent products. Sorry for my late reply, there was no time for the last couple of days. It seems that my I2C display is damaged. A check using an Arduino Leonardo shows no reaction. Using an adafruit 128x32 SPI...
by Swessels
Sun Dec 24, 2017 5:53 am
Forum: ESP32 boards
Topic: SSD1306 I2C
Replies: 19
Views: 9207

Re: SSD1306 I2C

My Board is a China - clone. The diplay in question is a 1,3", 128x64, connected per I2C. I'm using a breadboard with no other components. Voltage supply via USB. The code: from machine import Pin,I2C import ssd1306 i2c = I2C(scl=Pin(22), sda=Pin(21), freq=100000) lcd = ssd1306.SSD1306_I2C(128,64,i2...
by Swessels
Sat Dec 23, 2017 2:58 pm
Forum: ESP32 boards
Topic: SSD1306 I2C
Replies: 19
Views: 9207

Re: SSD1306 I2C

Thanks for your reply. The display is initialized and accepts commands like 'contrast', 'poweroff' etc. Unfortuneately the display is corrupted. A lot of scattered points and a black bar occurs. In the bar the text commanded with the text() command flashes shortly after sending show(). Additional pu...
by Swessels
Fri Dec 22, 2017 6:29 pm
Forum: ESP32 boards
Topic: SSD1306 I2C
Replies: 19
Views: 9207

SSD1306 I2C

Hi together, i'm new to the ESP32 and it's also my first attempt using micropython. I've some experience with AVR and STM32 using GCC.<br/> I've tried to use a 128x64 ssd1306 OLED display using the follwing library : https://github.com/micropython/micropython/blob/master/drivers/display/ssd1306.py" ...