ESP8266 Community Forum

- Mon Dec 19, 2016 7:26 pm #59716 Hi all,

I just bough two Esp-13 board. My plan is to use it in a little project with the espressolite library. So i have used the Arduino Ide to upload the program. Without any problem but..

The i have attached the oled screen to D4 and D5 from the esp13 to the oled Sck, Scl and also connect the display to the powersupply but nothing happoens when i restart the esp.

1-I have grounded the io15 and io0 to flash the device. To normal function, do i have to detach these two points?

2-does the esp-13 needs any special step after uploaded the program?

3-The esp-13 pinout is the same as the wroom-02?

4-I have tried to upload a pacman game on from the espressolite library to the esp13 and using an oled to display the game, but nothing appear on the screen. The pinout is D4 and D5. The i2c code from the display is the standard one but alter flashing. An even reset does no show anything

I hope anyone can solve my questions.

Thanks.

- Mon Dec 19, 2016 11:09 pm #59722 Do you have pull up resistors on the I2C lines? I just checked my oled and it doesn't have them on the module so you need to have them.

I'm not familiar with the ESP-13, but there was some mislabeling of D4 and D5 of some modules early on. Maybe try swapping the connections.

I typically use I2C character LCDs and I wanted to try an oled I got in. I thought the connections was the same as the I2C connections on the LCD. But it was different, the SDA and SCL lines were swapped.

- Tue Dec 20, 2016 7:08 pm #59768 Hi, thanks for reply.

I have followed your recommedations, add two 10k resistor pullups to the sda sdl but still does not work. Im trying to run a game made for ESPresso Lite V2 (Wroom 02) on a ESP-13.

Since it seems that both share the same pinout, what im trying to do is possible? using a example made for Wroom and run it on a ESP-13?

If so, i don't know what can be the problem.

Any tip?

Thanks,