I would like to leave a note to folks also having the problem that the SSD1306 only displays random dots (=garbage). I had this problem on my HELTEC_Wifi_LoRa_32_v3 board banging my head for hours only to finally find and apply this simple fix from @piskernik
To fix one simply has to extend the class initialization with an explicit reset PIN parameter:
# extend ssd1306.py library:
...
class SSD1306_I2C(SSD1306):
def __init__(self, width, height, i2c, addr=0x3C, external_vcc=False, res=None):
self.i2c = i2c
self.addr = addr
self.res = res
self.temp = bytearray(2)
self.write_list = [b"\x40", None] # Co=0, D/C#=1
if res != None: # NEW!
res.init(res.OUT, value=0)
import utime as time
self.res(1)
time.sleep_ms(1)
self.res(0)
time.sleep_ms(10)
self.res(1)
super().__init__(width, height, external_vcc)
...
and then to call it as follows (e.g. pin 21 on Heltec V3, could be pin 16 on other boards):
I would like to leave a note to folks also having the problem that the SSD1306 only displays random dots (=garbage). I had this problem on my HELTEC_Wifi_LoRa_32_v3 board banging my head for hours only to finally find and apply this simple fix from @piskernik
To fix one simply has to extend the class initialization with an explicit reset PIN parameter:
and then to call it as follows (e.g. pin 21 on Heltec V3, could be pin 16 on other boards):
Here you can find more data about pins etc. .