Using the Winstar WEH001602E - I broke my OLED module. Temporarily abandoned.

The wiring diagram is probably OK. The display showed "Hello world" along with a lot of other unwanted characters. It might be a software problem.

Data sheet from Picaxe.com - If you buy this from Picaxe, use the display without the serial three wire interface.

Driving the Display - Hello world

• If the RS pin is LOW, transferred data will be treated a command.
• If the RS pin is high, the transferred data will be treated a text character.
• To transfer data, Enable must change from high to low.
• It's easy for the MCU to run too fast for the OLED module.
  • Commands or data should not be sent until the busy flag is clear - Recommended.
  • Or use conservatively specified delays and hope for the best - Easier but it might not work 100% reliably.
  • This example uses the second, less safe approach.