| Electronics > Beginners |
| Can't get SSD1306 OLED working on custom PCB |
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| Psi:
--- Quote from: MarkF on April 06, 2019, 10:15:05 pm ---May I ask an unrelated question? Are the raw display flex contacts something that can be soldered by hand? I was actually thinking of laying out my own PCB before I ran across this thread. --- End quote --- The metal ends on the flex LED display above can be soldered/unsoldered by hand yes. It's a little more difficult than normal soldering and you have to be careful since it's flex and easier to damage. But yes, if a flex cable has those solder covered pads on the end then they're solderable using an iron. However you cannot cut a flex and then solder it to something. It must have an end that was prepared for soldering with exposed metal on both sides. |
| MarkF:
--- Quote from: Psi on April 06, 2019, 10:34:45 pm --- --- Quote from: MarkF on April 06, 2019, 10:15:05 pm ---May I ask an unrelated question? Are the raw display flex contacts something that can be soldered by hand? I was actually thinking of laying out my own PCB before I ran across this thread. --- End quote --- The metal ends on the flex LED display above can be soldered/unsoldered by hand yes. It's a little more difficult than normal soldering and you have to be careful since it's flex and easier to damage. But yes, if a flex cable has those solder covered pads on the end then they're solderable using an iron. However you cannot cut a flex and then solder it to something. It must have an end that was prepared for soldering with exposed metal on both sides. --- End quote --- Thanks. Just concerned because some of the photos look like the flex comes out to the edge of the pad (i.e. siimilar to a PCB edge connector) and would require wave soldering. |
| Majek Ondrovic:
So I stumbled onto a schematic (see attached) for the pre-made OLEDs with PCB like you find on Amazon or AliExpress. I'm going to change my design to better match this one. I also found another I2C hook-up guide for MCUs that seems to concur with most of the other schematic. What I don't get is this reset circuit-- It has a 10k pull-up but also a diode and a filter cap? If RST/RESET is an input, and not interfacing to the MCU, what's the point of this? |
| Nusa:
RST needs to be held low long enough to be recognized when power is first applied, and then allowed to go high. The capacitor is more than just a filter in this case. |
| Majek Ondrovic:
--- Quote from: Nusa on April 07, 2019, 02:36:16 am ---RST needs to be held low long enough to be recognized when power is first applied, and then allowed to go high. The capacitor is more than just a filter in this case. --- End quote --- Aha! very interesting, thank you. I'm glad I asked |
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