Actually, sorry, it was correct. Signal on the left, ground on the right.
At the risk of being cheeky, would it be worth connecting the currently NC pin in the Pimoroni connector to an IO pin? Some of their breakouts have an interrupt line on that pin.
STEMMA I2C (2.0mm) connected to Adafruit I2C soil moisture sensor. First reading (0x01 0x61) is baseline, the next (0x3 0xf8) reading is while I touch the sensor (it’s capacitive touch based).
Testing Adafruit Stemma 3P (2.0mm) motor/mosfet driver. When powered the ON LED lights. When signal pin is high, SIG LED lights. Looks good too.
I’m going to do a tad more testing because of some concerns I have about the DDR5 level translator being the same as the Adafruit level translator, but barring any issues this will go into production this week.
I’m having some issues on the DDR5 board that uses the same level shifting circuit as the Stemma boards. Before moving into production we need to do a couple extra tests to be sure this is all going to play well together.
Spotted a ST25DV16 breakout, which is a programmable NFC tag with I2C interface. Don’t know a lot about this one yet, but it seems super cool. I’ll probably have to do a demo of it at some point.
Both boards work great, the voltage high/low levels look good at 3.3 and 5volts.
This look good to go. We’ll start production tomorrow. Thank you so much to everyone for helping to test all the sockets!
Unfortunately the assembler roasted the connectors. The first pass through the reflow oven didn’t melt all the solder, so they cranked up the temperature and ran them again.
We need to check with the supplier and assembler to see how to prevent this on a replacement batch.
Hopefully the next batch is assembled at the end of the week, and these can be available next week.
OK, the connectors got baked at a temperature beyond their rating. I can see the color change on at least the Gravity and Stemma variants as evidence. I don’t see any change in the shape (from the picture).
Q: Is this strictly a cosmetic issue, or are they not salable? (e.g., would that higher temp make the plastic brittle?)
Not sure yet. We use the same vendor for the 9p sh connector on the bus pirate, it has never discolored.
PCBA baked it twice which always browns the previously baked stuff. So that is a factor as well.
Some parts also need a prebake to chase out anything that might discolor the plastic during reflow. That’s what the DDR5 socket vendors said. We have previous experience with this though.
They can be sold, I don’t think the shape is impacted but we want to get you a properly assembled board.
So, the second batch of these also burned during reflow
The connector supplier, who we have worked with for a few years, has offered the following explanation:
We buy Bus Pirate connectors in reels, these are loose parts. The loose parts are lower quality
“Some people don’t mind the yellowing”
We should have told him if we wanted parts that don’t burn in reflow
He’ll sell us better parts and we can do a small batch of 50 to test…
So, on that note, we are buying the connectors from JLC which is fabulously expensive. However, they didn’t burn when we made the initial prototypes. And since this isn’t the PCBA’s fault, we’re also on the hook for 3 assembly runs so the next one has to count.
Sorry this is taking so long, on the other hand this board and the DDR5 adapter should be available at the same time if you want to get both.