Desk of Ladyada - Proto-buildin' Weekend
This weekend we put together a bunch of prototypes so that we can order PCBs! First up, the PB86 breakouts we designed a few weekends ago came, and they work great, with side-by-side stack-ability. Then, we're redesigning the microlipo charger to have a current-selector switch - a few mistakes were made but they were easy to sort out and get the board tested. Finally, the TCA9548 QT breakout board is also good to go, with a voltage selector switch and all ports working. We're designing the tester for it now and are reminded that it's always good to add test points for making testing fast and easy!
The Great Search - Current-carrying Slide Switch
https://www.digikey.com/short/jdwr22pb
For our TCA9548 QT breakout, we're going to allow switching the QT power and signal between 3 and 5V, so it could be used for level shifting. This means the switch itself will be carrying power - we're not using a separate FET-based switch. It's reasonable for us to expect about 500mA total current among all of the 'client' boards, and we have a 500mA regulator on board to manage that. However, that switch has to be spec'd for the voltages and currents we're expecting to pass through it! It's very easy to glide over contact specs for switches if you're used to signal-only usage, let's find a vertical switch that can handle 5V and up to 500mA total.
Visit the Adafruit shop online - http://www.adafruit.com
-----------------------------------------
LIVE CHAT IS HERE! http://adafru.it/discord
Adafruit on Instagram: https://www.instagram.com/adafruit
Subscribe to Adafruit on YouTube: http://adafru.it/subscribe
New tutorials on the Adafruit Learning System: http://learn.adafruit.com/
-----------------------------------------
#deskofladyada #thegreatsearch #adafruit
This weekend we put together a bunch of prototypes so that we can order PCBs! First up, the PB86 breakouts we designed a few weekends ago came, and they work great, with side-by-side stack-ability. Then, we're redesigning the microlipo charger to have a current-selector switch - a few mistakes were made but they were easy to sort out and get the board tested. Finally, the TCA9548 QT breakout board is also good to go, with a voltage selector switch and all ports working. We're designing the tester for it now and are reminded that it's always good to add test points for making testing fast and easy!
The Great Search - Current-carrying Slide Switch
https://www.digikey.com/short/jdwr22pb
For our TCA9548 QT breakout, we're going to allow switching the QT power and signal between 3 and 5V, so it could be used for level shifting. This means the switch itself will be carrying power - we're not using a separate FET-based switch. It's reasonable for us to expect about 500mA total current among all of the 'client' boards, and we have a 500mA regulator on board to manage that. However, that switch has to be spec'd for the voltages and currents we're expecting to pass through it! It's very easy to glide over contact specs for switches if you're used to signal-only usage, let's find a vertical switch that can handle 5V and up to 500mA total.
Visit the Adafruit shop online - http://www.adafruit.com
-----------------------------------------
LIVE CHAT IS HERE! http://adafru.it/discord
Adafruit on Instagram: https://www.instagram.com/adafruit
Subscribe to Adafruit on YouTube: http://adafru.it/subscribe
New tutorials on the Adafruit Learning System: http://learn.adafruit.com/
-----------------------------------------
#deskofladyada #thegreatsearch #adafruit
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