MichaelMeissner
Senior Member+
At times I like to use Adafruit Feather wings and I use the Adafruit Teensy 3.2 -> Feather adapter:
And for portable projects like my wooden bowtie with neopixel ring, I like to use the feather adapter even if I'm not using feather wings, because it has a JST-PH 2-pin adapter for a lipo battery, and in fact it will charge the battery while it is being powered by USB. In fact, I can use the on/off pin to turn off power to the Teensy proper, and the feather adapter will still charge the battery. This makes it useful for things like props, where I can take off the prop and set it up with a USB power source to charge the battery overnight. Even though there are other options (such as the onehorse board specifically for the Teensy), I like using the feather adapter, because the JST PH connector is much more firmly attached than soldering a JST PH connector to a breadboard is, and sometimes it is a tight fit to get the battery out. The only downside is the lack of an on/off pin, and the Teensy 4.0 provides one.
Some notes about using the Teensy 4.0 in the feather adapter:
With the Teensy 3.2, there was enough room (0.2") between the Teensy and and the JST-PH connector for 2 rows of pins (2 x 7 pins). The FrankB ConnectorBoard was perfect to bring out the pins on the bottom pads, while maintaining a small size and allowing normal feather wings to be attached.:
So with all of the Teensy 4.0 breakout boards that have been designed, I was wondering if one had been designed specifically to mount a Teensy 4.0 into a feather adapter. I didn't recall any.
My thoughts would be:
And for portable projects like my wooden bowtie with neopixel ring, I like to use the feather adapter even if I'm not using feather wings, because it has a JST-PH 2-pin adapter for a lipo battery, and in fact it will charge the battery while it is being powered by USB. In fact, I can use the on/off pin to turn off power to the Teensy proper, and the feather adapter will still charge the battery. This makes it useful for things like props, where I can take off the prop and set it up with a USB power source to charge the battery overnight. Even though there are other options (such as the onehorse board specifically for the Teensy), I like using the feather adapter, because the JST PH connector is much more firmly attached than soldering a JST PH connector to a breadboard is, and sometimes it is a tight fit to get the battery out. The only downside is the lack of an on/off pin, and the Teensy 4.0 provides one.
Some notes about using the Teensy 4.0 in the feather adapter:
- The Teensy 4.0 does not have a pin for AREF, so you should make sure the pin on the adapter for AREF is wired to 3.3v;
- The Teensy 4.0 does not have a DAT output pin (A14 for the Teensy 3.2), which means if you connect the pin in that position (the on/off pin), you cannot use the first analog pin (but it would allow you to bring out the on/off pin to the feather wings.
- While there are a lot of differences in pin layout between the Teensy 3.2 and 4.0, the pins that the feather adapter cares about (Serial1 0/1, I2C0 18/19, SPI 11/12/13) are the same, so within the limitations of the feather interface, it works fine.
With the Teensy 3.2, there was enough room (0.2") between the Teensy and and the JST-PH connector for 2 rows of pins (2 x 7 pins). The FrankB ConnectorBoard was perfect to bring out the pins on the bottom pads, while maintaining a small size and allowing normal feather wings to be attached.:
So with all of the Teensy 4.0 breakout boards that have been designed, I was wondering if one had been designed specifically to mount a Teensy 4.0 into a feather adapter. I didn't recall any.
My thoughts would be:
- Standard 14 pins on each side;
- Standard 5 pins at the back;
- Connector for VUSB;
- 3.3v connection for AREF ;
- Pad 24 to connect where the 3.2 has A10 (but the feather adapter doesn't really bring out this pin, so we might not need it);
- Pad 25 to connect where the 3.2 has A11 (but the feather adapter doesn't really bring out this pin, so we might not need it);
- Bring out pins 26-33 in two rows behind the Teensy (or bring out 24-33);
- On the right side of the feather adapter, there are 6 pins (A7-A9, 3.3v, ground, VIN) that aren't used in the feather wing (most boards have their lipo adapter there), so we could grow the board by 1 or 2 rows. One row could be the SD pins, and the other row could be the USB out pins.