PYBD-Butterfly-ENG

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Introduction

The "PYBD Butterfly" board allows you to use your MicroPython Pyboard-D (PYBD) and its X-Y positions to facilitate rapid prototyping.

It also allows you to plug sensor and expansion board with popular connectors like:

• Qwiic (SparkFun) / StemmaQT (Adafruit)
• Grove (SeeedStudio)
• UEXT (Olimex) this Universal EXTension is robust ship I2C/SPI/UART and 3.3V/Ground power. A Must.

The Butterfly also offers more GROUND and Power connections. It uses male header for 3.3V points and female connector for GROUND points.

The Butterfly is distributed as a kit.

Schematic

Assembly

	Place the JST-PH (Qwiic/StemmaQT) connector on one of the both dedicated site (on the bask of the board). The both position are wired in parallele on the same I2C bus (so any position are right). As this connector is quite small and more difficult to solder, we will start with its connection pin.
	Put some flux on the board behind de pins. This will help the stain to melt on the pins and the pad.
	Maintain the ronnector right in place while soldering the pins. As the connector is small, the best is to use a tweezers and apply some pressure to avoid the connector to move. Put some solder on the tip of the iron and put it on the pins. Thanks to the flux, the solder will automagically melt quickly on the pads. Next, just make a solder joint on the fixation pads on the front of the connector (near of the board edge).
	Solder the Grove connector is more easy. Place the Grove connector and maintain it right in place with your fingers (this connector is bigger enough). Load the iron tip with some solder and drop off the solder on the connection pin first (solder should easily melt down on the pads and the pins). Once the pin soldered, secure the Grove connector in place by applying solder on the sides of the connector. Repeat the same operations for the second Grove connector.
	Pick up the male connector and split it in 4 sections of 8 pins and 1 section of 3 pins.
	Once the connectors soldered, the board should look like to this picture.
	Pick the 1x3 female connectors and solder them on the board.
	Prepare the 2 sections 1.27mm connector. Cut them with care, they are fragile.
	Place the shorter part of the connector inside the holes of the Butterfly board.
	Place your Pyboard-D on the top of the 1.27mm connectors to maintain a perfect alignment.
	Flip-over the whole assembly. Solder few pins to maintain the connector right in place on the Butterfly.
	Remove the Pyboard-D to avoids accidental solder projection while soldering the 1.27mm connector. Then finish the solder operation on the 1.27mm connector of the Butterfly.
	Prepare and solder the UEXT connector. Please align the UEXT Notch (opening) with the board silkscreen.
	Great! The Butterfly is now assembled.

Option 1: Solder the Pyboard-D on Butterfly

One of the options is to solder the PYBD on the Butterfly.

• The "advantage" is to have a very compacte assembly.
• The "inconvenient" is to definitively associate the PYBD with the Butterfly.

Solder the Pyboard-D on the Butterfly board.

Option 2: Use female connectors

An other option is to solder the 1.27mm female connector on the Pyboard-D.

• The advantage is to allow you to remove the Pyboard-D from the Butterfly.
• The inconvenient of this assembly is to have a ticker solution.

	Flip the Butterfly board. Snap in the female 1.27mm connectors on the Butterfly.
	Gently place the Pyboard-D on the top the of the female connector. Do not force the Pyboard-D on the female connector some components are very close of the connector housing!!!