Anet A8 - Mainboard header

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On my Anet A8’s mainboard there is a header marked “USB BLE”, but I can’t figure out what the pins are.

[url]http://www.anet3d.com/English/Technical_Support/Customer_Service/104.html[/url]

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Can you trace the pins to where they go? Your only option without a schematic is reverse engineering. Can you make out what the processor part number is and work from there?

Assuming the port is USB for plugging in a USB BLE dongle there will be 5V, GND and D+ and D- so you should be able to work it out from this?

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The mainboard probably has some atmega128x/256x so the pins would be RX/TX/VCC/GND for a bluetooth to serial module.

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So I think i found the GND pin. This is going to be a task to figure out.

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I found a version here that you can zoom into. It doesn’t look as straight forward as I thought.

https://www.aliexpress.com/item-img/3D-Printer-Mainboard-Melzi-2-0-ATMEGA1284P-Motherboard-Reprap-1284p-DIY-Control-Board-Support-MK1-MK2A/32621733766.html#

I have a feeling this is actually the ISP programming port for the micro. ??? It could double up as BLE if the module was SPI interface.

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[url]http://lokspace.eu/anet-a8-wifi-mod/[/url]

So this guy managed to get it to interface with wifi, however he didn’t say what the pins were. He removed some resistors and jumper 4 of the pins. He posted a board schematic, so I’ll look at that later.

I soldered in jumpers to the header so that I can probe them with the DSO. More on that story later.

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Ah, he’s using the ISP interface which has the SPI and the J8 is simply to jumper the wires to the correct location.