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An Arduino ISP connector is used, among others, for burning a bootloader and for programming ATtiny chips. When the ISP connector is only used once for programming, and than never again, it would be more convenient not to use a connector. Therefore, I created the connectorless 1x6 mini ISP connector and the mini 1x6 ISP adapter. By the zigzag positions of the PCB holes, the male ISP connector pins press against the holes and make electrical contact, and so no PCB connector is needed.

Connectorless 1x6 mini ISP without Pogo pins
Connectorless 1x6 mini ISP without Pogo pins

The standard 2.54mm Arduino ISP connector

I am an inventor and always wonder if something cannot be made better or simpler. For instance, the ISP connector, which is 2x3 header with a pitch of 2.54mm:

Standard Arduino 2x3 ISP header
Standard Arduino 2x3 ISP header

To connect to the ISP connector you could use an adapter with Pogo pins:

Sparkfun ISP Pogo adapter
Sparkfun ISP Pogo adapter

But the adapter must be continuously pressed against the PCB during use. Therefore I invented an alternative:

The connectorless zigzag 1x6 mini ISP connector

My solution has some advantages:

  • No Pogo pins needed
  • In contrast to the Pogo adapter, the connector remains plugged in without any help
  • The construction is simple
  • Small footprint since the pitch is 1.27mm
  • Zero ISP connector cost

The construction is simple: By the zigzag positions of the PCB holes, the male connector pins press against the holes and make electrical contact. The connector is self-clamping. The idea is inspired by the Sparkfun 1X06_LOCK Eagle footprint.

Connectorless AVR ISP connector
Connectorless zigzag 1.27mm AVR ISP connector

Mini 1x6 ISP adapter

With the mini 1x6 ISP adapter we can connect the zigzag ISP connector. The connector pins are thin and are suitable for the Eagle footprint. It is made compatible with the connector of the programmer USBasp.

Mini 1x6 ISP adapter
Mini 1x6 ISP adapter
Mini 1x6 ISP adapter for the USBasp
Mini 1x6 ISP adapter for the USBasp

Eagle footprint

You can download the Eagle library part at GitHub.

Mini 1x6 ISP adapter for sale

If there is demand, I can let produce the connector and sell. So tell me if you are interested.

Do you have any comments? Please let me know.
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