Shipping to the US resumed

 Now I finally have resumed shipping to the US!

Changing the subject, this is the keypad rubber of Nanaju:

You may have seen the keypad rubbers of remote controls. Common remote controls use black conductive paint for their switches. But the Nanaju keypad uses metal dome switches. So the keypad rubber don't have black conductive paint.

Conductive paint switch is quite cheap but lacks tactile sensation. Not very durable too. Nanaju keypad has ALPSALPINE SKRRAAE010 as its metal dome switch. ALPSALPINE claims 5,000,000 cycles of operating life.

P2PPCB Compoer F360 Updated (May 2026)

 20260530-v0.2.6:

• Announcement: P2PPCB platform will be abandoned in Jan 2027 if there is no demand.

Now I finished the design work of Nanaju. I no longer need P2PPCB platform. If no one wants to pay for P2PPCB platform, it is not maintainable anymore.

PC keyboard Nanaju is now on sale

 

PC Keyboard Nanaju by DecentKeyboards on Sketchfab

Now it is on sale. Etsy

ESD test

 I have heard a lot of complaints about ESD damages on keyboards. Today TVS diodes work excellently, so we do not hear such complaints nowadays. But ESD is still a severe threat for the product quality. I tested Nanaju prototype by IEC 61000-4-2:2008 standard.

The result is, it passed for level 3 (contact discharge: 6 kV, air discharge: 8 kV), and failed for level 4 in air discharge (15 kV).

I will analyze the failure mode, but I think that the ESD immunity of Nanaju will not become much better. The design does not allow bigger / more components nor larger track gap. Nanaju will not be super tolerant to ESD, sorry.

Corrugated box and cushion

I am working on packing material now. End-user products require packing material. Without dedicated packing material, the shipping cost becomes expensive, and the product can be damaged on its way.

Matrix FPC sample arrived

 

The outline works as expected. Now I am checking the electronic design.

I will try ESD test with this prototype.

Keypad rubber sample arrived

 Nanaju has a keypad on the left side. The material is silicone. I got the sample today:

The printing is a bit rotated. I will fix the problem in the product.

The keypad works as a function keypad if without modifier keys. With Layer key, it works as a PIN pad. We often make it oppositely. But digits appear consecutively in many cases. Function key input does not occur so consecutively. To reduce down/up effort of Layer key, the keypad works as a function keypad if without modifier keys.