All posts tagged witty

We Now Have Witty Pi 3!

Today we proudly announce our new product: Witty Pi 3, which is the direct descendant of Witty Pi 2, and has more exciting features.

Also, Witty Pi 3 supports the newly released Raspberry Pi 4!

 

 

What’s New?

Witty Pi 3 finally has its own brain: a micro controller (ATtiny841). Thanks to this micro controller, Witty Pi 3 behave much smarter and can detect and process much more complex situation. The firmware for ATtiny84 is developed with Arduino IDE, and is open-source (will be available on GitHub soon). If you don’t mind losing warranty, it is possible to modify Witty Pi 3’s firmware and change its behavior as you wish.

Witty Pi 3 also added an LDO voltage regulator (LM29150) on board, which allows you to power Witty Pi with higher voltage. Now you can directly use 6V or 7.4V battery to power Witty Pi 3 + Raspberry Pi. The 5V micro USB connector is still there, and you can power Witty Pi 3 directly with 5v too.

Besides all those that can be done with Witty Pi 2,  Witty Pi 3 also monitor the input voltage and output current. You can tell Witty Pi 3 to gracefully shutdown your Raspberry Pi when input voltage is lower than certain value; you can also let Witty Pi 3 to wake up your Raspberry Pi when input voltage increase to certain value. All these setting can be done via I2C interface, and Witty Pi 3’s software already takes care of the hard work. You can make a lot of configurations via the software. The software installation is as simple as before, just run two commands:

Price and Where to Buy?

Witty Pi 3’s retail price is 530 CZK (about 20.82EUR  /  18.66GBP  /  23.57USD).

You can buy it directly from our e-shop or you may be able to buy it from our resellers soon.

Can I still get Witty Pi 2?

Yes, but it will be less convenient. Witty Pi 2 is now officially retired and will only be produced on request. We suggest all new customers to choose Witty Pi 3, which has more features and can do anything that Witty Pi 2 can do. I your product is using Witty Pi 2 already, and you don’t want to switch to Witty Pi 3, you can request us to produce some Witty Pi 2 boards for your project.

New Revision of Witty Pi 2

Witty Pi 2 is a HAT-shaped add-on for Raspberry Pi that adds accurate realtime clock (DS3231SN) and power management, which allows you to define complex ON/OFF sequence of your Raspberry Pi with simple script. Witty Pi 2 is one of our flagship product and is becoming more and more popular recently. Today we announce the second revision of Witty Pi 2, which only has slight difference on the look and introduces a small enhancement, yet significantly simplifies our assembly process.

The figure below shows the different look of reversion 1 and reversion 2:

rev1_vs_rev2

Until recent days, both Witty Pi and Witty Pi 2 use a rather complex assembly process. The 40-pin stackable header needs to be soldered manually on the board first, and then a plastic pin holder will be pressed on the board, to make the board look nicer.

40_pin_header_assembly

Soldering the 40-pin stackable header is a huge workload, and we could hardly bear it, as the demand of Witty Pi 2 goes higher. So we take the idea from the Sense HAT, and use a surface-mounted female header to assembly the stackable header.

smd_header

Witty Pi 2 (reversion 2)

 

This SMD female header is customised, and has only 2mm plastic height (the one on Sense HAT has 3.5mm plastic height). This slim header can make sure the stackable header be hold firmly, and still has enough length of pin exposed on top. This female header increases the BOM cost, but it saves us a lot of time on soldering the stackable header.

Although the stackable header is fixed in place, you can still take it away if you wish. By doing so your Witty Pi 2 becomes a very slim board and more suitable for portable project. For example, you can connect it with Raspberry Pi Zero:

with_rpi_zero

In reversion 2, we also made a small enhancement on the design, and prolong the delay time (for 2~4 seconds) before Witty Pi 2 cuts the power. The purpose of this enhancement is to avoid “hard shutdown” unintentionally. This change doesn’t make Witty Pi 2 more NOOBS friendly, since the delay on NOOBS menu is way longer. You will still need to avoid using NOOBS, or disable the NOOBS menu to make Witty Pi 2 work. More details about this issue can be found on page 5 of Witty Pi 2 user manual.

The second revision of Witty Pi 2 is now in stock, and the pricing is the same with the first revision.